Adding the possibility to listening multiple IP L2TP tunnels.

[l2tpns.git] / Docs / manual.html

diff --git a/Docs/manual.html b/Docs/manual.html
index 59d6dbc..384fe9a 100644 (file)
--- a/Docs/manual.html
+++ b/Docs/manual.html
@@ -52,21 +52,22 @@ H3 {
     <LI><A HREF="#Interception">Interception</A></LI>
     <LI><A HREF="#Authentication">Authentication</A></LI>
     <LI><A HREF="#Plugins">Plugins</A></LI>
     <LI><A HREF="#Interception">Interception</A></LI>
     <LI><A HREF="#Authentication">Authentication</A></LI>
     <LI><A HREF="#Plugins">Plugins</A></LI>

-    <LI><A HREF="#Walled Garden">Walled Garden</A></LI>
+    <LI><A HREF="#WalledGarden">Walled Garden</A></LI>
+    <LI><A HREF="#Filtering">Filtering</A></LI>

     <LI><A HREF="#Clustering">Clustering</A></LI>
     <LI><A HREF="#Routing">Routing</A></LI>
     <LI><A HREF="#Performance">Performance</A></LI>
 </OL>
 
 <H2 ID="Overview">Overview</H2>
     <LI><A HREF="#Clustering">Clustering</A></LI>
     <LI><A HREF="#Routing">Routing</A></LI>
     <LI><A HREF="#Performance">Performance</A></LI>
 </OL>
 
 <H2 ID="Overview">Overview</H2>

-l2tpns is half of a complete L2TP implementation.  It supports only the
-LNS side of the connection.<P>
+l2tpns a complete L2TP implementation. It supports the LAC, LNS and
+ PPPOE server.<P>

 
 L2TP (Layer 2 Tunneling Protocol) is designed to allow any layer 2
 protocol (e.g. Ethernet, PPP) to be tunneled over an IP connection.  l2tpns
 implements PPP over L2TP only.<P>
 
 
 L2TP (Layer 2 Tunneling Protocol) is designed to allow any layer 2
 protocol (e.g. Ethernet, PPP) to be tunneled over an IP connection.  l2tpns
 implements PPP over L2TP only.<P>
 

-There are a couple of other L2TP imlementations, of which <A
+There are a couple of other L2TP implementations, of which <A

 HREF="http://sourceforge.net/projects/l2tpd">l2tpd</A> is probably the
 most popular.  l2tpd also will handle being either end of a tunnel, and
 is a lot more configurable than l2tpns.  However, due to the way it works,
 HREF="http://sourceforge.net/projects/l2tpd">l2tpd</A> is probably the
 most popular.  l2tpd also will handle being either end of a tunnel, and
 is a lot more configurable than l2tpns.  However, due to the way it works,


@@ -183,6 +184,18 @@ the same as the LAC, or authentication will fail.  Only actually be
 used if the LAC requests authentication.
 </LI>
 
 used if the LAC requests authentication.
 </LI>
 

+<LI><B>l2tp_mtu</B> (int)<BR>
+MTU of interface for L2TP traffic (default: 1500).  Used to set link
+MRU and adjust TCP MSS.
+</LI>
+
+<LI><B>ppp_restart_time</B> (int)<BR>
+<B>ppp_max_configure</B> (int)<BR>
+<B>ppp_max_failure</B> (int)<BR>
+PPP counter and timer values, as described in &sect;4.1 of
+<a href="ftp://ftp.rfc-editor.org/in-notes/rfc1661.txt">RFC1661</a>.
+</LI>
+

 <LI><B>primary_dns</B> (ip address)
 <LI><B>secondary_dns</B> (ip address)<BR>
 Whenever a PPP connection is established, DNS servers will be sent to the
 <LI><B>primary_dns</B> (ip address)
 <LI><B>secondary_dns</B> (ip address)<BR>
 Whenever a PPP connection is established, DNS servers will be sent to the


@@ -190,51 +203,93 @@ user, both a primary and a secondary.  If either is set to 0.0.0.0, then that
 one will not be sent.
 </LI>
 
 one will not be sent.
 </LI>
 

-<LI><B>save_state</B> (boolean)<BR>
-When l2tpns receives a STGTERM it will write out its current
-ip_address_pool, session and tunnel tables to disk prior to exiting to
-be re-loaded at startup.  The validity of this data is obviously quite
-short and the intent is to allow an sessions to be retained over a
-software upgrade.
-</LI>
-

 <LI><B>primary_radius</B> (ip address)
 <LI><B>secondary_radius</B> (ip address)<BR>
 <LI><B>primary_radius</B> (ip address)
 <LI><B>secondary_radius</B> (ip address)<BR>

-Sets the radius servers used for both authentication and accounting. 
-If the primary server does not respond, then the secondary radius
-server will be tried.
+Sets the RADIUS servers used for both authentication and accounting. 
+If the primary server does not respond, then the secondary RADIUS
+server will be tried.<br>
+<strong>Note:</strong> in addition to the source IP address and
+identifier, the RADIUS server <strong>must</strong> include the source
+port when detecting duplicates to supress (in order to cope with a
+large number of sessions comming on-line simultaneously l2tpns uses a
+set of udp sockets, each with a seperate identifier).

 </LI>
 
 <LI><B>primary_radius_port</B> (short)
 <LI><B>secondary_radius_port</B> (short)<BR>
 </LI>
 
 <LI><B>primary_radius_port</B> (short)
 <LI><B>secondary_radius_port</B> (short)<BR>

-Sets the authentication ports for the primary and secondary radius
+Sets the authentication ports for the primary and secondary RADIUS

 servers.  The accounting port is one more than the authentication
 servers.  The accounting port is one more than the authentication

-port.  If no radius ports are given, the authentication port defaults
+port.  If no RADIUS ports are given, the authentication port defaults

 to 1645, and the accounting port to 1646.
 </LI>
 
 <LI><B>radius_accounting</B> (boolean)<BR>
 to 1645, and the accounting port to 1646.
 </LI>
 
 <LI><B>radius_accounting</B> (boolean)<BR>

-If set to true, then radius accounting packets will be sent.  This
+If set to true, then RADIUS accounting packets will be sent.  This

 means that a Start record will be sent when the session is
 successfully authenticated, and a Stop record will be sent when the
 session is closed.
 </LI>
 
 <LI><B>radius_secret</B> (string)<BR>
 means that a Start record will be sent when the session is
 successfully authenticated, and a Stop record will be sent when the
 session is closed.
 </LI>
 
 <LI><B>radius_secret</B> (string)<BR>

-This secret will be used in all radius queries.  If this is not set then
-radius queries will fail.
+This secret will be used in all RADIUS queries.  If this is not set then
+RADIUS queries will fail.
+</LI>
+
+<LI><B>radius_authtypes</B> (string)</BR>
+A comma separated list of supported RADIUS authentication methods
+(<B>pap</B> or <B>chap</B>), in order of preference (default <B>pap</B>).
+</LI>
+
+<LI><B>radius_dae_port</B> (short)<BR>
+Port for DAE RADIUS (Packet of Death/Disconnect, Change of Authorization)
+requests (default: <B>3799</B>).
+</LI>
+
+<LI><B>allow_duplicate_users</B> (boolean)</BR>
+Allow multiple logins with the same username.  If false (the default),
+any prior session with the same username will be dropped when a new
+session is established.

 </LI>
 
 <LI><B>bind_address</B> (ip address)<BR>
 </LI>
 
 <LI><B>bind_address</B> (ip address)<BR>

-When the tun interface is created, it is assigned the address
-specified here.  If no address is given, 1.1.1.1 is used.  Packets
-containing user traffic should be routed via this address if given,
-otherwise the primary address of the machine.
+It's the listen address of the l2tp udp protocol sent and received
+to LAC. This address is also assigned to the tun interface if no
+iftun_address is specified. Packets containing user traffic should be
+routed via this address if given, otherwise the primary address of the
+machine.
+</LI>
+
+<LI><B>iftun_address</B> (ip address)<BR>
+This parameter is used when you want a tun interface address different
+from the address of "bind_address" (For use in cases of specific configuration).
+If no address is given to iftun_address and bind_address, 1.1.1.1 is used.
+</LI>
+
+<LI><B>bind_multi_address</B> (ip address)<BR>
+This parameter permit to listen several addresss of the l2tp udp protocol
+(and set several address to the tun interface).
+<BR>
+WHEN this parameter is set, It OVERWRITE the parameters "bind_address"
+and "iftun_address".
+<BR>
+these can be interesting when you want do load-balancing in cluster mode
+of the uploaded from the LAC. For example you can set a bgp.prepend(MY_AS)
+for Address1 on LNS1 and a bgp.prepend(MY_AS) for Address2 on LNS2
+(see BGP AS-path prepending).
+<BR>
+example of use with 2 address:
+<BR>
+set bind_multi_address "64.14.13.41, 64.14.13.42"
+
+</LI>
+
+<LI><B>tundevicename</B> (string)<BR>
+Name of the tun interface (default: "tun0").

 </LI>
 
 <LI><B>peer_address</B> (ip address)<BR>
 Address to send to clients as the default gateway.
 </LI>
 
 <LI><B>peer_address</B> (ip address)<BR>
 Address to send to clients as the default gateway.

-</L1>
+</LI>

 
 <LI><B>send_garp</B> (boolean)<BR>
 Determines whether or not to send a gratuitous ARP for the
 
 <LI><B>send_garp</B> (boolean)<BR>
 Determines whether or not to send a gratuitous ARP for the


@@ -276,10 +331,6 @@ second.  Even if this is disabled, you can see this information by running
 the <EM>uptime</EM> command on the CLI.
 </LI>
 
 the <EM>uptime</EM> command on the CLI.
 </LI>
 

-<LI><B>cleanup_interval</B> (int)<BR>
-Interval between regular cleanups (in seconds).
-</LI>
-

 <LI><B>multi_read_count</B> (int)<BR>
 Number of packets to read off each of the UDP and TUN fds when
 returned as readable by select (default:  10).  Avoids incurring the
 <LI><B>multi_read_count</B> (int)<BR>
 Number of packets to read off each of the UDP and TUN fds when
 returned as readable by select (default:  10).  Avoids incurring the


@@ -301,6 +352,13 @@ Keep all pages mapped by the l2tpns process in memory.
 Maximum number of host unreachable ICMP packets to send per second.
 </LI>
 
 Maximum number of host unreachable ICMP packets to send per second.
 </LI>
 

+<LI><B>packet_limit</B> (int><BR>
+Maximum number of packets of downstream traffic to be handled each
+tenth of a second per session.  If zero, no limit is applied (default: 
+0).  Intended as a DoS prevention mechanism and not a general
+throttling control (packets are dropped, not queued).
+</LI>
+

 <LI><B>cluster_address</B> (ip address)<BR>
 Multicast cluster address (default:  239.192.13.13).  See the section
 on <A HREF="#Clustering">Clustering</A> for more information.
 <LI><B>cluster_address</B> (ip address)<BR>
 Multicast cluster address (default:  239.192.13.13).  See the section
 on <A HREF="#Clustering">Clustering</A> for more information.


@@ -310,6 +368,10 @@ on <A HREF="#Clustering">Clustering</A> for more information.
 Interface for cluster packets (default: eth0).
 </LI>
 
 Interface for cluster packets (default: eth0).
 </LI>
 

+<LI><B>cluster_mcast_ttl</B> (int)<BR>
+TTL for multicast packets (default: 1).
+</LI>
+

 <LI><B>cluster_hb_interval</B> (int)<BR>
 Interval in tenths of a second between cluster heartbeat/pings.
 </LI>
 <LI><B>cluster_hb_interval</B> (int)<BR>
 Interval in tenths of a second between cluster heartbeat/pings.
 </LI>


@@ -319,8 +381,95 @@ Cluster heartbeat timeout in tenths of a second.  A new master will be
 elected when this interval has been passed without seeing a heartbeat
 from the master.
 </LI>
 elected when this interval has been passed without seeing a heartbeat
 from the master.
 </LI>

+
+<LI><B>cluster_master_min_adv</B> (int)<BR>
+Determines the minumum number of up to date slaves required before the
+master will drop routes (default: 1).
+</LI>
+
+<LI><B>echo_timeout</B> (int)<BR>
+Time between last packet sent and LCP ECHO generation
+(default: 10 (seconds)).
+</LI>
+
+<LI><B>idle_echo_timeout</B> (int)<BR>
+Drop sessions who have not responded within idle_echo_timeout seconds
+(default: 240 (seconds))
+</LI>
+
+<LI><B>auth_tunnel_change_addr_src</B> (boolean)<BR>
+This parameter authorize to change the source IP of the tunnels l2tp.
+This parameter can be used when the remotes BAS/LAC are l2tpns server
+configured in cluster mode, but that the interface to remote LNS are
+not clustered (the tunnel can be coming from different source IP)
+(default: no).
+</LI>
+
+<LI><B>disable_sending_hello</B> (boolean)<BR>
+Disable l2tp sending HELLO message for Apple compatibility.
+Some OS X implementation of l2tp no manage the L2TP "HELLO message".
+(default: no).
+</LI>
+
+</UL>
+
+<P><U><B>LAC configuration</B></U></P>
+<UL>
+<LI><B>bind_address_remotelns</B> (ip address)<BR>
+Address of the interface to listen the remote LNS tunnels.
+If no address is given, all interfaces are listened (Any Address).
+</LI>
+
+<LI><B>bind_portremotelns</B> (short)<BR>
+Port to bind for the Remote LNS (default: 65432).
+</LI>
+
+</UL>
+
+<P>A static REMOTES LNS configuration can be entered by the command:</P>
+<DL> <DD><B>setforward</B> <I>MASK</I> <I>IP</I> <I>PORT</I> <I>SECRET</I> </DL>
+
+where <I>MASK</I> specifies the mask of users who have forwarded to
+remote LNS (ex: "/friendISP@company.com").</BR>
+where <I>IP</I> specifies the IP of the  remote LNS (ex: "66.66.66.55").</BR>
+where <I>PORT</I> specifies the L2TP Port of the remote LNS
+(Normally should be 1701) (ex: 1701).</BR>
+where <I>SECRET</I> specifies the secret password the remote LNS (ex: mysecret).</BR>
+</BR>
+The static Remote LNS configuration can be used when the friend ISP not 
+have a proxied Radius.</BR>
+If the proxied Radius is used, It will return the RADIUS attributes:</BR>
+       Tunnel-Type: 1 = L2TP</BR>
+       Tunnel-Medium-Type: 1 = IPv4</BR>
+       Tunnel-Password: 1 = "LESECRETL2TP"</BR>
+       Tunnel-Server-Endpoint: 1 = "88.xx.xx.x1"</BR>
+       Tunnel-Assignment-Id: 1 = "friendisp_lns1"</BR>
+       Tunnel-Type: 2 = L2TP</BR>
+       Tunnel-Medium-Type: 2 = IPv4</BR>
+       Tunnel-Password: 2 = "LESECRETL2TP"</BR>
+       Tunnel-Server-Endpoint: 2 = "88.xx.xx.x2"</BR>
+       Tunnel-Assignment-Id: 2 = "friendisp_lns2"</BR>    
+
+<P><U><B>PPPOE configuration</B></U></P>
+
+<UL>
+<LI><B>pppoe_if_to_bind</B> (string)<BR>
+PPPOE server interface to bind (ex: "eth0.12"), If not specified the server PPPOE is not enabled.
+For the pppoe clustering, all the interfaces PPPOE of the clusters must use the same HW address (MAC address).
+</LI>
+
+<LI><B>pppoe_service_name</B> (string)<BR>
+PPPOE service name (default: NULL).
+</LI>
+
+<LI><B>pppoe_ac_name</B> (string)<BR>
+PPPOE  access concentrator name (default: "l2tpns-pppoe").
+</LI>
+

 </UL>
 
 </UL>
 

+<P><U><B>BGP configuration</B></U></P>
+

 <P>BGP routing configuration is entered by the command:
 The routing configuration section is entered by the command
 <DL><DD><B>router bgp</B> <I>as</I></DL>
 <P>BGP routing configuration is entered by the command:
 The routing configuration section is entered by the command
 <DL><DD><B>router bgp</B> <I>as</I></DL>


@@ -338,6 +487,42 @@ Where <I>peer</I> specifies the BGP neighbour as either a hostname or
 IP address, <I>as</I> is the remote AS number and <I>keepalive</I>,
 <I>hold</I> are the timer values in seconds.
 
 IP address, <I>as</I> is the remote AS number and <I>keepalive</I>,
 <I>hold</I> are the timer values in seconds.
 

+<P>Named access-lists are configured using one of the commands:
+<DL>
+  <DD><B>ip access-list standard</B> <I>name</I>
+  <DD><B>ip access-list extended</B> <I>name</I>
+</DL>
+
+<P>Subsequent lines prefixed with <B>permit</B> or <B>deny</B>
+define the body of the access-list.  Standard access-list syntax:
+<DL>
+  <DD>{<B>permit</B>|<B>deny</B>}
+    {<I>host</I>|<I>source source-wildcard</I>|<B>any</B>}
+    [{<I>host</I>|<I>destination destination-wildcard</I>|<B>any</B>}]
+</DL>
+
+Extended access-lists:
+
+<DIV STYLE="margin-left: 4em; text-indent: -2em">
+  <P>{<B>permit</B>|<B>deny</B>} <B>ip</B>
+    {<I>host</I>|<I>source source-wildcard</I>|<B>any</B>}
+    {<I>host</I>|<I>destination destination-wildcard</I>|<B>any</B>} [<B>fragments</B>]
+  <P>{<B>permit</B>|<B>deny</B>} <B>udp</B>
+    {<I>host</I>|<I>source source-wildcard</I>|<B>any</B>}
+       [{<B>eq</B>|<B>neq</B>|<B>gt</B>|<B>lt</B>} <I>port</I>|<B>range</B> <I>from</I> <I>to</I>]
+    {<I>host</I>|<I>destination destination-wildcard</I>|<B>any</B>}
+       [{<B>eq</B>|<B>neq</B>|<B>gt</B>|<B>lt</B>} <I>port</I>|<B>range</B> <I>from</I> <I>to</I>]
+       [<B>fragments</B>]
+  <P>{<B>permit</B>|<B>deny</B>} <B>tcp</B>
+    {<I>host</I>|<I>source source-wildcard</I>|<B>any</B>}
+       [{<B>eq</B>|<B>neq</B>|<B>gt</B>|<B>lt</B>} <I>port</I>|<B>range</B> <I>from</I> <I>to</I>]
+    {<I>host</I>|<I>destination destination-wildcard</I>|<B>any</B>}
+       [{<B>eq</B>|<B>neq</B>|<B>gt</B>|<B>lt</B>} <I>port</I>|<B>range</B> <I>from</I> <I>to</I>]
+       [{<B>established</B>|{<B>match-any</B>|<B>match-all</B>}
+           {<B>+</B>|<B>-</B>}{<B>fin</B>|<B>syn</B>|<B>rst</B>|<B>psh</B>|<B>ack</B>|<B>urg</B>}
+           ...|<B>fragments</B>]
+</DIV>
+

 <H3 ID="users">users</H3>
 
 Usernames and passwords for the command-line interface are stored in
 <H3 ID="users">users</H3>
 
 Usernames and passwords for the command-line interface are stored in


@@ -500,19 +685,19 @@ IP Address      Used  Session User
 </LI>
 
 <LI><B>show radius</B><BR>
 </LI>
 
 <LI><B>show radius</B><BR>

-Show a summary of the in-use radius sessions.  This list should not be very
-long, as radius sessions should be cleaned up as soon as they are used.  The
+Show a summary of the in-use RADIUS sessions.  This list should not be very
+long, as RADIUS sessions should be cleaned up as soon as they are used.  The

 columns listed are:
 <TABLE>
 columns listed are:
 <TABLE>

-       <TR><TD><B>Radius</B></TD><TD>The ID of the radius request.  This is
-       sent in the packet to the radius server for identification.</TD></TR>
+       <TR><TD><B>Radius</B></TD><TD>The ID of the RADIUS request.  This is
+       sent in the packet to the RADIUS server for identification.</TD></TR>

        <TR><TD><B>State</B></TD><TD>The state of the request - WAIT, CHAP,
        AUTH, IPCP, START, STOP, NULL.</TD></TR>
        <TR><TD><B>State</B></TD><TD>The state of the request - WAIT, CHAP,
        AUTH, IPCP, START, STOP, NULL.</TD></TR>

-       <TR><TD><B>Session</B></TD><TD>The session ID that this radius
+       <TR><TD><B>Session</B></TD><TD>The session ID that this RADIUS

        request is associated with</TD></TR>
        <TR><TD><B>Retry</B></TD><TD>If a response does not appear to the
        request, it will retry at this time.  This is a unix timestamp.</TD></TR>
        request is associated with</TD></TR>
        <TR><TD><B>Retry</B></TD><TD>If a response does not appear to the
        request, it will retry at this time.  This is a unix timestamp.</TD></TR>

-       <TR><TD><B>Try</B></TD><TD>Retry count.  The radius request is
+       <TR><TD><B>Try</B></TD><TD>Retry count.  The RADIUS request is

        discarded after 3 retries.</TD></TR>
 </TABLE>
 <P>
        discarded after 3 retries.</TD></TR>
 </TABLE>
 <P>


@@ -553,7 +738,7 @@ current session for that username will be forwarded to the given
 host/port.  Specify <EM>no snoop username</EM> to disable interception
 for the session.<P>
 
 host/port.  Specify <EM>no snoop username</EM> to disable interception
 for the session.<P>
 

-If you want interception to be permanent, you will have to modify the radius
+If you want interception to be permanent, you will have to modify the RADIUS

 response for the user.  See <A HREF="#Interception">Interception</A>.
 <P>
 </LI>
 response for the user.  See <A HREF="#Interception">Interception</A>.
 <P>
 </LI>


@@ -564,7 +749,7 @@ session.  Specify <EM>no throttle username</EM> to disable throttling
 for the current session.<P>
 
 If you want throttling to be permanent, you will have to modify the
 for the current session.<P>
 
 If you want throttling to be permanent, you will have to modify the

-radius response for the user.  See <A HREF="#THrottling">Throttling</A>.
+RADIUS response for the user.  See <A HREF="#Throttling">Throttling</A>.

 <P>
 </LI>
 
 <P>
 </LI>
 


@@ -642,16 +827,15 @@ killall -HUP l2tpns
 </PRE>
 
 The signals understood are:
 </PRE>
 
 The signals understood are:

-<UL>
-<LI>SIGHUP - Reload the config from disk and re-open log file<P></LI>
-<LI>SIGTERM / SIGINT - Shut down for a restart.  This will dump the current
-state to disk (if <EM>save_state</EM> is set to true).  Upon restart, the
-process will read this saved state to resume active sessions.<P>
-<LI>SIGQUIT - Shut down cleanly.  This will send a disconnect message for
-every active session and tunnel before shutting down.  This is a good idea
-when upgrading the code, as no sessions will be left with the remote end
-thinking they are open.</LI>
-</UL>
+<DL>
+<DT>SIGHUP</DT><DD>Reload the config from disk and re-open log file.</DD>
+<DT>SIGTERM, SIGINT</DT><DD>Stop process.  Tunnels and sessions are not
+terminated.  This signal should be used to stop l2tpns on a
+<A HREF="#Clustering">cluster node</A> where there are other machines to
+continue handling traffic.</DD>
+<DT>SIGQUIT</DT><DD>Shut down tunnels and sessions, exit process when
+complete.</DD>
+</DL>

 
 <H2 ID="Throttling">Throttling</H2>
 
 
 <H2 ID="Throttling">Throttling</H2>
 


@@ -660,7 +844,7 @@ desire.  You must first enable the global setting <EM>throttle_speed</EM>
 before this will be activated.<P>
 
 If you wish a session to be throttled permanently, you should set the
 before this will be activated.<P>
 
 If you wish a session to be throttled permanently, you should set the

-Vendor-Specific radius value <B>Cisco-Avpair="throttle=yes"</B>, which
+Vendor-Specific RADIUS value <B>Cisco-Avpair="throttle=yes"</B>, which

 will be handled by the <EM>autothrottle</EM> module.<P>
 
 Otherwise, you can enable and disable throttling an active session using
 will be handled by the <EM>autothrottle</EM> module.<P>
 
 Otherwise, you can enable and disable throttling an active session using


@@ -684,7 +868,7 @@ and <EM>no snoop username</EM> CLI commands.  These will enable interception
 immediately.<P>
 
 If you wish the user to be intercepted whenever they reconnect, you will
 immediately.<P>
 
 If you wish the user to be intercepted whenever they reconnect, you will

-need to modify the radius response to include the Vendor-Specific value
+need to modify the RADIUS response to include the Vendor-Specific value

 <B>Cisco-Avpair="intercept=yes"</B>.  For this feature to be enabled,
 you need to have the <EM>autosnoop</EM> module loaded.<P>
 
 <B>Cisco-Avpair="intercept=yes"</B>.  For this feature to be enabled,
 you need to have the <EM>autosnoop</EM> module loaded.<P>
 


@@ -694,11 +878,11 @@ Whenever a session connects, it is not fully set up until authentication is
 completed.  The remote end must send a PPP CHAP or PPP PAP authentication
 request to l2tpns.<P>
 
 completed.  The remote end must send a PPP CHAP or PPP PAP authentication
 request to l2tpns.<P>
 

-This request is sent to the radius server, which will hopefully respond with
+This request is sent to the RADIUS server, which will hopefully respond with

 Auth-Accept or Auth-Reject.<P>
 
 If Auth-Accept is received, the session is set up and an IP address is
 Auth-Accept or Auth-Reject.<P>
 
 If Auth-Accept is received, the session is set up and an IP address is

-assigned.  The radius server can include a Framed-IP-Address field in the
+assigned.  The RADIUS server can include a Framed-IP-Address field in the

 reply, and that address will be assigned to the client.  It can also include
 specific DNS servers, and a Framed-Route if that is required.<P>
 
 reply, and that address will be assigned to the client.  It can also include
 specific DNS servers, and a Framed-Route if that is required.<P>
 


@@ -708,7 +892,7 @@ walled garden module is loaded, in which case the user still receives the
 PPP AUTHACK, but their session is flagged as being a garden'd user, and they
 should not receive any service.<P>
 
 PPP AUTHACK, but their session is flagged as being a garden'd user, and they
 should not receive any service.<P>
 

-The radius reply can also contain a Vendor-Specific attribute called
+The RADIUS reply can also contain a Vendor-Specific attribute called

 Cisco-Avpair.  This field is a freeform text field that most Cisco
 devices understand to contain configuration instructions for the session.  In
 the case of l2tpns it is expected to be of the form
 Cisco-Avpair.  This field is a freeform text field that most Cisco
 devices understand to contain configuration instructions for the session.  In
 the case of l2tpns it is expected to be of the form


@@ -758,39 +942,39 @@ supplied structure:
 <TABLE CELLSPACING=1 CELLPADDING=3>
        <TR BGCOLOR=LIGHTGREEN><TH><B>Event</B></TH><TH><B>Description</B></TH><TH><B>Parameters</B></TH></TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>pre_auth</B></TD>
 <TABLE CELLSPACING=1 CELLPADDING=3>
        <TR BGCOLOR=LIGHTGREEN><TH><B>Event</B></TH><TH><B>Description</B></TH><TH><B>Parameters</B></TH></TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>pre_auth</B></TD>

-               <TD>This is called after a radius response has been
+               <TD>This is called after a RADIUS response has been

                received, but before it has been processed by the
                code.  This will allow you to modify the response in
                some way.
                </TD>
                <TD>
                received, but before it has been processed by the
                code.  This will allow you to modify the response in
                some way.
                </TD>
                <TD>

-               <UL>
-                       <LI>t - Tunnel ID</LI>
-                       <LI>s - Session ID</LI>
-                       <LI>username</LI>
-                       <LI>password</LI>
-                       <LI>protocol (0xC023 for PAP, 0xC223 for CHAP)</LI>
-                       <LI>continue_auth - Set to 0 to stop processing authentication modules</LI>
-               </UL>
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+                       <DT>username
+                       <DT>password
+                       <DT>protocol<DD>0xC023 for PAP, 0xC223 for CHAP
+                       <DT>continue_auth<DD>Set to 0 to stop processing authentication modules
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>post_auth</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>post_auth</B></TD>

-               <TD>This is called after a radius response has been
+               <TD>This is called after a RADIUS response has been

                received, and the basic checks have been performed.  This
                is what the garden module uses to force authentication
                to be accepted.
                </TD>
                <TD>
                received, and the basic checks have been performed.  This
                is what the garden module uses to force authentication
                to be accepted.
                </TD>
                <TD>

-               <UL>
-                       <LI>t - Tunnel ID</LI>
-                       <LI>s - Session ID</LI>
-                       <LI>username</LI>
-                       <LI>auth_allowed - This is already set to true or
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+                       <DT>username
+                       <DT>auth_allowed<DD>This is already set to true or

                        false depending on whether authentication has been
                        allowed so far.  You can set this to 1 or 0 to force
                        false depending on whether authentication has been
                        allowed so far.  You can set this to 1 or 0 to force

-                       allow or disallow authentication</LI>
-                       <LI>protocol (0xC023 for PAP, 0xC223 for CHAP)</LI>
-               </UL>
+                       allow or disallow authentication
+                       <DT>protocol<DD>0xC023 for PAP, 0xC223 for CHAP
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>packet_rx</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>packet_rx</B></TD>


@@ -799,12 +983,12 @@ supplied structure:
                seriously slow down the system.</FONT>
                </TD>
                <TD>
                seriously slow down the system.</FONT>
                </TD>
                <TD>

-               <UL>
-                       <LI>t - Tunnel ID</LI>
-                       <LI>s - Session ID</LI>
-                       <LI>buf - The raw packet data</LI>
-                       <LI>len - The length of buf</LI>
-               </UL>
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+                       <DT>buf<DD>The raw packet data
+                       <DT>len<DD>The length of buf
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>packet_tx</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>packet_tx</B></TD>


@@ -813,12 +997,12 @@ supplied structure:
                seriously slow down the system.</FONT>
                </TD>
                <TD>
                seriously slow down the system.</FONT>
                </TD>
                <TD>

-               <UL>
-                       <LI>t - Tunnel ID</LI>
-                       <LI>s - Session ID</LI>
-                       <LI>buf - The raw packet data</LI>
-                       <LI>len - The length of buf</LI>
-               </UL>
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+                       <DT>buf<DD>The raw packet data
+                       <DT>len<DD>The length of buf
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>timer</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>timer</B></TD>


@@ -827,9 +1011,9 @@ supplied structure:
                you do is reentrant.
                </TD>
                <TD>
                you do is reentrant.
                </TD>
                <TD>

-               <UL>
-                       <LI>time_now - The current unix timestamp</LI>
-               </UL>
+               <DL>
+                       <DT>time_now<DD>The current unix timestamp
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>new_session</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>new_session</B></TD>


@@ -837,10 +1021,10 @@ supplied structure:
                session is now ready to handle traffic.
                </TD>
                <TD>
                session is now ready to handle traffic.
                </TD>
                <TD>

-               <UL>
-                       <LI>t - Tunnel ID</LI>
-                       <LI>s - Session ID</LI>
-               </UL>
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>kill_session</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>kill_session</B></TD>


@@ -848,25 +1032,37 @@ supplied structure:
                This may be called multiple times for the same session.
                </TD>
                <TD>
                This may be called multiple times for the same session.
                </TD>
                <TD>

-               <UL>
-                       <LI>t - Tunnel ID</LI>
-                       <LI>s - Session ID</LI>
-               </UL>
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>radius_response</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>radius_response</B></TD>

-               <TD>This is called whenever a radius response includes a
+               <TD>This is called whenever a RADIUS response includes a

                Cisco-Avpair value.  The value is split up into
                <EM>key=value</EM> pairs, and each is processed through all
                modules.
                </TD>
                <TD>
                Cisco-Avpair value.  The value is split up into
                <EM>key=value</EM> pairs, and each is processed through all
                modules.
                </TD>
                <TD>

-               <UL>
-                       <LI>t - Tunnel ID</LI>
-                       <LI>s - Session ID</LI>
-                       <LI>key</LI>
-                       <LI>value</LI>
-               </UL>
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+                       <DT>key
+                       <DT>value
+               </DL>
+               </TD>
+       </TR>
+       <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>radius_reset</B></TD>
+               <TD>This is called whenever a RADIUS CoA request is
+               received to reset any options to default values before
+               the new values are applied.
+               </TD>
+               <TD>
+               <DL>
+                       <DT>t<DD>Tunnel
+                       <DT>s<DD>Session
+               </DL>

                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>control</B></TD>
                </TD>
        </TR>
        <TR VALIGN=TOP BGCOLOR=WHITE><TD><B>control</B></TD>


@@ -875,21 +1071,13 @@ supplied structure:
                required.
                </TD>
                <TD>
                required.
                </TD>
                <TD>

-               <UL>
-                       <LI>buf - The raw packet data</LI>
-                       <LI>l - The raw packet data length</LI>
-                       <LI>source_ip - Where the request came from</LI>
-                       <LI>source_port - Where the request came from</LI>
-                       <LI>response - Allocate a buffer and put your response in here</LI>
-                       <LI>response_length - Length of response</LI>
-                       <LI>send_response - true or false whether a response
-                       should be sent.  If you set this to true, you must
-                       allocate a response buffer.</LI>
-                       <LI>type - Type of request (see nsctl.c)</LI>
-                       <LI>id - ID of request</LI>
-                       <LI>data - I'm really not sure</LI>
-                       <LI>data_length - Length of data</LI>
-               </UL>
+               <DL>
+                       <DT>iam_master<DD>Cluster master status
+                       <DT>argc<DD>The number of arguments
+                       <DT>argv<DD>Arguments
+                       <DT>response<DD>Return value: NSCTL_RES_OK or NSCTL_RES_ERR
+                       <DT>additional<DD>Extended response text
+               </DL>

                </TD>
        </TR>
 </TABLE>
                </TD>
        </TR>
 </TABLE>


@@ -901,7 +1089,7 @@ Walled Garden is implemented so that you can provide perhaps limited service
 to sessions that incorrectly authenticate.<P>
 
 Whenever a session provides incorrect authentication, and the
 to sessions that incorrectly authenticate.<P>
 
 Whenever a session provides incorrect authentication, and the

-radius server responds with Auth-Reject, the walled garden module
+RADIUS server responds with Auth-Reject, the walled garden module

 (if loaded) will force authentication to succeed, but set the flag
 <EM>garden</EM> in the session structure, and adds an iptables rule to
 the <B>garden_users</B> chain to force all packets for the session's IP
 (if loaded) will force authentication to succeed, but set the flag
 <EM>garden</EM> in the session structure, and adds an iptables rule to
 the <B>garden_users</B> chain to force all packets for the session's IP


@@ -926,6 +1114,14 @@ command:
 iptables -t nat -L garden -nvx
 </PRE>
 
 iptables -t nat -L garden -nvx
 </PRE>
 

+<H2 ID="Filtering">Filtering</H2>
+
+Sessions may be filtered by specifying <B>Filter-Id</B> attributes in
+the RADIUS reply.  <I>filter</I>.<B>in</B> specifies that the named
+access-list <I>filter</I> should be applied to traffic from the
+customer, <I>filter</I>.<B>out</B> specifies a list for traffic to the
+customer.
+

 <H2 ID="Clustering">Clustering</H2>
 
 An l2tpns cluster consists of of one* or more servers configured with
 <H2 ID="Clustering">Clustering</H2>
 
 An l2tpns cluster consists of of one* or more servers configured with