X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/0f22007377e186b9a16839c31156190d378fcffc..12835e031e502885bce44c5e6b59fa12e0564ca0:/Docs/manual.html diff --git a/Docs/manual.html b/Docs/manual.html index a857d9b..8894599 100644 --- a/Docs/manual.html +++ b/Docs/manual.html @@ -56,13 +56,12 @@ H3 {
  • Filtering
  • Clustering
  • Routing
    • -
  • Avoiding Fragmentation
  • Performance

    • Overview

    -l2tpns is half of a complete L2TP implementation. It supports only the -LNS side of the connection.

    +l2tpns a complete L2TP implementation. It supports the LAC, LNS and + PPPOE server.

    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 @@ -185,6 +184,18 @@ the same as the LAC, or authentication will fail. Only actually be used if the LAC requests authentication. +

  • l2tp_mtu (int)
    +MTU of interface for L2TP traffic (default: 1500). Used to set link +MRU and adjust TCP MSS. +
    • + +
  • ppp_restart_time (int)
    +ppp_max_configure (int)
    +ppp_max_failure (int)
    +PPP counter and timer values, as described in §4.1 of +RFC1661. +
    • +
  • primary_dns (ip address)
  • secondary_dns (ip address)
    Whenever a PPP connection is established, DNS servers will be sent to the @@ -229,6 +240,11 @@ A comma separated list of supported RADIUS authentication methods (pap or chap), in order of preference (default pap).
    • +
  • radius_dae_port (short)
    +Port for DAE RADIUS (Packet of Death/Disconnect, Change of Authorization) +requests (default: 3799). +
    • +
  • allow_duplicate_users (boolean)
    Allow multiple logins with the same username. If false (the default), any prior session with the same username will be dropped when a new @@ -236,15 +252,44 @@ session is established.
  • bind_address (ip address)
    -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. +
    • + +
  • iftun_address (ip address)
    +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. +
    • + +
  • bind_multi_address (ip address)
    +This parameter permit to listen several addresss of the l2tp udp protocol +(and set several address to the tun interface). +
    +WHEN this parameter is set, It OVERWRITE the parameters "bind_address" +and "iftun_address". +
    +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). +
    +example of use with 2 address: +
    +set bind_multi_address "64.14.13.41, 64.14.13.42" + +
    • + +
  • tundevicename (string)
    +Name of the tun interface (default: "tun0").
  • peer_address (ip address)
    Address to send to clients as the default gateway. - +
  • send_garp (boolean)
    Determines whether or not to send a gratuitous ARP for the @@ -271,8 +316,13 @@ every connected use will be dumped to a file in this directory. Each file dumped begins with a header, where each line is prefixed by #. Following the header is a single line for every connected user, fields separated by a space.
    The fields are username, ip, qos, -uptxoctets, downrxoctets. The qos field is 1 if a standard user, and -2 if the user is throttled. +uptxoctets, downrxoctets, origin (optional). The qos field is 1 if a standard user, and +2 if the user is throttled. The origin field is dump if account_all_origin is set to true +(origin value: L=LAC data, R=Remote LNS data, P=PPPOE data). +
    • + +
  • account_all_origin (boolean)
    +If set to true, all origin of the usage is dumped to the accounting file (LAC+Remote LNS+PPPOE)(default false).
  • setuid (int)
    @@ -323,6 +373,10 @@ on Clustering for more information. Interface for cluster packets (default: eth0).
    • +
  • cluster_mcast_ttl (int)
    +TTL for multicast packets (default: 1). +
    • +
  • cluster_hb_interval (int)
    Interval in tenths of a second between cluster heartbeat/pings.
    • @@ -337,8 +391,95 @@ from the master. Determines the minumum number of up to date slaves required before the master will drop routes (default: 1). + +
  • echo_timeout (int)
    +Time between last packet sent and LCP ECHO generation +(default: 10 (seconds)). +
    • + +
  • idle_echo_timeout (int)
    +Drop sessions who have not responded within idle_echo_timeout seconds +(default: 240 (seconds)) +
    • + +
  • auth_tunnel_change_addr_src (boolean)
    +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). +
    • + +
  • disable_sending_hello (boolean)
    +Disable l2tp sending HELLO message for Apple compatibility. +Some OS X implementation of l2tp no manage the L2TP "HELLO message". +(default: no). +
    • + +

    LAC configuration

    + + +

    A static REMOTES LNS configuration can be entered by the command:

    +
    setforward MASK IP PORT SECRET
    + +where MASK specifies the mask of users who have forwarded to +remote LNS (ex: "/friendISP@company.com").
    +where IP specifies the IP of the remote LNS (ex: "66.66.66.55").
    +where PORT specifies the L2TP Port of the remote LNS +(Normally should be 1701) (ex: 1701).
    +where SECRET specifies the secret password the remote LNS (ex: mysecret).
    +
    +The static Remote LNS configuration can be used when the friend ISP not +have a proxied Radius.
    +If the proxied Radius is used, It will return the RADIUS attributes:
    + Tunnel-Type: 1 = L2TP
    + Tunnel-Medium-Type: 1 = IPv4
    + Tunnel-Password: 1 = "LESECRETL2TP"
    + Tunnel-Server-Endpoint: 1 = "88.xx.xx.x1"
    + Tunnel-Assignment-Id: 1 = "friendisp_lns1"
    + Tunnel-Type: 2 = L2TP
    + Tunnel-Medium-Type: 2 = IPv4
    + Tunnel-Password: 2 = "LESECRETL2TP"
    + Tunnel-Server-Endpoint: 2 = "88.xx.xx.x2"
    + Tunnel-Assignment-Id: 2 = "friendisp_lns2"
    + +

    PPPOE configuration

    + + + +

    BGP configuration

    +

    BGP routing configuration is entered by the command: The routing configuration section is entered by the command

    router bgp as
    @@ -696,12 +837,15 @@ killall -HUP l2tpns The signals understood are: - +
    +
    SIGHUP
    Reload the config from disk and re-open log file.
    +
    SIGTERM, SIGINT
    Stop process. Tunnels and sessions are not +terminated. This signal should be used to stop l2tpns on a +cluster node where there are other machines to +continue handling traffic.
    +
    SIGQUIT
    Shut down tunnels and sessions, exit process when +complete.
    +

    Throttling

    @@ -814,14 +958,14 @@ supplied structure: some way. - +
    +
    t
    Tunnel +
    s
    Session +
    username +
    password +
    protocol
    0xC023 for PAP, 0xC223 for CHAP +
    continue_auth
    Set to 0 to stop processing authentication modules +
    post_auth @@ -831,16 +975,16 @@ supplied structure: to be accepted. - + allow or disallow authentication +
    protocol
    0xC023 for PAP, 0xC223 for CHAP + packet_rx @@ -849,12 +993,12 @@ supplied structure: seriously slow down the system. - +
    +
    t
    Tunnel +
    s
    Session +
    buf
    The raw packet data +
    len
    The length of buf +
    packet_tx @@ -863,12 +1007,12 @@ supplied structure: seriously slow down the system. - +
    +
    t
    Tunnel +
    s
    Session +
    buf
    The raw packet data +
    len
    The length of buf +
    timer @@ -877,9 +1021,9 @@ supplied structure: you do is reentrant. - +
    +
    time_now
    The current unix timestamp +
    new_session @@ -887,10 +1031,10 @@ supplied structure: session is now ready to handle traffic. - +
    +
    t
    Tunnel +
    s
    Session +
    kill_session @@ -898,10 +1042,10 @@ supplied structure: This may be called multiple times for the same session. - +
    +
    t
    Tunnel +
    s
    Session +
    radius_response @@ -911,12 +1055,24 @@ supplied structure: modules. - +
    +
    t
    Tunnel +
    s
    Session +
    key +
    value +
    + + + radius_reset + This is called whenever a RADIUS CoA request is + received to reset any options to default values before + the new values are applied. + + +
    +
    t
    Tunnel +
    s
    Session +
    control @@ -925,21 +1081,13 @@ supplied structure: required. - +
    +
    iam_master
    Cluster master status +
    argc
    The number of arguments +
    argv
    Arguments +
    response
    Return value: NSCTL_RES_OK or NSCTL_RES_ERR +
    additional
    Extended response text +
    @@ -1031,22 +1179,6 @@ ibgp" for IBGP. If this is not supported by your IOS revision, you can use "maximum-paths" (which works for EBGP) and set as_number to a private value such as 64512.

    -

    Avoiding Fragmentation

    - -Fragmentation of encapsulated return packets to the LAC may be avoided -for TCP sessions by adding a firewall rule to clamps the MSS on -outgoing SYN packets. - -The following is appropriate for interfaces with a typical MTU of -1500: - -
    -iptables -A FORWARD -i tun+ -o eth0 	\
-    -p tcp --tcp-flags SYN,RST SYN	\
-    -m tcpmss --mss 1413:1600		\
-    -j TCPMSS --set-mss 1412
-
    -

    Performance

    Performance is great.