+# Time between last packet sent and LCP ECHO generation (default 10 seconds)
+#set echo_timeout 10
+# Drop sessions who have not responded within idle_echo_timeout seconds (default 240 seconds)
+#set idle_echo_timeout 240
+# Change this value to no to force generation of LCP ECHO every echo_timeout seconds, even there are activity on the link (default yes)
+set ppp_keepalive yes
+