
Troubleshooting
303509-A Rev 00 C-25
Operation and Troubleshooting Layer 2 Tunnels
Use the log files to troubleshoot your network. The following description focuses
on the LAC and the LNS individually.
Troubleshooting the LAC
In this example, the host ‘vega’ was configured as the syslog host for the LAC, or
5399. The following is a log file of a successful L2TP tunnel and session
establishment between the LAC and LNS.
Mar 16 15:26:08 bay_lac wan_manager[1310]: WAN1 incoming call on channel 19 mapped to det52
Mar 16 15:26:08 bay_lac wan_manager[1310]: WAN1 protocol detect using spb "auto_detect" on
channel 19
Mar 16 15:26:13 bay_lac wan_manager[1310]: WAN1 spb "auto_detect" detected modem on channel
19; rescanning
Mar 16 15:26:13 bay_lac wan_manager[1310]: WAN1 incoming call on channel 19 mapped to asy23
Mar 16 15:26:13 bay_lac wan_manager[1310]: WAN1 rescan on channel 19 matched spb
"auto_select"
Mar 16 15:26:13 bay_lac line_adm[1299]: started init_session_proc on asy23 as PID 1316
Mar 16 15:26:13 bay_lac line_adm[1299]: started callmgmt_start on asy23 as PID 1317
Mar 16 15:26:13 bay_lac line_adm[1299]: started chat on asy23 as PID 1318
Mar 16 15:26:26 bay_lac line_adm[1299]: started callmgmt_chat_update on asy23 as PID 1319
Mar 16 15:26:26 bay_lac line_adm[1299]: started cli on asy23 as PID 1320
Mar 16 15:26:28 bay_lac line_adm[1299]: started ppp on asy23 as PID 1321
Mar 16 15:26:28 bay_lac ppp[1321]: Port-Begin:asy23:PPP:::[local]
Mar 16 15:26:28 bay_lac ppp[1321]: ppp:asy23:ADM Start LCP
Mar 16 15:26:28 bay_lac line_adm[1299]: started init_session_proc on mp1 as PID 1322
Mar 16 15:26:28 bay_lac line_adm[1299]: started callmgmt_dev_start on mp1 as PID 1323
Mar 16 15:26:28 bay_lac line_adm[1299]: started mp on mp1 as PID 1324
Mar 16 15:26:29 bay_lac system[0]: ppp:asy23:detach link from bundle mp1
Mar 16 15:26:29 bay_lac mp[1324]: ppp:mp1:terminating: Success
Mar 16 15:26:29 bay_lac line_adm[1299]: started callmgmt_end on mp1 as PID 1325
Mar 16 15:26:29 bay_lac line_adm[1299]: started cleanup_session_proc on mp1 as PID 1326
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23:LCP Started LCP
Mar 16 15:26:32 bay_lac ppp[1321]: Sent RADIUS Access-Request to 132.245.54.20
Mar 16 15:26:32 bay_lac ppp[1321]: Received RADIUS Access-Accept from 132.245.54.20
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23:l2tp tunnel call connection starting
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23: *** PAP SYSLOG HISTORY ***
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23:: Using Authentication Server to authenticate
remote PAP request
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23:: PAP - L2TP – Tunnel call established -
authentication will be completed by remote node
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23: *** END PAP HISTORY ***
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23:l2tp tunnel call established, forwarding
traffic to remote node
Mar 16 15:26:32 bay_lac ppp[1321]: ppp:asy23:PPP Forward PAP
Mar 16 15:26:34 bay_lac radlog[1376]: Sent RADIUS Accounting-Request to 132.245.54.20
Mar 16 15:26:34 bay_lac radlog[1376]: Received RADIUS Accounting-Response from
132.245.54.20
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