
Troubleshooting
303509-A Rev 00 C-31
Listing the IP circuits configured on the box shows the entry that corresponds with
the assigned network.
[2:1]$
show ip circ
Circuit Circuit # State IP Address Mask
-------- ----------- -------- ---------------- ----------------
None 65534 Up 10.10.10.254 255.255.255.0
E21 1 Up 10.250.20.1 255.255.255.0
S31 2 Up 132.245.56.6 255.255.255.252
3 circuit(s) found
If the dial-in user is not able to establish a connection to the home network, first
ensure that there is connectivity between LNS and LAC. Then use the following
table to isolate the failure from the LNS’s perspective.
Troubleshooting the BSAC RADIUS Server
The BSAC RADIUS server maintains an activity log and an accounting log. The
following logs were taken from the BSAC RADIUS server located at the home
network. They reflect the case where a user dials in and successfully connect, and
then disconnects.
Activity Log
03/16/1998 15:36:31 Sent accept response for user
[email protected] to client LNS_LABNOTE
03/16/1998 15:36:31 Sending accounting response
03/16/1998 16:08:24 Sending accounting response
Event What to Check
LNS and LAC create Tunnel, if one doesn’t
already exist
LNS Log File, show l2tp tunnels, check
wfL2TPTunnelInfoEntry MIB.
LNS and LAC establish session LNS Log File, show l2tp sessions, check
wfL2TPSessionInfoEntry
RADIUS client in LNS sends authentication
request to RADIUS server
LNS Log File, RADIUS server statistics and
log
RADIUS client receives response from
RADIUS server and notifies LAC
LNS Log File, wfRadiusStatsEntry
IPCP negotiation between dial-in user and
LNS
PPP messages in LNS log file
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