troubleshooting Question

L2TP tunnel sudden disconnected

Avatar of david-marti
david-martiFlag for Spain asked on
RoutersVPN
3 Comments2 Solutions1585 ViewsLast Modified:
Hi experts,

I use a cisco router 877w to establish L2TP VPN tunnels. This router uses the Microsoft IAS (radius) to auhenticate incoming client requests to establish a tunnel. This setup was working fine until last week, and now, when a client successfully establishes a L2TP tunnel, after 20 seconds the tunnel is suddenly closed. This is the output of "debug vpnd events" from the router:

Dec 16 15:33:57.334: VPDN Received L2TUN socket message <xCRQ - Session Incoming>
Dec 16 15:33:57.338: VPDN Tnl/Sn 17533 57 L2TUN socket session accept requested
Dec 16 15:33:57.338: VPDN Tnl/Sn 17533 57 Setting up dataplane for L2-L2, no idb
Dec 16 15:33:57.442: VPDN Received L2TUN socket message <xCCN - Session Connected>
Dec 16 15:33:57.446: VPDN uid:56 VPDN session up
Dec 16 15:33:59.849: VPDN Vi3 Virtual interface created for unknown, bandwidth 1000000 Kbps
Dec 16 15:33:59.849: VPDN Vi3 Setting up dataplane for L2-L3, Vi3
Dec 16 15:33:59.849: VPDN Received L2TUN socket message <Dataplane UP>
Dec 16 15:33:59.853: %LINK-3-UPDOWN: Interface Virtual-Access3, changed state to up
Dec 16 15:34:00.853: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access3, changed state to up

Dec 16 15:34:20.076: VPDN Vi3 disconnect (TEST-CMD) IETF: 9/nas-error Ascend: 66/VPDN Local PPP Disconnect
Dec 16 15:34:20.076: VPDN Vi3 vpdn shutdown session, result=2, error=7, vendor_err=0
Dec 16 15:34:20.076: VPDN Vi3 VPDN/AAA: accounting stop sent
Dec 16 15:34:20.076: VPDN Vi3 Unbinding session from idb
Dec 16 15:34:20.076: Vi3 VPDN: Resetting interface
Dec 16 15:34:20.084: %LINK-3-UPDOWN: Interface Virtual-Access3, changed state to down
Dec 16 15:34:20.980: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access3, changed state to down

Any help will be greatly apprecied.

Thanks.
Join the community to see this answer!
Join our exclusive community to see this answer & millions of others.
Unlock 2 Answers and 3 Comments.
Join the Community
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 2 Answers and 3 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros