Hopefully this should be an easy one.
We have an 837 ADSL router configured and operational, the DSL appears fine and tests out OK.
The problem only occurs once we enable the VPN, the VPN establishes normally but after about 20secs of successfully pushing traffic over it the layer 2 comes down on the DSL. The router needs to be reset before the DSL line can be used again.
This problem is predictable and can easily be reproduced.
deb ppp neg
00:42:27: Vi2 PPP: Outbound cdp packet dropped, CDPCP state is Listen
00:42:30: Vi2 PPP: Missed 3 keepalives, taking LCP down
00:42:30: Vi2 PPP: Sending Acct Event[Down] id[2]
00:42:30: Vi2 LCP: State is Closed
00:42:30: Vi2 PPP: Phase is DOWN
00:42:30: Vi2 CDPCP: State is Closed
00:42:30: Vi2 IPCP: Remove link info for cef entry 217.41.206.74
00:42:30: Vi2 IPCP: State is Closed
00:42:30: Vi2 PPP: Phase is ESTABLISHING, Passive Open
00:42:30: Vi2 LCP: State is Listen
00:42:30: Di1 IPCP: Remove route to 217.41.206.74
00:42:31: Vi2 PPP: Outbound ip packet dropped, line protocol not up
00:42:31: Vi2 PPP: Outbound ip packet dropped, line protocol not up
00:42:31: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to down
00:42:31: Vi2 PPP: Outbound cdp packet dropped, line protocol not up
00:42:32: Vi2 LCP: TIMEout: State Listen
00:42:32: Vi2 PPP: No remote authentication for call-out
00:42:32: Vi2 LCP: O CONFREQ [Listen] id 3 len 10
00:42:32: Vi2 LCP: MagicNumber 0x0D50E029 (0x05060D50E029)
00:42:33: Vi2 PPP: Outbound ip packet dropped, line protocol not up
00:42:33: Vi2 PPP: Outbound ip packet dropped, line protocol not up
00:42:34: Vi2 LCP: TIMEout: State REQsent
00:42:34: Vi2 LCP: O CONFREQ [REQsent] id 4 len 10
00:42:34: Vi2 LCP: MagicNumber 0x0D50E029 (0x05060D50E029)
00:42:35: Vi2 PPP: Outbound ip packet dropped, line protocol not up
00:42:36: Vi2 LCP: TIMEout: State REQsent
00:42:36: Vi2 LCP: O CONFREQ [REQsent] id 5 len 10
00:42:36: Vi2 LCP: MagicNumber 0x0D50E029 (0x05060D50E029)
