[ale] pppd LCP Terminating

[Tom Wiencko]

Robert Beverly wrote:
> 
> I am having trouble with a particular ppp connection.  I CHAP authenticate
> fine, negotiate IP addresses and then it immediately drops my connection
> with a "LCP Terminated at peer's request" in the syslog.  I can bring 

.... mucho deleted.....


It appears that the first sign of real trouble is the CCP 
(compression control protocol, RFC 1962) is unhappy about some
compression configuration negotiation, which is causing a CCP 
termination request.  This leads to a link control termination, and
splat.

> Jul 31 23:47:42 laguna pppd[943]: rcvd [CCP ConfRej id=0x1]
                                          -----------
> Jul 31 23:47:42 laguna pppd[943]: rcvd [CCP TermReq id=0x2]
> Jul 31 23:47:42 laguna pppd[943]: sent [CCP TermAck id=0x2]
> Jul 31 23:47:42 laguna pppd[943]: rcvd [LCP TermReq id=0x1]
> Jul 31 23:47:42 laguna pppd[943]: LCP terminated at peer's request
> Jul 31 23:47:42 laguna pppd[943]: sent [LCP TermAck id=0x1]
> Jul 31 23:47:43 laguna pppd[943]: Hangup (SIGHUP)
> Jul 31 23:47:43 laguna pppd[943]: Modem hangup
> Jul 31 23:47:43 laguna pppd[943]: Connection terminated.
> Jul 31 23:47:43 laguna pppd[943]: Exit.
> Jul 31 23:49:36 laguna kernel: PPP: ppp line discipline successfully
> unregistere

What to do?  Not sure, and have not looked through the protocol
recently, but you might want to turn off all compression and see
if that helps.  If you're feeling brave, do a packet trace and
see exactly where in the protocol the negotiation is failing.  What
is sort of strange is that a failed compression negotiation is not
supposed to kill the link, rather it just disables compression on
the link (see top of page 6 of the RFC).

Good luck.

-Tom

---------------------------------------------------------------------
Tom Wiencko                                            tew at wiencko.com
President - Wiencko & Associates, Inc.