I observed a peculiar situation today on an ADSL link using pptpclient
and the userland ppp daemon: the LCP negociation hunk in state
Ack-Rcvd for almost 3 hours (until I killed it) without any progress,
but without timing out, either.

Here is an excerpt from the log:

Apr  3 05:25:02 melusine ppp[53064]: tun0: LCP: deflink: State change Initial --> 
Closed
Apr  3 05:25:02 melusine ppp[53064]: tun0: LCP: deflink: State change Closed --> 
Stopped
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP: deflink: LayerStart
Apr  3 05:25:03 melusine ppp[53064]: tun0: Warning: deflink: Reducing configured MRU 
from 1500 to 1480
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP: deflink: SendConfigReq(1) state = 
Stopped
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP:  ACFCOMP[2]
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP:  PROTOCOMP[2]
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP:  ACCMAP[6] 0x00000000
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP:  MRU[4] 1480
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP:  MAGICNUM[6] 0x91e371fe
Apr  3 05:25:03 melusine ppp[53064]: tun0: LCP: deflink: State change
Stopped --> Req-Sent
Apr  3 05:25:06 melusine ppp[53064]: tun0: LCP: deflink: SendConfigReq(1) state = 
Req-Sent
Apr  3 05:25:06 melusine ppp[53064]: tun0: LCP:  ACFCOMP[2]
Apr  3 05:25:06 melusine ppp[53064]: tun0: LCP:  PROTOCOMP[2]
Apr  3 05:25:06 melusine ppp[53064]: tun0: LCP:  ACCMAP[6] 0x00000000
Apr  3 05:25:06 melusine ppp[53064]: tun0: LCP:  MRU[4] 1480
Apr  3 05:25:06 melusine ppp[53064]: tun0: LCP:  MAGICNUM[6] 0x91e371fe
Apr  3 05:25:09 melusine ppp[53064]: tun0: LCP: deflink: SendConfigReq(1) state = 
Req-Sent
Apr  3 05:25:10 melusine ppp[53064]: tun0: LCP:  ACFCOMP[2]
Apr  3 05:25:10 melusine ppp[53064]: tun0: LCP:  PROTOCOMP[2]
Apr  3 05:25:10 melusine ppp[53064]: tun0: LCP:  ACCMAP[6] 0x00000000
Apr  3 05:25:10 melusine ppp[53064]: tun0: LCP:  MRU[4] 1480
Apr  3 05:25:10 melusine ppp[53064]: tun0: LCP:  MAGICNUM[6] 0x91e371fe
Apr  3 05:25:10 melusine ppp[53064]: tun0: LCP: deflink: RecvConfigAck(1) state = 
Req-Sent
Apr  3 05:25:10 melusine ppp[53064]: tun0: LCP: deflink: State change Req-Sent --> 
Ack-Rcvd
Apr  3 08:11:27 melusine ppp[53064]: tun0: Phase: Signal 15, terminate.

In other sessions that I have a trace of, I never enter Ack-Recvd,
but instead:

Apr  3 08:12:07 melusine ppp[61776]: tun0: LCP: deflink: RecvConfigReq(224) state = 
Req-Sent

This box is running 4.5-STABLE kernel and world cvsuppsed 10 days or so
ago. Any idea why it did not time out?

Thomas.

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