IPCP gets interrupted suddenly

Discussion in 'Linux Networking' started by alessandro.strazzero, Sep 28, 2012.

  1. Hi everybody,

    I'm fighting against an IPCP issue which I've never seen. I'm working on
    a Debian 5.0 (lenny) distribution with PPPD v.2.

    After a successfully PAP autentication, my computer starts IPCP by sending option
    0x01 (IP addresses) with all zeroes (I want my address and DNS addresses set by
    The second frame I see is the server proposal of its address which is immediately
    What I would expect is an acknoledge of server at my first request which never
    arrives. Then PPPD hangs up the line.

    Following you can find the log of the conversation:

    Serial connection established.
    using channel 14
    Using interface ppp0
    Connect: ppp0 <--> /dev/ttyS4
    sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x9c32b350> <pcomp> <accomp>]
    rcvd [LCP ConfRej id=0x1 <pcomp> <accomp>]
    sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x9c32b350>]
    rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <auth pap> <magic 0xe8d43500>]
    sent [LCP ConfAck id=0x1 <asyncmap 0x0> <auth pap> <magic 0xe8d43500>]
    rcvd [LCP ConfAck id=0x2 <asyncmap 0x0> <magic 0x9c32b350>]
    sent [LCP EchoReq id=0x0 magic=0x9c32b350]
    sent [PAP AuthReq id=0x1 user="pippo" password="pluto"]
    rcvd [LCP EchoRep id=0x0 magic=0x16d53500]
    rcvd [PAP AuthAck id=0x1 "Welcome!"]
    Remote message: Welcome!
    PAP authentication succeeded
    sent [IPCP ConfReq id=0x1 <addr> <ms-dns1> <ms-dns3>]
    rcvd [IPCP ConfReq id=0x1 <addr>]
    sent [IPCP ConfAck id=0x1 <addr>]
    Hangup (SIGHUP)
    Modem hangup
    Connection terminated.

    Any idea ?

    Best Regards

    alessandro.strazzero, Sep 28, 2012
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  2. alessandro.strazzero

    Moe Trin Guest

    On Fri, 28 Sep 2012, in the Usenet newsgroup comp.os.linux.networking, in
    article <>,

    NOTE: Posting from groups.google.com (or some web-forums) dramatically
    reduces the chance of your post being seen. Find a real news server.

    I see you also posted this to comp.protocols.ppp - please don't post
    the same article to multiple newsgroups.
    Lenny is a bit on the old side - squeeze was released early last year.
    I'm guessing that's ppp-2.4.4 or 2.4.5, but it's not really critical.
    Close enough Is this an ISP with a plain old telephone modem or is
    this a digital GPRS or similar?
    Hmmmmm.... Any idea why the peer doesn't want header compression?
    Any particular reason you are using LCP Echos? The reply is garbled
    (magic should be 0xe8d43500 - see RFC1661 sections 5.8 and 6.4) which
    could be a serial link problem.
    Are the packets received in a timely manner? Or are there excessive
    Disable asyncmap negotiation, forcing all control characters
    to be escaped for both the transmit and the receive direc-

    See if that option helps.

    Old guy
    Moe Trin, Sep 29, 2012
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