CHAP Challenge/Response loop on ppp connection - Networking

This is a discussion on CHAP Challenge/Response loop on ppp connection - Networking ; Hi, I am connecting from a Linux machine to an ISA server via ppp/pptp. The connection handshake start correctly and the loop on the CHAP Challenge/Response messages until it terminate the connection. The connection log is show here: [...] rcvd ...

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Thread: CHAP Challenge/Response loop on ppp connection

  1. CHAP Challenge/Response loop on ppp connection

    Hi,
    I am connecting from a Linux machine to an ISA server via ppp/pptp.
    The connection handshake start correctly and the loop on the CHAP
    Challenge/Response messages until it terminate the connection.
    The connection log is show here:

    [...]
    rcvd [LCP ConfReq id=0x3 0x4fcf316c> [local:c8.29.40.c9.59.54.49.83.84.91.40.0c.5f.19.dc .7c.00.00.00.00]>]
    sent [LCP ConfAck id=0x3 0x4fcf316c> [local:c8.29.40.c9.59.54.49.83.84.91.40.0c.5f.19.dc .7c.00.00.00.00]>]
    sent [LCP EchoReq id=0x0 magic=0x84461837]
    rcvd [CHAP Challenge id=0x0 <0bdba4f.....87ee44>, name = "HISNAME"]
    sent [CHAP Response id=0x0 <971b80a0172......6fb804415600>, name =
    "MYNAME"]
    rcvd [CHAP Challenge id=0x1 <7d776e27....bc3304>, name = "HISNAME"]
    sent [CHAP Response id=0x1 <093cb625afc....66c94e575f900>, name =
    "MYNAME"]
    rcvd [CHAP Challenge id=0x2 <7a551ee....6490d88>, name = "HISNAME"]
    sent [CHAP Response id=0x2 , name = "MYNAME"]
    rcvd [CHAP Challenge id=0x3 , name = "HISNAME"]
    sent [CHAP Response id=0x3 <620e3b29.......7157000>, name = "MYNAME"]
    rcvd [CHAP Challenge id=0x4 , name = "HISNAME"]
    sent [CHAP Response id=0x4 , name = "MYNAME"]
    rcvd [CHAP Challenge id=0x5 , name = "HISNAME"]
    sent [CHAP Response id=0x5 <09b13fb.....80a900>, name = "MYNAME"]
    rcvd [CHAP Challenge id=0x6 <528b60.....de7817>, name = "HISNAME"]
    sent [CHAP Response id=0x6 <47a9cf3.....ff21900>, name = "MYNAME"]
    rcvd [CHAP Challenge id=0x7 , name = "HISNAME"]
    sent [CHAP Response id=0x7 , name = "MYNAME"]
    rcvd [CHAP Challenge id=0x8 <1420....31b4>, name = "HISNAME"]
    sent [CHAP Response id=0x8 , name = "MYNAME"]
    rcvd [CHAP Challenge id=0x9 <40321a9....68b6>, name = "HISNAME"]
    sent [CHAP Response id=0x9 , name = "MYNAME"]
    rcvd [LCP TermReq id=0x4 "O\377777777171l\000<\37777777715t
    \000\000\002\37777777716"]
    LCP terminated by peer (OM-O1l^@ sent [LCP TermAck id=0x4]
    rcvd [LCP TermReq id=0x5 "O\377777777171l\000<\37777777715t
    \000\000\002\37777777716"]
    sent [LCP TermAck id=0x5]
    Connection terminated.
    [...]

    Does anyone have any idea of what is happening?

    Thanks,
    Giuseppe

  2. Re: CHAP Challenge/Response loop on ppp connection

    In article ,
    Giuseppe Sacco wrote:
    >Hi,
    >I am connecting from a Linux machine to an ISA server via ppp/pptp.
    >The connection handshake start correctly and the loop on the CHAP
    >Challenge/Response messages until it terminate the connection.
    >The connection log is show here:
    >
    >[...]
    >rcvd [LCP ConfReq id=0x3 >0x4fcf316c> >[local:c8.29.40.c9.59.54.49.83.84.91.40.0c.5f.19.dc .7c.00.00.00.00]>]
    >sent [LCP ConfAck id=0x3 >0x4fcf316c> >[local:c8.29.40.c9.59.54.49.83.84.91.40.0c.5f.19.dc .7c.00.00.00.00]>]


    Where is the LCP ConfReq that your machine sent, along with the response(s)
    from the peer?

    >sent [LCP EchoReq id=0x0 magic=0x84461837]
    >rcvd [CHAP Challenge id=0x0 <0bdba4f.....87ee44>, name = "HISNAME"]
    >sent [CHAP Response id=0x0 <971b80a0172......6fb804415600>, name =
    >"MYNAME"]
    >rcvd [CHAP Challenge id=0x1 <7d776e27....bc3304>, name = "HISNAME"]
    >sent [CHAP Response id=0x1 <093cb625afc....66c94e575f900>, name =
    >"MYNAME"]
    >rcvd [CHAP Challenge id=0x2 <7a551ee....6490d88>, name = "HISNAME"]
    >sent [CHAP Response id=0x2 , name = "MYNAME"]
    >rcvd [CHAP Challenge id=0x3 , name = "HISNAME"]
    >sent [CHAP Response id=0x3 <620e3b29.......7157000>, name = "MYNAME"]
    >rcvd [CHAP Challenge id=0x4 , name = "HISNAME"]
    >sent [CHAP Response id=0x4 , name = "MYNAME"]
    >rcvd [CHAP Challenge id=0x5 , name = "HISNAME"]
    >sent [CHAP Response id=0x5 <09b13fb.....80a900>, name = "MYNAME"]
    >rcvd [CHAP Challenge id=0x6 <528b60.....de7817>, name = "HISNAME"]
    >sent [CHAP Response id=0x6 <47a9cf3.....ff21900>, name = "MYNAME"]
    >rcvd [CHAP Challenge id=0x7 , name = "HISNAME"]
    >sent [CHAP Response id=0x7 , name = "MYNAME"]
    >rcvd [CHAP Challenge id=0x8 <1420....31b4>, name = "HISNAME"]
    >sent [CHAP Response id=0x8 , name = "MYNAME"]
    >rcvd [CHAP Challenge id=0x9 <40321a9....68b6>, name = "HISNAME"]
    >sent [CHAP Response id=0x9 , name = "MYNAME"]
    >rcvd [LCP TermReq id=0x4 "O\377777777171l\000<\37777777715t
    >\000\000\002\37777777716"]
    >LCP terminated by peer (OM-O1l^@ >sent [LCP TermAck id=0x4]
    >rcvd [LCP TermReq id=0x5 "O\377777777171l\000<\37777777715t
    >\000\000\002\37777777716"]
    >sent [LCP TermAck id=0x5]
    >Connection terminated.
    >[...]
    >
    >Does anyone have any idea of what is happening?


    It's acting like the other side isn't seeing your CHAP Response packets. If
    it was, it would return a CHAP Success or CHAP Failure packet. Check your
    ACCM and make sure the link can do pure binary. Can you get a packet trace
    from the peer's point of view?

    Patrick
    ========= For LAN/WAN Protocol Analysis, check out PacketView Pro! =========
    Patrick Klos Email: patrick@klos.com
    Klos Technologies, Inc. Web: http://www.klos.com/
    ================================================== ==========================

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