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 <mru 1400> <auth chap MS-v2> <magic
0x4fcf316c> <pcomp> <accomp> <endpoint
[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 <mru 1400> <auth chap MS-v2> <magic
0x4fcf316c> <pcomp> <accomp> <endpoint
[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 <c14c5cc.....d9c7200>, name = "MYNAME"]
rcvd [CHAP Challenge id=0x3 <ed457......15d8bac>, name = "HISNAME"]
sent [CHAP Response id=0x3 <620e3b29.......7157000>, name = "MYNAME"]
rcvd [CHAP Challenge id=0x4 <d3dd302......97c1>, name = "HISNAME"]
sent [CHAP Response id=0x4 <c82839b......8b8800>, name = "MYNAME"]
rcvd [CHAP Challenge id=0x5 <d49cc....9e3ce9f>, 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 <cdf5....b613d>, name = "HISNAME"]
sent [CHAP Response id=0x7 <e61b2a......6e100>, name = "MYNAME"]
rcvd [CHAP Challenge id=0x8 <1420....31b4>, name = "HISNAME"]
sent [CHAP Response id=0x8 <ce045b2b.....439900>, name = "MYNAME"]
rcvd [CHAP Challenge id=0x9 <40321a9....68b6>, name = "HISNAME"]
sent [CHAP Response id=0x9 <af56995....c42b00>, name = "MYNAME"]
rcvd [LCP TermReq id=0x4 "O\377777777171l\000<\37777777715t
\000\000\002\37777777716"]
LCP terminated by peer (OM-O1l^@<M-Mt^@^@^BM-N)
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

In article <ec3b6a1a-e90e-45ec-951f-(E-Mail Removed)>,
Giuseppe Sacco <(E-Mail Removed)> 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 <mru 1400> <auth chap MS-v2> <magic
>0x4fcf316c> <pcomp> <accomp> <endpoint
>[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 <mru 1400> <auth chap MS-v2> <magic
>0x4fcf316c> <pcomp> <accomp> <endpoint
>[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 <c14c5cc.....d9c7200>, name = "MYNAME"]
>rcvd [CHAP Challenge id=0x3 <ed457......15d8bac>, name = "HISNAME"]
>sent [CHAP Response id=0x3 <620e3b29.......7157000>, name = "MYNAME"]
>rcvd [CHAP Challenge id=0x4 <d3dd302......97c1>, name = "HISNAME"]
>sent [CHAP Response id=0x4 <c82839b......8b8800>, name = "MYNAME"]
>rcvd [CHAP Challenge id=0x5 <d49cc....9e3ce9f>, 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 <cdf5....b613d>, name = "HISNAME"]
>sent [CHAP Response id=0x7 <e61b2a......6e100>, name = "MYNAME"]
>rcvd [CHAP Challenge id=0x8 <1420....31b4>, name = "HISNAME"]
>sent [CHAP Response id=0x8 <ce045b2b.....439900>, name = "MYNAME"]
>rcvd [CHAP Challenge id=0x9 <40321a9....68b6>, name = "HISNAME"]
>sent [CHAP Response id=0x9 <af56995....c42b00>, name = "MYNAME"]
>rcvd [LCP TermReq id=0x4 "O\377777777171l\000<\37777777715t
>\000\000\002\37777777716"]
>LCP terminated by peer (OM-O1l^@<M-Mt^@^@^BM-N)
>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: (E-Mail Removed)
Klos Technologies, Inc. Web: http://www.klos.com/
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