I investigated the problem back to repeated tries of the DUN to establish a
compressed connection via CCP - I think it tries to do MS-Stac.....
These tries time out a few times, then the DUN gives up.
The MAX sends no protocol-NAK or protocol-REJ (as I would expect), instead it
sends Terminate-Acks, as answers to the DUN, which seems unlogical to me, but
is possible according to RFC's - maybe it happens because at the time DUN
starts CCP-Negotiations the MAX starts different negotiations and tries to tell
the DUN to reset the CCP.
This is okay so far - but what goes wrong ?
>From what I've seen in the logs I assume that the problem arises from different
opinons of the interpretation of the RFC's.
The DUN behaves correctly by retrying to negotiate the CCP (according to
RFC1331) after the timeout, but the MAX always gives the same answer:
"Terminate-Ack" - even if there is nothing else to do anymore (like IPCP and
alike). This behaviour seems not correct to me - the MAX should answer with an
appropriate Protocol-(ACK|NAK|REJ), but doesn't.....
The reason for this might be that the DUN sends always the same Packet-ID's,
which might make the MAX "think" that the previous "Terminate-Ack's" haven't
reached their target.
The RFC is a bit unclear about incrementing the Packet-ID's - it says that
Packet-ID's MUST be incremented when information is changed, but MAY be changed
when timeout occurs.
Well in this case timeouts occur - I assume the Ascend-OS-Implementors did a
different interpretation then the M$-Implementors did, so the sh.. happened.
There is no acknowledge-mechanism of the "please reset your protocol
negotiations" by sending "Terminate-Ack", so the different interpretations
could escalate.
I would suggest that the MAX-OS shall not assume that the "Terminate-Ack"
didn't reach it's target when not receiving higher packet-ID's - even if they
did not, there should be no problem, because the protocol negotiations time out
anyway.
Anyway - when finding a "MAY" in a RFC, shouldn't there be made no assumptions
and the software be programmed that way, that it is able cope with every
possible interpretation ? - Okay, no doubt, this is alway easier said than
done.
If anyones interested in the logs that made me think the above stated, let me
know, maybe someone finds a more correct solution !
--
MfG,
Lars Foerster,
Systemadministrator
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