On Sun, Sep 23, 2001 at 02:04:30PM -0300, Mercia Eliane Bittencourt Figueredo wrote:
> >Congratulations! You've managed to find *two separate* bugs in
> >tcpdump's "cip_print()" routine!
> :)
I've checked in some changes that should fix those bugs - as well as
making it just call the LLC print routine to handle packets with an LLC
header, rather than dissecting the LLC header itself.
> I am working with Forerunner LE 25( IDT driver), Forerunner LE 155(IDT
> driver) and ForerunnerHE 155(Chas Willian driver
> :ftp://ftp.cmf.nrl.navy.mil/pub/chas/linux-atm/)
> The linux kernel is linux-2.4.9-ac5 and it has the IDT driver and I am
> working with atm-0.78.tar.gz from "ATM on linux" site
Looking at the ATM code in 2.4.9 (not the -ac5 version), it appears
that, in addition to supporting LLC encapsulation, it also supports
"null encapsulation", which I assume is what RFC 1483 calls "VC Based
Multiplexing", where a given virtual circuit carries only traffic for a
particular network-layer protocol, and no header is added to the IP
packet.
Are you using null encapsulation or LLC/SNAP encapsulation?
I think it *might* be possible to make capture filters that check for AA
AA 03 00 00 00, to determine whether null or LLC/SNAP encapsulation is
being used, but I'm not sure it's actually worth the trouble of doing
so, rather than just using "cooked mode", as my patch does.
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