tcpdump mailing list archives

Re: "not vlan" filter expression brokencatastrophically!


From: "David Laight" <David.Laight () ACULAB COM>
Date: Mon, 4 Feb 2013 09:29:58 -0000

I agree. Honestly I think a perfectly reasonable stance to take is
requesting that the filters get packets *as seen on the wire/nic*. I
think that's the mental model everyone uses, and any deviation from
that model is prone to bugs in the kernel, libpcap, and for the enduser.

TX and RX segmentation offload also confuse matters here.
I think Linux can give libpcap large TCP fragments even when the
hardware isn't doing segmentation offload.
This also breaks the mental model.

        David



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