tcpdump mailing list archives

Re: RFC: DLT for "application TCP stream capture"


From: "Paul \"LeoNerd\" Evans" <leonerd () leonerd org uk>
Date: Wed, 14 Jan 2015 17:08:33 +0000

On Wed, 14 Jan 2015 11:57:53 -0500
Michael Richardson <mcr () sandelman ca> wrote:

    > It does momentarily seem wasteful to repeat the
    > source/destination information in every single packet
    > (especially in the case of IPv6 with its 256bits of addressing
    > information). Though I don't know if that outweighs the
    > statefulness and added complexity of representing "flow setup"
    > operations and "more bytes of data sent/received on this flow"
    > as extra frame types.

Eventually, we'll be using this format to debug multi-path TCP, in
which case the IP addresses (and maybe even the IP4/IP6-ness of it)
might change.

And gzip'ed those addresses will compress quite easily.

OK, so I'll stick with the simplicity of just repeating it for every
frame then.

-- 
Paul "LeoNerd" Evans

leonerd () leonerd org uk
http://www.leonerd.org.uk/  |  https://metacpan.org/author/PEVANS
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