From: Michael Richardson <mcr@sandelman.ca>
To: Dave Taht <dave.taht@gmail.com>
Cc: Mikael Abrahamsson <swmike@swm.pp.se>,
cerowrt-devel@lists.bufferbloat.net
Subject: Re: [Cerowrt-devel] ipv6 on comcast with 18.06.1
Date: Mon, 01 Oct 2018 13:13:31 -0400 [thread overview]
Message-ID: <32226.1538414011@localhost> (raw)
In-Reply-To: <CAA93jw67meaOWsL5BAk8uxYwn9DyFQCSK78N8Lk8mLc5mTOEYg@mail.gmail.com>
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Dave Taht <dave.taht@gmail.com> wrote:
> hmm... bad udp checksum???
With some capture mechanisms, tcpdump gets bogus values because the hardware
did the checksums. I wouldn't imagine that we have hardware checksum offload
on openwrt devices, but could be.
Or it's a real issue.
> :/tmp# 09:12:17.404257 IP6 (flowlabel 0xdfff4, hlim 1, next-header UDP
> (17) payload length: 159) fe80::20d:b9ff:fe43:a06c.546 > ff02::1:2.547:
> [bad udp cksum 0x58f4 -> 0xc4a1!] On Mon, Oct 1, 2018 at 9:12 AM Dave
> Taht <dave.taht@gmail.com> wrote:
Did you capture with -i device, or -i any?
--
] Never tell me the odds! | ipv6 mesh networks [
] Michael Richardson, Sandelman Software Works | network architect [
] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails [
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next prev parent reply other threads:[~2018-10-01 17:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-01 15:30 Dave Taht
2018-10-01 15:45 ` Mikael Abrahamsson
2018-10-01 15:58 ` Dave Taht
2018-10-01 16:12 ` Dave Taht
2018-10-01 16:12 ` Dave Taht
2018-10-01 16:29 ` Anderson, Charles R
2018-10-01 16:44 ` Dave Taht
2018-10-01 17:13 ` Michael Richardson [this message]
2018-10-01 17:22 ` Dave Taht
2018-10-01 19:07 ` Mikael Abrahamsson
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