Date: Tue, 26 Sep 2017 11:45:55 +0200 From: Julian Kornberger <jk@kornberger.name> To: Sepherosa Ziehau <sepherosa@gmail.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: igb(4) txcsum6 broken in few cases Message-ID: <1df7456b-06c6-935f-c399-4bbb9d33280d@kornberger.name> In-Reply-To: <CAMOc5cxY7ykP1sr%2Bt4C-4PfphSYCNHr2iBciua6s1R0rANhhPA@mail.gmail.com> References: <4cdc0f02-0ec4-4f1a-f14a-d4eeef78cbe0@kornberger.name> <CAMOc5cxY7ykP1sr%2Bt4C-4PfphSYCNHr2iBciua6s1R0rANhhPA@mail.gmail.com>
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Hi Sepherosa, I attached a dump. I can provide bigger dumps, but not in public, because they might contain sensitive data. The outgoing UDP packets are created by my fastd kernel module [1] that is a simple UDP tunneling protocol that encapsulates IP packets using M_PREPEND. Some code is similar to if_vxlan.c. ICMPv4 echo requests inside of the tunnel lead to invalid checksums in > 95% of the cases. But also other packets types are affected. [1] https://github.com/digineo/fastd/blob/master/kmod/fastd.c Regards, Julian On 26.09.2017 07:10, Sepherosa Ziehau wrote: > It will be more than helpful, if you can provides tcpdumps.
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