Date: Sat, 10 Sep 2022 20:04:28 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 235607] Incorrect checksums with NAT on vtnet with offloading Message-ID: <bug-235607-7501-CydEVOOF5u@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-235607-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-235607-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235607 --- Comment #15 from Eugene Grosbein <eugen@freebsd.org> --- FreeBSD's vtnet(4) driver upto 12.3 version implements checksum offload for transmit path ONLY. For receive path, it blindly assumes that ALL traffic comes from another virtual machine running on same hypervisor that just did checksumming alrea= dy, so it just skips its own checksumming. The solution is to disable non-worki= ng rxcsum "offload" with ifconfig(8): ifconfig vtnet0 -rxcsum In case of NAT, this solves the problem. --=20 You are receiving this mail because: You are the assignee for the bug.=
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