netdev - Re: Linux kernel error stack

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Message-ID: <20180805210121.holfmbbkqywpp3zd@breakpoint.cc>
Date:   Sun, 5 Aug 2018 23:01:21 +0200
From:   Florian Westphal <fw@...len.de>
To:     Satish Patel <satish.txt@...il.com>
Cc:     Florian Westphal <fw@...len.de>, netdev@...r.kernel.org
Subject: Re: Linux kernel error stack

Satish Patel <satish.txt@...il.com> wrote:
> After reading further related DHCP checksum issue, it seems we need
> that rules when you running DHCP on same host machine where your guest
> using host DHCP service, in that case virtual nic won't do checksum.
> If your DHCP running on different host then your physical nic perform
> checksum.

Partially right, its only needed for older dhcp software that relies
on packet-header checksum correctness (metadata contains info when
checksum will be filled in by nic later, modern servers will
use that and ignore the packet-header checksums in this case).

If you remove the rule and your VMs still get leases via DHCP then
the CHECKSUM workaround isn't needed.