[Bug 188990] [xen] dhclient(8) does not accept DHCP Offer on FreeBSD 10 as Xen DomU Guest

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188990

--- Comment #11 from Bhavesh Davda <bhavesh.davda at gmail.com> ---
(In reply to Roger Pau Monné from comment #9)

Yes, in a FreeBSD 11.0 VM, I had already verified this workaround works:

in /etc/rc.conf:

ifconfig_XN0="DHCP -rxcsum"

Note that you only need to disable Rx checksum offload, as the issue is with
UDP BOOTP packets received with an offloaded but "invalid" UDP checksum.

However, I expect this workaround to have an unnecessary performance impact on
receive packet throughput over xn0; basically you're using a 'big hammer' to
completely disable an offload only because one application (dhclient) can't
deal with a couple of UDP packets.

More comments in a separate update...

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