[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 #7 from Bhavesh Davda <bhavesh.davda at gmail.com> ---
I'm hitting the same issue, as are other colleagues who have tried various
versions of FreeBSD from 8.4 to 10.0 to 11.0 as a domU guest on Xen.

The issue has to do with checksum offloaded packets arriving from a DHCP server
running in dom-0 on Xen, and dhclient getting fooled by those.

I'm attaching a proposed patch that fixes this issue. I've tested this in a
FreeBSD 11.0 VM on Xen 4.4.4 with a Linux 4.1.12-based dom-0 kernel.

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