Xen networking problems in -current with xn driver?

Kevin Oberman rkoberman at gmail.com
Tue Aug 2 23:52:11 UTC 2016

On Tue, Aug 2, 2016 at 11:12 AM, Julian Elischer <julian at freebsd.org> wrote:

> I upgraded my VPS machine to today's current, and on reboot I couldn't get
> into it by network.
> A quick switch to the VNC console showed that it was up but that it
> couldn't get out.
> The xn interfaces said they were UP but attempts to get out were met with
> "network is down".
> if I did 'tcpdump -n -i xn0' (and xn1) hten all was fine again.
> tcpdump saw packets, and in fact ipfw saw some packets coming in even
> before that but it was not possible to send.
> Has anyone seen similar?
> some relevant parts of the dmesg output.:
> [...]

A bit of a guess, but the obvious thing that I see  is that when you start
tcpdump you are placing the interface in promiscuous mode. Looks like the
"device" fails to properly see packet addressed to it.
Kevin Oberman, Part time kid herder and retired Network Engineer
E-mail: rkoberman at gmail.com
PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683

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