[virt-tools-list] Curious Connectivity Issue

[Gustave Stresen-Reuter]

Hi and thanks for checking this out. If I can't get this resolved soon I'm
going to have to install an older version of the host OS, get everything
configured, and then try upgrading. Is CentOS a good choice for the host?
I'd use REL but I've never been clear on the licensing and don't want to
put myself in a spot unnecessarily.

Those screen shots are from the host, unfortunately. Apparently, when the
Smoothwall starts up, it executes some sort of script that creates the
Macvtap interfaces and that seems to be where the issue is. If I unplug the
cable without those interfaces created, and plug it back in, connectivity
is restored without issue.

I'll try the command you suggest but…

What should the value of $VM be? macvtap0 or enp5s0 (the interface defined
by the host)? Same question for $MAC…

Thanks again for lending a hand. This is frustrating because these sorts of
things normally just work (thankfully).

Kind regards,

Ted Stresen-Reuter

On Tue, Nov 17, 2015 at 1:13 AM Cole Robinson <crobinso at redhat.com> wrote:

> On 11/16/2015 06:28 AM, Gustave Stresen-Reuter wrote:
> > Hi,
> >
> > I'm new to the list and not even sure if this is the right list to be
> writing
> > to so please feel free to redirect if needed.
> >
> > I've summarized my issue in this blog post:
> > http://chicagoitsystems.com/centos-7-kvm-macvtap-loses-all-connectivity/
> >
> > However, since writing that, I've found that I can regain connectivity by
> > stopping and restarting the guest that uses the Macvtap connections.
> > Apparently, the command that executes that creates the interfaces does
> not
> > include the "allow reconnections" options.+
> >
> > I would really appreciate it if someone could point me in the direction
> I need
> > to go to verify that this is indeed the issue (like, modifying the
> script used
> > to start the machine from the command line to see if I can add… oh wait,
> maybe
> > there is a switch in the XML that is not being set???)
> >
> > Anyway, as you can see, I would appreciate any pointers people on this
> list
> > can give.
> >
>
> Are those screenshots from inside the guest, or is the host side screwed
> up?
>
> If it's just the guest side, maybe this can be fixed by emulating a VM nic
> unplug and replug event. You can do that with
>
> sudo virsh domif-setlink $VM --interface $MAC --state up|down
>
> So give that a shot and let us know if it works
>
> Thanks,
> Cole
>
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