[libvirt-users] KVM NAT stops from working

[Daniel Romero]

Hi,

can the host reach Internet?

Send us the route table of the host and some one of the guests. The
iptables config file should help too.

Best Regards.
Daniel Romero P.



On Tue, Sep 3, 2019 at 1:22 PM Francesc Guasch <frankie at telecos.upc.edu>
wrote:

> El 3/9/19 a les 18:15, Laine Stump ha escrit:
> > On 9/2/19 10:31 AM, Francesc Guasch wrote:
> >> Hi. First of all thank you for the work you are doing with libvirt.
> >> I am not sure this is the right place to ask, I'd appreciate
> >> if you can give me any hint or directions.
> >>
> >> I have several similar KVM Linux boxes and one of them has a really
> >> strange behavior with the KVM NAT: It just suddenly stops from
> >> working.
>
> >> Any hints ? Thank you very much
> >
> > 1) On a freshly booted machine with running clients connected to
> > libvirt's default network (and successfully sending/receiving traffic,
> > of course :-), get a dump of all active iptables rules with
> >
> >    iptables-save >iptables-working.txt
> >
> > 2) At whatever later time when you notice that the NAT is no longer
> > working properly, get another dump of all the rules with
> >
> >    iptables-save >iptables-broken.txt
> >
> > and compare those two files to see what has changed.
> >
>
> Thank you very much Laine, good point !
>
> I am waiting for it to fail again to compare both iptables.
>
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