Re: [libvirt-users] KVM NAT stops from working

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.