It's important you provide command line of your Qemu calls.
Narcis Garcia El 7/11/20 a les 5:38, Cliff Pratt ha escrit: > I'm posting this because it may help someone who ends up in the same > situation as I did. > > I run Ubuntu and before a recent upgrade, I was running 20.04. I had > already installed Qemu and created a number of guests. I also had docker > installed as a snap. > > I upgraded Ubuntu from 20.04 to 20.10 and my guests stopped working! > > After a LOT of digging around, I discovered that Ubuntu has switched to > nftables from the legacy iptables portions of Netfilter. There are now > two iptables versions - iptables-nft (which is aliased to iptables) and > iptables-legacy. > > For reasons which I do not understand, the snap docker version uses (or > seems to use) the legacy version. It sets the policy of the FORWARD > chain to DROP, and this causes the Qemu packets to be dropped. > > The solution, for me, was to disable the docker snap for now. > > There are obvious holes in the explanation above. Maybe someone with > more knowledge of how these things interact with one another could fill > in the holes, but the above may help someone. > > -- > My Amazon author page : https://amazon.com/author/cliffpratt > <http://amazon.com/author/cliffpratt> > My Facebook author page : https://www.facebook.com/cliffprattauthor > My Search on Kobo : https://www.kobo.com/search?query=Cliff+Pratt >