f0b1cdb189
Per a comment on the PR that made this change, it turns out to cause issues in some cases: https://github.com/NixOS/nixpkgs/pull/109332#issuecomment-762005163 For now, let's revert back. Presumably the issues derive from the system iptables not matching libvirt's iptables. In the future, #81172 should move us back into the future, and I'm perfectly fine waiting for that PR to handle this separately.