qubes-firewall will now blacklist IP addresses from all connected
machines on non-vif* interfaces. This prevents spoofing source or
target address on packets going over an upstream link, even if
a VM in question is powered off at the moment.
Depends on QubesOS/qubes-core-admin#303 which makes admin maintain
the list of IPs in qubesdb.
FixesQubesOS/qubes-issues#5540.
If IPv6 is configured in the VM, and it is providing network to others,
apply IPv6 firewall similar to the IPv4 one (including NAT for outgoing
traffix), instead of blocking everything. Also, enable IP forwarding for
IPv6 in such a case.
FixesQubesOS/qubes-issues#718