dom0/iptables: block IPv6 traffic
dom0/iptables: block IPv6 traffic

Dom0 is network isolated anyway, but apply also firewall in case of use
qubes-dom0-network-via-netvm.

marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin