add optional IPv6 egress via NAT66 (NETWORK_IPV6=nat)#12
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Add an opt-in IPv6 path for VMs. By default a migrant VM still has no routable IPv6 (dropped at the FORWARD chain); setting NETWORK_IPV6=nat in a Migrantfile gives the guest a ULA and masquerades it to the host's IPv6 uplink, mirroring the IPv4 NAT. Network isolation still blocks the host and LAN over IPv6. - migrant ip -6 and migrant status surface the VM's IPv6 (ULA) address - refused alongside WireGuard (fwmark routing is IPv4-only, so IPv6 would bypass the tunnel) - NETWORK_IPV6 is validated to nat/off; sample Migrantfiles set off
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NETWORK_IPV6=nat)
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NETWORK_IPV6=natin aMigrantfileto give the VM a ULA that the host masquerades to its own IPv6 uplink, mirroring the existing IPv4 NAT.NETWORK_IPV6=natthe VM's IPv6 is still dropped at theFORWARDchain, so nothing changes for existing VMs.NETWORK_ISOLATIONon (the default), the VM reaches the internet but not the host or LAN.virbr-migrantso neighbor discovery to the ULA gateway works; without it NAT66 reply traffic dies on host firewalls that accept ICMPv6 only fromfe80::/10.migrant ip -6andmigrant statussurface the VM's IPv6 (ULA) address, read best-effort from the DHCPv6 lease.migrantnetwork to gain the IPv6 subnet — documented in the README with a migration walkthrough.