I may just be over-thinking this but I have a scenario that I can configure manually but have not been able to figure out how to amend the networkd configuration to match! # echo "2 starlink" >> /etc/iproute2/rt-tables # ip -6 rule add from 2001:0DB8:1:1::/64 table starlink priority 100 # ip -6 route add default via fe80::1 dev WAN table starlink Note: 'via' required to prevent failed neighbour solicitations for external addresses. The issue is I cannot see how to achieve both 'default' and 'via' in .network ROUTE section (when specifying a routing table). I see recommendations to use `Gateway=::` as an alias for 'default' but that prevents setting the next-hop router address explicitly, which results in failure due to neighbour solicitation. Scenario (current): IPv6 only local network gateway is host using systemd-networkd (systemd 252.12 on Debian 12) gateway is directly connected to Starlink terminal (the 'dish') on interface "WAN" "WAN" interface has only operated on IPv4 until now (CG-NAT) Wireguard IP tunnel to data-center server acting as public gateway Wireguard tunnel only carries IPv6 data-center gateway delegates public IPv6 prefix to local gateway local hosts allocated public addresses by gateway Scenario (new): Starlink terminal now advertises an IPv6 /64 prefix using RA allocate IPv6 from prefix (manually or automatically) to "WAN" use policy routing so replies go out on "WAN" when arriving on that interface (this is to act as a back-up since the Wireguard tunnel will remain the primary routing) /etc/systemd/networkd.conf: [Network] RouteTable=starlink:2 /etc/systemd/network/WAN.network: # ... existing configuration# named tables must be added to /etc/systemd/networkd.conf as name:number pairs, space separated: # [Network] # RouteTable=starlink:2 [Address] Address=2001:0DB8:1:1::dead:beef/64 [RoutingPolicyRule] Table=starlink From=2001:0DB8:1:1::/64 Priority=100 [Route] # starlink terminal link-local address (gateway's should always use link-local address) Gateway=fe80::1 # default route # Gateway=:: GatewayOnLink=true Table=starlink
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