Outgoing IP / OnLink Default Route

[dedene]

I'm currently running a Talos cluster on Hezner cloud. They have the concept of floating ips, which I'd like to use for having a fixed outgoing ip address (for whitelisting in other applications).

A custom route with the source set to the floating ip should enable this if I'm not mistaken:

interfaces:
      - interface: eth0 
        addresses:
          - a.b.c.d/32
        routes:
          - network: 0.0.0.0/0
            gateway: 172.31.1.1
            source: a.b.c.d

However this is not working. Hetzner uses the special 172.31.1.1 as default gateway in it's cloud network. With DHCP it's working and I can see from #4320 this is probably because in dhcp the onlink or NextHop is added. Is there any way to get this to work for static configured ip addresses?

Many thanks for your help!

[smira]

You can add link-scope route by adding a route without a gateway, in your case you need something like I guess:

interfaces:
      - interface: eth0 
        addresses:
          - a.b.c.d/32
        routes:
          - gateway: 172.31.1.1
          - network: 172.31.1.1/32

[smira]

(note these are two routes - one says that 172.31.1.1 is accessible via eth0, and another one sets it as a default gw)

[dedene]

Awesome, that works! 🎉 Thanks a lot for you help!!