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I'm trying to declare a static ipv6 route on the link using netplan (more precisely I'm trying to setup a default gateway whose address is not on my interface subnet)

Basically what I'm trying to do via netplan is:

ip -6 a a fd00::1/64 dev eno4
ip -6 r a fd00:1::2/128 dev eno4

Os: Ubuntu 18.04

Netplan version: 0.36.3

The following solution does not work:

    eno4:
        addresses:
           - fd00::1/64
        routes:
           -   to: fd00:1::2/128
               via: fd00:1::2
               on-link: true

then

netplan --debug apply 
journalctl -u systemd-networkd
eno4: Could not set route: No route to host

and the route does not show up when listing them

I also tried replacing the on-link:true by scope:link with no more results (not sure what the difference between both is)

I know this question is almost a dupplicate of this one

How can I add a route that is "on the link", directly connected to the interface even if the IPs are not the same?

However I found that the accepted answer does not work for me even for ipv4, unless I replace the 'scope: link' with 'on-link: true'

So questions:

  • Has anyone managed to make scoped link routes work with netplan + ipv6 ? If so what's wrong in the example above ?

  • Can someone explain what the difference is between scope:link and on-link:true ?

  • Why is a 'via' attribute mandatory for an onlink route ?

Regards

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It's possible you are being affected by a known bug in the Ubuntu 18.04 version of systemd-networkd, for which a fix is in progress. https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1812760

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