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I recently set up a server with its network managed directly by systemd-networkd (nuked netplan.io and Network Manager) and gave it static IPs like this:

/etc/systemd/network/10-ethernet.network

[Match] Name=eno1 [Network] Address=192.168.1.2/24 Gateway=192.168.1.1 DNS=192.168.1.1

After restarting systemd-networkd.service, default routes look like this:

default via 192.168.1.1 dev eno1 proto static default via 172.16.0.1 dev eno2 proto static default via 172.31.255.1 dev eno3 proto static ^^^

Because there are multiple NICs and I want to make eno1 the preferred one, I want the routes laid out like this:

default via 192.168.1.1 dev eno1 proto static metric 100 default via 172.16.0.1 dev eno2 proto static metric 300 default via 172.31.255.1 dev eno3 proto static metric 500 ^^^^^^^^^^

Without the metric value, it default to 0, meaning all routes have the same priority (highest), which I want to avoid.

I've tried this setting:

[Route] Gateway=192.168.1.1 Metric=100

But it only generates an extra route with the desired metric while the original ones (missing metric) still remaining.

I'm running on Systemd 240. How should I achieve this?

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  • Wait, I've started a bounty, but maybe I misunderstand the question. What happens if you only specify one of the two Gateways, on either [Route] or [Network]? Commented Dec 22, 2019 at 6:25

1 Answer 1

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In this thread you can see the developers talking about how things work vs. how things should work: https://github.com/systemd/systemd/issues/928

They give a couple examples:

Under the Route tag

[Route] Destination=192.168.0.0/24 Metric=2048

Under the DHCP tag

[DHCP] RouteMetric=1024

It is explained that:

subnet routes are configured with no metric via address_configure in networkd-address.c when obtaining an IP and dhcp-provided routes with metric are processed later via link_set_dhcp_routes in networkd-dhcp4.c

Further there is a caveat:

the RouteMetric works for routed packets, but not for those that remain on the local subnet

It's possible that the exact functionality you want doesn't exist yet as the ticket I cited is currently open. Feel free to give feedback directly to the developers and join the discussion if you think you have an idea about how this should be working.

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