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tarabyte
Asked: 2024-10-24 08:09:55 +0800 CST

Add default route on physical interface using `systemd-networkd`

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In /lib/systemd/network/10-eth0.network on my client, I am failing to configure anything that can translate my manual command:

sudo ip route add default via 192.168.7.1 dev eth0

where 192.168.7.1 is the static IPv4 address of my host.

My last 10-eth0.network configuration attempt:

[Match]
Name=eth0

[Link]
RequiredForOnline=no

[Route]
Address=192.168.7.2/24
Destination=192.168.7.1/32
Gateway=192.168.7.1

Refreshed with sudo systemctl restart systemd-networkd and validated with ip route (it doesn't show up).

See also:

ip

1 Answers

  1. Best Answer

    You didn't specify anywhere that it's supposed to be the default route; instead you have Destination=192.168.7.1/32 – which is the complete opposite of a default route... as well as being a cyclical (self-referencing) route. According to your configuration, it probably shows up as a 192.168.7.1/32 dev eth0 in your route output (that would be the effective interpretation assuming the kernel doesn't reject it).

    The default route is always 0.0.0.0/0, i.e. a lowest-precedence catch-all route, and that's what you need to define as the Destination=. (Alternatively you can omit Destination= entirely.)

    A route via Gateway=192.168.7.1 can only be defined if you are in the same subnet. For that, make sure that the Address=192.168.7.2 parameter is either in an [Address] section or in the [Network] section – it makes no sense in the [Route] section.

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