Due to some network peculiarities involving VPNs and conflicting IP ranges, I have two subnets routing to two different interfaces. I would like to make one IP address in one subnet go out via a different gateway.

I can accomplish this by running:

```
$ route add -host 1.2.3.4 gw 5.6.7.8
$ ip route show
1.2.3.4 via 5.6.7.8 dev eth0 scope link 

```

I would like to make this change permanent. As I'm using systemd-networkd, I am trying to do this by updating the existing `/etc/systemd/network/50-dhcp.conf`:

```
[Match]
Name=eth0

[Network]
DHCP=ipv4

[Route]
#Gateway=5.6.7.8
Destination=1.2.3.4/32

```

This works, but without the `Gateway` line it doesn't set the route:

```
$ ip route show
1.2.3.4 dev eth0 proto static scope link

```

If I uncomment the `Gateway` line then the new route does not appear at all!

How can I specify a gateway when adding the static route using systemd-networkd?