Public bug reported:
The version of systemd-networkd on Ubuntu Focal refuses to configure a
route due to the fact that the address of the gateway is outside of the
subnet of the NIC. The onlink option is required. This does not happen
on Jammy and Noble.
Steps to reproduce:
```
# ip a
2: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
group default qlen 1000
link/ether de:00:00:62:c5:e9 brd ff:ff:ff:ff:ff:ff
inet 212.47.xxx.xxx/32 scope global dynamic ens2
valid_lft 800sec preferred_lft 800sec
inet6 2001:xxx:xxx:xxxx:xxxx:xx:xxxx:c5e9/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::dc00:ff:fe62:c5e9/64 scope link
valid_lft forever preferred_lft forever
# cat /etc/netplan/50-cloud-init.yaml
version: 2
ethernets:
ens2:
addresses:
- 2001:xxx:xxx:xxxx:xxxx:xx:xxxx:c5e9/64
dhcp4: true
routes:
- to: 169.254.42.42/32
via: 62.210.0.1
- to: ::/0
via: fe80::dc00:ff:fe62:c5ea
# netplan apply
# journalctl -b -u systemd-networkd
...
Jul 18 10:05:59 focal systemd-networkd[668]: ens2: Could not set route: Nexthop
has invalid gateway. Network is unreachable
...
```
Is this something that netplan fixes and presents it in a better way to
networkd in newer versions? Or is this something that networkd improves
in newer versions?
cloud-init's upstream bug: https://github.com/canonical/cloud-
init/issues/5523
** Affects: cloud-init (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Affects: cloud-init (Ubuntu Focal)
Importance: Undecided
Status: New
** Affects: netplan.io (Ubuntu Focal)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: cloud-init (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Changed in: cloud-init (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2073869
Title:
systemd-networkd refuses to apply route with gateway out of the NIC's
subnet
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