This route was needed to reach pergamon (debian.softwareheritage.org)
from VLAN1300 when pergamon was still on VLAN210
https://inventory.internal.softwareheritage.org/ipam/prefixes/1/ip-addresses/
The swh repository was not reachable from all the nodes
attached to the VLAN1300 (moma/kafka/...), probably since the last
reboot of pergamon.