Netplan on Ubuntu 18.04 sets incorrect default route metric for DHCP/RA advertised routes

[Alexey Savva]

We are running Ubuntu 18.04.

When netplan generates networkd configuration, it adds RouteMetric=100 to [DHCP] section of the interfaces. It overrides default networkd value of 1024 and gives priority to DHCP routes over static one. This breaks network on multi-homed hosts and blocking VM deployments on VMware platform.

From networkd man page:

UseRoutes=
When true (the default), the static routes will be requested from the DHCP server and added to the routing table with a metric of 1024, and a scope of "global", "link" or "host", depending on the route's destination and gateway.