[Bug 1768088] Re: can't activate 2 independent reachable interface

[Joseph Rafferty]

Further info: successive restarts of systemd-networkd or netplan apply
(which I've since learned simply generates files and restarts networkd)
applies the rule, following by the next immediate invocation removing
the rule, and so on.

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Title:
  can't activate 2 independent reachable interface

Status in netplan.io package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  ubuntu: 18.04
  systemd:   
  Installed: 237-3ubuntu10
  Candidate: 237-3ubuntu10
  netplan.io:
    Installed: 0.36.1
    Candidate: 0.36.1

  network:
    version: 2
    renderer: networkd
    ethernets:
      ens3:
        addresses: [192.168.3.30/25]
        dhcp4: no
        routes:
         - to: 0.0.0.0/0
           via: 192.168.3.1
           metric: 100
           table: 101

        routing-policy:
         - from: 192.168.3.0/25
           table: 101

      ens7:
        addresses: [192.168.5.24/25]
        dhcp4: no
        gateway4: 192.168.5.1
        nameservers:
          addresses: [1.1.1.1]

  this doesn't activate a proper rule for table 101:
  0:      from all lookup local
  32766:  from all lookup main
  32767:  from all lookup default

  in place of
  0:      from all lookup local
  32765:  from 192.168.3.0/25 lookup 101
  32766:  from all lookup main
  32767:  from all lookup default

  the file in /etc/systemd/network contains the correct information:
  [Match]
  Name=ens3

  [Network]
  Address=192.168.3.30/25

  [Route]
  Destination=0.0.0.0/0
  Gateway=192.168.3.1
  Metric=100
  Table=101

  [RoutingPolicyRule]
  From=192.168.3.0/25
  Table=101

  the ens3 is reachable from 3.0 but not from anywhere else

  with ifupdown on another system both interfaces would be reachable from everywhere on the private subnets.
  up ip route add default table 101 dev enp8s0 via 192.168.3.1
  up ip rule add from 192.168.3.0/25 lookup 101
  down ip rule del from 192.168.3.0/25
  down ip route del default table 101 via 192.168.3.1

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