[Bug 1923686] Re: Ubuntu 20.10 Network Issue

[Launchpad Bug Tracker]

[Expired for systemd (Ubuntu) because there has been no activity for 60
days.]

** Changed in: systemd (Ubuntu)
       Status: Incomplete => Expired

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Title:
  Ubuntu 20.10 Network Issue

Status in systemd package in Ubuntu:
  Expired

Bug description:
  I have a server running Ubuntu 20.10 running VMware Workstation 16
  which loses its default route. I keep setting it manually but every 30
  minutes or so, it reverts to the incorrect route.

  This server has 5 (4 used) GigE ports on different VLANs. Each of the
  4 ports is connected to a Cisco switch which applies the proper tag
  for that VLAN so that traffic can be routed correctly.

  I have tried disabling netplan and setting up interfaces in
  /etc/network/interfaces with the proper default route. But vmnetbrdige
  resets them every 30 minutes or so, adding routes for each interface
  which results in the incorrect default route.

  I have read of similar problems in Ubuntu 16.04 and 20.04 with a fix
  which claims to have corrected related problems, but not my issue.

  I had this server on CentOS 6 before and everything was work as
  expected.

  Below are the details.
  Contents of /etc/network/interfaces:
  iface eth1 inet static
          address 10.0.1.6
          netmask 255.255.255.0
          gateway 10.0.1.1
          dns-nameservers 8.8.8.8, 75.75.76.76
          dns-search mydomain.local
          up route add -net 0.0.0.0 netmask 0.0.0.0 gw 10.0.1.1 dev eth0

  iface eth2 inet static
          address 10.0.20.60
          netmask 255.255.255.0
          gateway 10.0.20.1

  iface eth3 inet static
          address 10.0.4.60
          netmask 255.255.255.0
          gateway 10.0.4.1

  iface eth4 inet static
          address 192.168.3.60
          netmask 255.255.255.0
          gateway 192.168.3.1

  Output of ifconfig -a:
  eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
          inet 10.0.1.60  netmask 255.255.255.0  broadcast 10.0.1.255
          inet6 fe80::264b:feff:fe5a:3622  prefixlen 64  scopeid 0x20<link>
          ether 24:4b:fe:5a:36:22  txqueuelen 1000  (Ethernet)
          RX packets 17216  bytes 14604772 (14.6 MB)
          RX errors 0  dropped 1283  overruns 0  frame 0
          TX packets 14670  bytes 1719546 (1.7 MB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
          device memory 0xfc600000-fc61ffff

  eth2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
          inet 10.0.20.60  netmask 255.255.255.0  broadcast 10.0.20.255
          inet6 fe80::226:55ff:fed7:d054  prefixlen 64  scopeid 0x20<link>
          ether 00:26:55:d7:d0:54  txqueuelen 1000  (Ethernet)
          RX packets 3159  bytes 212180 (212.1 KB)
          RX errors 0  dropped 1426  overruns 0  frame 0
          TX packets 1691  bytes 122628 (122.6 KB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
          device interrupt 106  memory 0xfca00000-fca20000

  eth3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
          inet 10.0.4.60  netmask 255.255.255.0  broadcast 10.0.4.255
          inet6 fe80::226:55ff:fed7:d057  prefixlen 64  scopeid 0x20<link>
          ether 00:26:55:d7:d0:57  txqueuelen 1000  (Ethernet)
          RX packets 3835  bytes 249203 (249.2 KB)
          RX errors 0  dropped 1408  overruns 0  frame 0
          TX packets 370  bytes 31235 (31.2 KB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
          device interrupt 115  memory 0xfc820000-fc840000

  eth4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
          inet 192.168.3.60  netmask 255.255.255.0  broadcast 192.168.3.255
          inet6 fe80::226:55ff:fed7:d056  prefixlen 64  scopeid 0x20<link>
          ether 00:26:55:d7:d0:56  txqueuelen 1000  (Ethernet)
          RX packets 2973  bytes 211765 (211.7 KB)
          RX errors 0  dropped 1433  overruns 0  frame 0
          TX packets 238  bytes 29345 (29.3 KB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
          device interrupt 117  memory 0xfc800000-fc820000

  lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
          inet 127.0.0.1  netmask 255.0.0.0
          inet6 ::1  prefixlen 128  scopeid 0x10<host>
          loop  txqueuelen 1000  (Local Loopback)
          RX packets 119  bytes 17075 (17.0 KB)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 119  bytes 17075 (17.0 KB)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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