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One of my Ubuntu servers always loses its default route when restarted. I have a second server which has an almost identical set up which works fine. I am not sure when the problem started but it first became an issue when we started auto patching so the servers get rebooted every month.

rful011@secesprd02:~$ ifconfig
bond0     Link encap:Ethernet  HWaddr f4:e9:d4:a0:6f:50  
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:27405882 errors:0 dropped:127 overruns:0 frame:0
          TX packets:11898380 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:38129519206 (38.1 GB)  TX bytes:14527843371 (14.5 GB)

bond0.1060 Link encap:Ethernet  HWaddr f4:e9:d4:a0:6f:50  
          inet addr:10.6.0.68  Bcast:10.6.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4349473 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2832180 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:36350288670 (36.3 GB)  TX bytes:13842264977 (13.8 GB)

and in /etc/networks/interfaces:

auto bond0
iface bond0 inet manual
    post-up ifenslave bond0 enp2s0f0 enp2s0f1
    pre-down ifenslave -d bond0 enp2s0f0 enp2s0f1
    bond-slaves none
    bond-mode 4
    bond-miimon 100
    bond-lacp_rate 0

auto enp2s0f0
iface enp2s0f0 inet manual

auto enp2s0f1
iface enp2s0f1 inet manual

auto bond0.1060
iface bond0.1060 inet static
    address 10.6.0.68
    netmask 255.255.255.0
    network 10.6.0.0
    broadcast 10.6.0.255
    gateway 10.6.0.254

These files are identical (except for the IP address) to the setup on the machine that works.

This is an important production server so I really don't want to go bouncing it often to test stuff ! Does anyone have any ideas on how to diagnose what is going on.

Russell Fulton
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  • Maybe while changing your update regimen you installed all available updates on one machine, but only security-pocket updates on the other? Compare `dpkg -l`! – anx Oct 18 '20 at 23:33
  • The updates are automated and not managed by me. There are numerous minor difference in package version which is odd and something I will take up with the the infrastructure folk. I think that only the security updates are being applied. – Russell Fulton Oct 19 '20 at 00:12

0 Answers0