[Bug 1727301] Re: 229-4ubuntu20 added ARP option breaks existing bonding interfaces

[Dimitri John Ledkov]

How are eth0/eth1/bond0 configured?
Do you use netplan and networkd?
Do you use ifupdown?

Can you paste the output of $ networkctl?

Copies of the configuration e.g.:

/etc/network/interfaces
/etc/network/interfaces.d/*
/etc/netplan/*
/run/systemd/network/*
/etc/systemd/network/*

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Title:
  229-4ubuntu20 added ARP option breaks existing bonding interfaces

Status in systemd package in Ubuntu:
  New

Bug description:
  this breaks existing configurations with bonding on upgrading from
  229-4ubuntu19 to 229-4ubuntu20 on xenial

  as bond interfaces are now by default configured without ARP. Hence
  you suddenly lose network connectivity on upgrade. Very bad for a SRU.

  Plus adding "ARP=yes" to the Link section of a .network file does not
  work.

  Before this update, bond interfaces (specifically 802.3ad) were
  defaulting to ARP enabled. After the upgrade, they are created with
  NOARP set on the link.

  pre-upgrade:

  eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>
  eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>
  bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP>

  post-upgrade:
  eth0: <BROADCAST,MULTICAST,NOARP,SLAVE,UP,LOWER_UP>
  eth1: <BROADCAST,MULTICAST,NOARP,SLAVE,UP,LOWER_UP>
  bond0: <BROADCAST,MULTICAST,NOARP,MASTER,UP,LOWER_UP>

  Linux cnode11 4.4.0-97-generic #120-Ubuntu SMP Tue Sep 19 17:28:18 UTC
  2017 x86_64 x86_64 x86_64 GNU/Linux

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