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

[Tobias Wolf]

We are also affected by this suddenly after systemd upgrade the network
was gone, had to go in via serial console.

We are only using networkd because Martin Pitt said in the run-up to the
16.04 release that networkd would be supported and to be used in the
next LTS release.


# networkctl
IDX LINK             TYPE               OPERATIONAL SETUP     
  1 lo               loopback           carrier     unmanaged 
  2 eth0             ether              carrier     configured
  3 eth1             ether              carrier     configured
  4 eth2             ether              carrier     configured
  5 eth3             ether              carrier     configured
  6 eth4             ether              no-carrier  configured
  7 eth5             ether              no-carrier  configured
  8 bond0            ether              off         unmanaged 
  9 bond1            ether              routable    configured

9 links listed.


# head /etc/systemd/network/* -n 20
==> /etc/systemd/network/bond1.netdev <==
[NetDev]
Name=bond1
Kind=bond

[Bond]
Mode=802.3ad
MIIMonitorSec=100
TransmitHashPolicy=layer3+4
LACPTransmitRate=1

==> /etc/systemd/network/bond1.network <==
[Match]
Name=bond1

[Link]
MTUBytes=9000

[Network]
LinkLocalAddressing=no

[Network]
Address=10.230.0.4/22
Gateway=10.230.0.1

==> /etc/systemd/network/eth.network <==
[Match]
Name=eth*

[Network]
Bond=bond1

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1727301

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

Status in systemd package in Ubuntu:
  Confirmed

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1727301/+subscriptions