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[Arun <sarun87@xxxxxxxxx>]

Public bug reported:

Connecting an external network to a router causes l3-agent to send out
gratuitous arp packets to to the external network gateway IP in order to
pre-populate the mac table without expecting a response. Similar
behavior when associating floating IPs. Arping utility on CentOS7.2
returns 0 when no response but returns 1 on Ubuntu14.04 which causes an
exception and thus a Traceback in the log files.

Changing arping command call to not check return code status fixes this
issue and that is the proposed fix.

Pre-conditions: Router with external network attached.

Step-by-step reproduction steps:
1) Create a router
2) Attach an external network as gateway.
3) Attach a tenant network to the router.
4) Associate a Floating IP to a VM instance powered on in that tenant network.

Expected output: No errors in logs. Seen on CentOS7.2
Actual output: Traceback in l3 log. Seen on Ubuntu14.04
http://paste.openstack.org/show/496284/

Version: Openstack Liberty (Tag: 7.0.2). Ubuntu14.04.
uname -a
Linux ubuntu01 4.2.0-27-generic #32~14.04.1-Ubuntu SMP Fri Jan 22 15:32:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Services running: l3-agent in dvr mode, ovs-agent, dhcp-agent, nova-
compute.

Perceived Severity: Medium (Causes issues with active monitoring)

** Affects: neutron
     Importance: Undecided
     Assignee: Arun (sarun87)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Arun (sarun87)

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https://bugs.launchpad.net/bugs/1578842

Title:
  gratuitous arping causes exception filling up logs with errors on
  Ubuntu14.04

Status in neutron:
  New

Bug description:
  Connecting an external network to a router causes l3-agent to send out
  gratuitous arp packets to to the external network gateway IP in order
  to pre-populate the mac table without expecting a response. Similar
  behavior when associating floating IPs. Arping utility on CentOS7.2
  returns 0 when no response but returns 1 on Ubuntu14.04 which causes
  an exception and thus a Traceback in the log files.

  Changing arping command call to not check return code status fixes
  this issue and that is the proposed fix.

  Pre-conditions: Router with external network attached.

  Step-by-step reproduction steps:
  1) Create a router
  2) Attach an external network as gateway.
  3) Attach a tenant network to the router.
  4) Associate a Floating IP to a VM instance powered on in that tenant network.

  Expected output: No errors in logs. Seen on CentOS7.2
  Actual output: Traceback in l3 log. Seen on Ubuntu14.04
  http://paste.openstack.org/show/496284/

  Version: Openstack Liberty (Tag: 7.0.2). Ubuntu14.04.
  uname -a
  Linux ubuntu01 4.2.0-27-generic #32~14.04.1-Ubuntu SMP Fri Jan 22 15:32:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  Services running: l3-agent in dvr mode, ovs-agent, dhcp-agent, nova-
  compute.

  Perceived Severity: Medium (Causes issues with active monitoring)

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