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[Bug 1362651] Re: /0 subnet causes dhcp failures

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Fri, 03 Oct 2014 06:54:00 -0000
Reply-to: Bug 1362651 <1362651@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1362651

Title:
  /0 subnet causes dhcp failures

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in OpenStack Security Advisories:
  Won't Fix

Bug description:
  Neutron allow for creating /0 subnet. This alone does not make a lot
  of sense.

  It also causes DHCP failures as the agent is not able to start the dnsmasq process.
  Trouble is that the DHCP agent goes into perennial fully resync mode.
  This might cause huge delays in setting up DHCP for other subnets, thus resulting in a potential DoS.

  So it might be better to prevent /0 subnets at all.

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