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[Bug 1176947] Re: Improve logic for nvp plugin nat rules ordering

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 29 May 2013 11:09:04 -0000
Reply-to: Bug 1176947 <1176947@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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https://bugs.launchpad.net/bugs/1176947

Title:
  Improve logic for nvp plugin nat rules ordering

Status in OpenStack Quantum (virtual network service):
  Fix Released

Bug description:
  NAT rule ordering for the nicira plugin is currently trivial. A higher
  order is assigned to floating IP rules whereas a lower order is
  assigned to default SNAT rules.

  A better logic would leverage the cidr prefix, establishing the rule order as MAX_ORDER - PREFIX_LEN.
  In this way, floating IP rules (/32) will still have highest priority.

  This will also avoid problems with deployments upgraded from 2.x to
  3.x where NAT rules order are rearranged according to this logic.

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