Open Stack

** Also affects: openstack-manuals
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1360260

Title:
  'allow_same_net_traffic=true' has no effect

Status in OpenStack Compute (Nova):
  New
Status in OpenStack Manuals:
  New

Bug description:
  environment: Ubuntu trusty, icehouse from repos. 
  Setup per 'Openstack Installation Guide for Ubuntu 12.04/14.04 LTS' 

  **brief**

  two instances X and Y are members of security group A. Despite the
  following explicit setting in nova.conf:

  allow_same_net_traffic=True

  ...the instances are only allowed to communicate according to the
  rules defined in security group A.

  
  **detail**

  I first noticed this attempting to run iperf between two instances on
  the same security network; they were unable to connect via the default
  TCP port 5001.

  They were able to ping...looking at rules for the security group they
  are are associated with, ping was allowed, so I then suspected the
  security group rules were being applied to all communication, despite
  them being on the same security group.

  To test, I added rules to group A that allowed all communication, and
  associated the rules with itself (i.e. security group A) and voila,
  they could talk!

  I then thought I had remembered incorrectly that by default all
  traffic is allowed between instances on the same security group, so I
  double-checked the documentation, but according to the documentation I
  had remembered correctly:

  allow_same_net_traffic = True (BoolOpt) Whether to allow network
  traffic from same network

  ...I searched through my nova.conf files, but there was no
  'allow_same_net_traffic' entry, so the default ought to be True,
  right? Just to be sure, I explicitly added:

  allow_same_net_traffic = True

  to nova.conf and restarted nova services, but the security group rules
  are still being applied to communication between instances that are
  associated with the same security group.

  I thought the 'default' security group might be a special case, so I
  tested on another security group, but still get the same behaviour.

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