Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/21689

Log:
commit eb5e2668f327ec614f4cc4a68259ed72aba9b1c9
Author: Vishvananda Ishaya <vishvananda at gmail.com>
Date:   Mon Feb 11 12:08:35 2013 -0800

    Allow fixed to float ping with external gateway.
    
    If you ping an a floating ip from an instance with only a fixed ip, the
    traffic will be sent to the default gateway. If the default gateway has
    a route to the floating ip, it will then be sent to the host of the
    instance with the floating ip. The source address will be on the fixed
    network, so if the floating addresses are on a different network, the
    receiving host to drop the packet due to the default rp_filter.
    Essentially, the route for the fixed range is on a different interface
    so it the kernel assumes the packet is spoofed and drops it.
    
    In order to fix this issue this patch adds a new config option called
    force_snat_range. Traffic that originates in fixed_range and has a
    destination in force_snat_range will always be routed. This forces
    the packet to hit the fallback floating roule and be snatted to
    routing_source_ip. This means the traffic will originate from the
    proper network and the packet will make it through.
    
    DocImpact
    
    Fixes bug 1122335
    
    Change-Id: I7e31c25d37a5c4fd02c8238aec58a28af3fd7f6a