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conntrack: document all-zero IP SNAT behavior and add a test case
Currently, conntrack in the kernel has an undocumented feature referred to as all-zero IP address SNAT. Basically, when a source port collision is detected during the commit, the source port will be translated to an ephemeral port. If there is no collision, no SNAT is performed. This patchset documents this behavior and adds a self-test to verify it's not changing. In addition, a datapath feature flag is added for the all-zero IP SNAT case. This will help applications on top of OVS, like OVN, to determine this feature can be used. Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
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