noironetworks
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opflex
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2071
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Fix nat rules priority across all routed prefixes. (#381) This is a rework of https://github.com/noironetworks/opflex/commit/aee03cc20 By giving nat flows +1 prio, does not fully solve the problem. we can have another routed prefix that would fall at the same priority as the nat one and if the subnets are overlapping the packets would take the non nat path. In bosch they had nw_dst=10.128.0.0/9 non-nat nw_dst=10.0.0.0/9 non-nat nw_dst=10.0.0.0/8 nat with current code this would result in all the 3 flows to use prio=159 which makes it non deterministic and back to the original problem we had. I took this approach initially because we did not have a big enough hole for all the priorities esp for v6. But since it does not work the fix considered 2 designs - assign nat priorities dynamically based on subnet/prefix of existing routed flows. - move ext subnet routed prio down from 150 to 40 to create a window big enough to satisfy v6. The first approach needs tracking subnet/prefix and dynamically computing overlapping nat subnet/prefix prio based on that. however as far as total priorities we might need in worst case goes its same as the second approach. Signed-off-by: Madhu Challa <challa@gmail.com>
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Travis Job 2071.1 |
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