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aglabs
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Posts: 39
Joined: Mon Dec 28, 2020 1:05 am

7.5 l3 hw nat is broken on CCR2116

Thu Sep 01, 2022 5:49 am

Pulling this thread out of the 7.5 release thread incase others run into the problem.
References from 7.5 release thread:
viewtopic.php?t=188851#p954807
viewtopic.php?t=188851#p954814
After applying 7.5 on a CCR2116, a large percentage of packet drops occur on source natted flows. Non natted flows are unaffected and seem fine.

Starting Torch, disabling l3 hw offload, or reverting to 7.4.1 appear to correct the behavior. I opened a support case as a result: SUP-91363 if anyone needs a reference.

Update 1:
Further testing in a lab CCR2116 where I can control routing more accurately. The issue is reproducible with source nat with masquerade configured. In a lab environment where I can turn NAT on/off without changing flow of traffic routing wise. I found after a short period of time of nat rule enabled, the issue will occur. Seems to affect all traffic that is offloaded and source nat, regardless of protocol. Traffic that is offloaded but not source nat has no loss which I can confirm by disabling nat firewall rule close existing connections, packet loss disappears for new connections. If i close connections again, and re-enable nat rule, packet loss is back. - All of this done w/o disable l3hw offload on switch config.
 
aglabs
newbie
Topic Author
Posts: 39
Joined: Mon Dec 28, 2020 1:05 am

Re: 7.5 l3 hw nat is broken on CCR2116

Fri Sep 02, 2022 4:45 pm

Got an update from support, they were able to reproduce the issue. A fix is coming but timeline is unknown yet. (It is not fixed in 7.6beta4)
 
ajgnet
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Posts: 35
Joined: Wed Apr 27, 2022 1:57 am

Re: 7.5 l3 hw nat is broken on CCR2116

Sat Sep 03, 2022 3:50 am

Reporting the same issue. Thanks for the update
 
aglabs
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Topic Author
Posts: 39
Joined: Mon Dec 28, 2020 1:05 am

Re: 7.5 l3 hw nat is broken on CCR2116  [SOLVED]

Wed Sep 07, 2022 5:08 pm

Was able to confirm 7.5BETA6 has the fix. I no longer see packet drops after applying the testing release.
viewtopic.php?t=188907#p955887
*) l3hw - fixed possible packet loss when using HW offloaded NAT;
 
ajgnet
newbie
Posts: 35
Joined: Wed Apr 27, 2022 1:57 am

Re: 7.5 l3 hw nat is broken on CCR2116

Wed Sep 07, 2022 7:34 pm

Working for me as well now. Thanks for the fast fix

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