[strongSwan] CPU loadbalancing and odd IP address

Valérie P lagomvp at gmail.com
Thu Apr 28 16:21:06 CEST 2016


I am testing the Strongswan solution between two servers in my lab.
OS : Ubuntu 14.04
StrongSwan : 5.1.2

I observed today weird behaviour of our StrongSwan server when an even IP
address is used on the WAN interface. Half of my CPUs are full when I used on my WAN interface, and it falls back to 0.3% of use when the IP
address is (odd). Same results with
I tried different mix (even to odd, odd to odd, even to even) on both
servers. The behaviour is reproducible.

Random information :
- irqbalance is enabled
- servers are AESNI capable

Did any of you ever experience such behaviour? Should the use of an odd IP
address on the WAN interface be considered as a prerequisite?


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