[strongSwan] CPU loadbalancing and odd IP address

[Valérie P]

Hi,

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
10.0.0.2 on my WAN interface, and it falls back to 0.3% of use when the IP
address is 10.0.0.1 (odd). Same results with 10.0.0.3.
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?

Regards,

Val
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