More network interfaces

Hello!
I have a little bit more complicated situation. 
eth0, eth1 - are WAN interfaces
eth2, eth3, eth4 - are LAN interfaces

Is it possible to run 3 instances of siproxd when I have 2 WAN interfaces? 
As far as I understand I can run few instances of siproxd, they just have to 
use different pid files. Am I right?

Tia.
Krzysztof "Xyo" Dendra

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