route traffic to different interface, from port

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http://serverfault.com – I got three gateways: on eth0 (default), on eth0:0 on eth0:1 I'm trying to make my computer decide on which to use, from the request port. (request comes server-side) exemple.com:80 -> via to exemple.com:80 exemple.com:81 -> via to exemple.com:80 exemple.com:82 -> via to exemple.com:80 how should I proceed ? thanks (HowTos)