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How do I setup a NIC for outgoing connections and the other to serve my Squid proxy?

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linux-howto

http://serverfault.com – I have an internal network (192.168.2.0/24) that I'm supposed to connect to a proxy. I've already installed and test(with a little traffic) an Squid 3 cache/proxy server in a Ubuntu 12.04 box with this IP address: 192.168.2.102 eth0. Also, I have another physical NIC with IP 192.168.2.101 eth1. The setup that I've done consists in the Ubuntu box going out to internet and serving the Squid in the same eth0 NIC. I have the concern when the all traffic come, this lonely NIC can't handle it. So I want to setup the eth1 to go out to the internet and the other one to serve the proxy. (HowTos)