OpenVPN, Squid and two networks. How to setup routing?

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http://www.linuxquestions.org – Hi, i hope this is the right place to post this problem! I have a server with two different jobs, the first job is openvpn, the second is to be a proxy. The sever has two network interfaces with two different networks (internet connections). The first network is the internal network. This network has a 2 mbit internet connection with static ip which should be used to access the openvpn server. The second network is only a 16 mbit internet connection without staitc ip, this network should be used to access the internet (using the squid proxy). And now the problem: If i set the default gatewa (HowTos)