Config differents external proxy to every VM with iptables

Question

I have a virtualization server with one IP and 5 VM. To get internet access and ssh access in every VM I do this in

-------------/etc/network/interfaces-------

auto vmbr2 iface vmbr2 inet static address 192.168.0.254 netmask 255.255.255.0 bridge_ports none bridge_stp off bridge_fd 0 post-up echo 1 > /proc/sys/net/ipv4/ip_forward post-up iptables -t nat -A POSTROUTING -s '192.168.0.0/24' -o vmbr0 -j MASQUERADE post-down iptables -t nat -D POSTROUTING -s '192.168.0.0/24' -o vmbr0 -j MASQUERADE post-up iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 1022 -j DNAT --to 192.168.0.1:22 post-down iptables -t nat -D PREROUTING -i vmbr0 -p tcp --dport 1022 -j DNAT --to 192.168.0.1:22 

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This is ok. Now I need set a different external proxy to every VM. For example: VM 192.168.0.1 used this proxy user:[email protected]:3218 to access the internet.

How can I do it? Is it possible using only iptables?

Answer 1

Please clarify - what do you want.

At first - iptables work only with packets. It can't set user and password for proxy.

But you can set redirect traffic from each VM(it's ipadress) to each own proxy server. I think iptables -t nat -A PREROUTING -i eth0 -s vm_ipaddress -p tcp —dport 80 -j DNAT —to proxy_ipaddress:port should help you.