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There is a firewall/gateway machine with eth0 Public and eth1 Private network (192.168.1.0).

I would like to block all OUTPUT connections for private users (eth1) except couple of networks like: 123.123.123.0/24, 91.12.31.0/24 etc. as they are in our city network.

There are a lot of questions here about iptables but I couldn't find a way to resolve this issue.

It might also happen that some user, say, 192.168.1.10 would not be restricted to those networks.

If I do:

IPTABLES -P OUTPUT DROP
IPTABLES -A OUTPUT -d 123.123.123.0/24 -s 192.168.1.51 -j ACCEPT
...that would make me adding rules per user multiplied by number of networks

So is there any way to GROUP those city networks as well?

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Sounds to me that what you want is ipsets. Here is link that human beings can read. For installation, if you are on Fedora take a look at this And if on Ubuntu look at this.

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