> I want to add a SNAT rule for one user in LAN to access one particular > destination on the internet. > > Let's say www.centos.org > > I added the below rule. But . it does NOT work > Pls assume 1.2.3.4 is the real ip of the firewall. > ip address 192.168.101.230 is the client PC > > iptables -t nat -A POSTROUTING -o eth0 -s 192.168.101.230 -j SNAT > --to-source 1.2.3.4 -d www.centos.org > > Any idea to achieve it? The destination should be before the SNAT ... so try this: iptables -t nat -A POSTROUTING -o eth0 -s 192.168.101.230 -d www.centos.org -j SNAT --to-source 1.2.3.4 > the below rule excludes 1 ip. it works fine. > > iptables -t nat -A PREROUTING -p tcp -m multiport -s ! 192.168.1.9 > --destination-port 80,465,995 -j DNAT --to-destination :3128 > > I want to exclude about 4 or 5 ips. > > let's say 192.168.1.11, 192.168.1.19, 192.168.1.20,192.168.1.25 > > Is there a way to do it? Not that I can think of. If these IP addresses were in a contiguous block, it might be able to be summarized by one or two subnet statements instead of individual rules for each. Hope this helps. Barry