On Thursday 04 December 2008 04:21, Indunil Jayasooriya wrote:
> Hi,
>
> I know these are a few iptbales questions. NOT CentOS, anyway, I am
> running a firewall on centos 5.x.
>
> If you can response, it would be fine.
>
>
> 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?
>
> And Also,
>
> 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?
>
> Hope to hear from you.
I take it the firewall has 2 interfaces WAN and LAN. Without knowing how you
have things setup now you could simple add the following:
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -i <LAN> -s 192.168.1.11 -j DROP
iptables -i <LAN> -s 192.168.1.19 -j DROP
iptables -i <LAN> -s 192.168.1.25 -j DROP
Should any of these ip's need access to the firewall then you nedd to place
those rules before these.
--
Regards
Robert
It is not just an adventure.
It is my job!!
Linux User #296285
http://counter.li.org
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