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Home > Archive > Red Hat Topics > September 2005 > help iptables
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| junaidaslam 2005-08-29, 7:47 am |
| salam!!
My problem is i want to have one real ip. i want to re- direct all my
traffic comming on port 22 to 192.168.1.202 and trafic for port 21 to
192.168.1.203 where both the machines are within lan and on server i am
using squid.
Pleas help and if possible provide the iptable rule for this purpose
right now i am using but it is not working
tables -t nat -A PREROUTING -i eth1 -p udp --dport 21 -j DNAT
--to-destination 192.168.1.203
plz help!
Junaid
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| Duane Evenson 2005-09-18, 7:45 am |
| On Mon, 29 Aug 2005 00:53:43 -0700, junaidaslam wrote:
> salam!!
>
> My problem is i want to have one real ip. i want to re- direct all my
> traffic comming on port 22 to 192.168.1.202 and trafic for port 21 to
> 192.168.1.203 where both the machines are within lan and on server i am
> using squid.
>
> Pleas help and if possible provide the iptable rule for this purpose
> right now i am using but it is not working
>
> tables -t tables -t nat -A PREROUTING -i eth1 -p udp --dport 21 -j DNAT
> --to-destination 192.168.1.203
>
> plz help!
>
> Junaid
Your iptables rule looks OK. I assume its just a cut-and-paste error that
has yo displaying tables instead of iptables. I also assume eth1 is your
internet interface. I would include an extra option: "-d <gateway_IP>". So
it would look like:
iptables -t tables -t nat -A PREROUTING -i eth1 -p udp -d <gateway_IP>
--dport 21 -j DNAT --to-destination 192.168.1.203
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| Duane Evenson 2005-09-18, 7:45 am |
| On Sun, 18 Sep 2005 07:53:20 +0000, Duane Evenson wrote:
> On Mon, 29 Aug 2005 00:53:43 -0700, junaidaslam wrote:
>
> Your iptables rule looks OK. I assume its just a cut-and-paste error that
> has yo displaying tables instead of iptables. I also assume eth1 is your
> internet interface. I would include an extra option: "-d <gateway_IP>". So
> it would look like:
> iptables -t tables -t nat -A PREROUTING -i eth1 -p udp -d <gateway_IP>
> --dport 21 -j DNAT --to-destination 192.168.1.203
PS you do have ip_forward turned on?
echo 1 > / proc/sys/net/ipv4/ip_forward
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