Port forwarding & NAT

linuxhasib · 02-07-2012, 11:32 PM

I need urgent help:

I need to forward a some ports on a real IP to private IP

ort

eth0: xxx:xxx:xxx:xxx (real IP)
eth1: 192.168.1.1
working environment: Redhat Linux 5

i need to forward
xxx:xxx:xxx:xxx:2500 to 192.168.1.20:443
xxx:xxx:xxx:xxx:2501 to 192.168.1.30:443
xxx:xxx:xxx:xxx:2502 to 192.168.1.40:443

so that port 443 on those 3 local IPs (...20,30,40) can be accessible
individually from real (out) world through xxx:xxx:xxx:xxx:250n

i tried this way:
iptables -t nat -I PREROUTING -i eth0 -d xxx.xxx.xxx.xxx --dport 2500 -
j DNAT --to 192.168.1.20:443

but it's not working, i need urgent solution... please help

scanray · 02-08-2012, 01:00 AM

use "A" not "I" in your line.

For me work like that:

iptables -t nat -A PREROUTING -p tcp -i eth0 --destination-port 2500 -j DNAT --to-destination eth1:443

good look