simple bind and redirect example, please
I have a win2k running exchange and iis, i need to redirect ports for smtp, pop3 and http to my win2k server. i have 1 public ip address, and so everyone including the 2k server is NATing through the RH9 box. I've never done this before, and a simple example would be useful. Thank you in advance.
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assuming 2.4.x kernel: read this, http://www.tldp.org/HOWTO/IP-Masquer...4.X-PREROUTING
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sparing u the security speech:
1. enable ip forwarding #echo 1 > /proc/sys/net/ipv4/ip_forward 2. make a NAT/MASQ rule #iptables -A POSTROUTING -t nat -s $LAN -j MASQUERADE (for a dynamic ip) OR #iptables -A POSTROUTING -t nat -s $LAN -j SNAT --to $NET_IP (if u have a static ip to internet) where: LAN=192.168.0.0/24 (or similar) NET_IP=1.2.3.4 (your real IP to masquerade as) with no other firewall rules setup, that should get you started with NATing for redirecting ports 25 and 80 (aka port forwarding): #iptables -A PREROUTING -t nat -p tcp --dport 25 -j DNAT --to $WINBLOWS_SERVER #iptables -A PREROUTING -t nat -p tcp --dport 80 -j DNAT --to $WINBLOWS_SERVER and the same for the pop3 port where: WINBLOWS_SERVER=192.168.0.200 (or whatever the internal IP of it is). |
I strongly suggest you read the article. It'll teach you how it works. If you just paste Robert's commands, you aren't learning anything. Linux is all about learning ;) Have fun.
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