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Old 08-25-2003, 03:59 PM   #1
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Question 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.
Old 08-25-2003, 07:28 PM   #2
Registered: Mar 2003
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assuming 2.4.x kernel: read this,
Old 08-26-2003, 04:30 AM   #3
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Registered: Apr 2002
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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)
#iptables -A POSTROUTING -t nat -s $LAN -j SNAT --to $NET_IP (if u have a static ip to internet)


LAN= (or similar)
NET_IP= (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

WINBLOWS_SERVER= (or whatever the internal IP of it is).
Old 08-26-2003, 08:43 AM   #4
Registered: Mar 2003
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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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