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NAT Forwarding Issue
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Topic: NAT Forwarding Issue (Read 10145 times)
mboudro
Jr. Member
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Posts: 1
NAT Forwarding Issue
«
on:
Thursday 01 July 2010, 01:42:02 am »
I am trying to forward port 80 traffic to my internal web server which is located on the /24 subnet. I have an external static IP which is on the /29 subnet. I'm relatively well versed in firewalls so I proceeded to set up a DNAT rule to forward from the uplink to the internal server. I also set up firewall rules to allow port 80 into the internal network.
Unfortunately, the DNAT rule is not working as planned. I monitored the connections in the status section of the Endian system and I can see that the DNAT properly directs the packets but they end up being destroyed in the SYN_SENT state. In other words, the TCP packets are not getting a "handshake" (SYN/ACK) from the internal web server. This is also the same with a separate mail server operating on port 443.
Am I missing something simple here? I am currently using a Draytek router in production and it forwards all the ports without issue.
Thanks in advance for you help...
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Fungyo
Jr. Member
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Posts: 5
Re: NAT Forwarding Issue
«
Reply #1 on:
Friday 02 July 2010, 01:11:50 pm »
I had trouble with port forwarding when using Smoothwall. I would port forward from my Dynalink 1046vw to the Smoothwall machine and then port forward from the Smoothwall to the internal server. This didn't work. So I added my Smoothwall as a DMZ in the Dynalink and it worked.
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