X506 Config

We have a 3com x506 connected to a cable modem. The firewall has an internal IP on both the WAN and LAN interfaces. Everything works fine as far as our users connecting to the internet, but now I am trying to port forward into a server on our network. All of our computers are on the 192.168.x.x network. The lan port on the x405 is set to a 192.168.x.x ip The cable modem assigns a 10.1.10.x ip address to the wan port of the x506. When I try to forward in to the internal server, it times out after a few minutes. I'm thinking maybe it is the 10.1.10.x ip on the wan port. Should I change it to be 192.168.x.x ?

Thank you for helping!
heydudeAsked:
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jfradyCommented:
Do you have any control of the cable modem?  The X506 is a firewall and can do NAT.  Overall I would recommend having your public IP on the X506.  You can then define any port mappings you want.  Sounds like based on what you're saying that both the cable modem AND the X506 are doing NAT.  

The only way you could make that work would be to define port mappings in both the cable modem (which is really a router at the least since it is doing NAT) and the X506.
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heydudeAuthor Commented:
I have control over the cable modem. It is a Comcast business class modem (router). For some reason, I just can't get my mind around what I need to do to get it to work. I want to get the external IP on the external port of the X506, I just can't figure out how to do it.
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jfradyCommented:
You would need to setup the cable modem in bridge mode.  Then it would function as a modem only.  The IP assigned by your ISP would then be assigned (either statically or dynamically) to the X506.  The X506 would then have full control over any NAT settings.  
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