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DSL Modem has built-in firewall?

Posted on 2003-11-04
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Last Modified: 2013-12-14
I recently moved and changed DSL services to BellSouth.  The router i recieved was a Westell.  The problem is, I can't allow other users to recieve files from me, or have other users connect to my servers.  In XP, ipconfig shows my IP as 192.168.1.97, which im guessing is a network address.  The only way to get my real ip is to go to a site like "www.whatismyip.com" and check it.  I have a software firewall, Norton Internet Security, but know this is not the problem because it never did this on the last service and the problem still exists with it disabled.  Is there a way to disable the firewall on the modem to allow incoming connections?
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Question by:andy8pitts
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JFrederick29 earned 200 total points
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Do you have a router on your network?  or is your DSL plugging directly into your computer?  

If you do not have a router on your network, it sounds like the way your ISP has their network configured.  They are assigning you a private IP address via NAT.  The public IP address you see at www.whatismyip.com is not actually mapped to your computer therefore like you said people can not connect to your computer or servers.  If this is the case, you need to contact your ISP to have them provide you a pubic IP address or have them setup static mappings to your private IP address.
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by:andy8pitts
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Thanks for the response JFrederick29!  I do have a router, but it never did this with the old company, so i doubt it is the problem.  I guess the only thing to do is pay $5 more per month for a static ip :(...Thanks for the help!
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by:JFrederick29
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Well you could setup static NAT's on your router to map to your internal computers based on specific ports.  Take a look in your router to see if you can map based on ports.
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by:andy8pitts
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How would i know if this is possible to do, and how would i do it?
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by:JFrederick29
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What model of router do you have?  Let me know and I can maybe assist...

You could also look in the manual for the router, it should be under the NAT and PAT section.
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by:andy8pitts
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I seem to have misplaced the manual for the router...It's fairly old, a Networth Ethernext Microhub.  The model # is 0D100D52 . Thanks.
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by:JFrederick29
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Oh well that is a hub, not a router :)

You would have to buy a DSL router, then you could setup port forwarding.  Linksys is the most popular brand and is relatively cheap.  I would go that route then to buy a second static IP from your ISP.
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by:andy8pitts
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One more question...I need to change the channel for my wireless access point (D-Link DWL-900AP+).  In the manual, it says to connect to it through http://192.168.0.50/ in a web browser.  I try it, and get the "page cannot be found" message.  I cannot connect to this through a wired pc into the hub, nor with a computer wirelessly connected through the Access Point.  Is there a way to view all IP's used by a network to figure out which one it is assigned to?
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by:JFrederick29
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I know its tedious but you could ping starting at 192.168.0.1 and work your way up the range.  Are you able to ping 192.168.0.50 or does it time out?
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by:andy8pitts
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Request timed out.

It's timing out on 192.168.0.50...I also tried pinging everything from 192.168.0.1 to 192.168.0.100 with no success...Any suggestions?
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by:JFrederick29
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Maybe you could reset your access point to its factory settings.  Of course this will erase any configuration you have done on it if any.  The manual should explain how to do that.  Once you reset the access point, you could try connecting to 192.168.0.50 again.
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by:andy8pitts
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Tried doing a hard reset (hold reset button on back of AP for 30 seconds)...Didn't help....
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by:JFrederick29
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Are you trying to access it wirelessly or are you plugging into it?  Try plugging into it and see if that works.  Also, although its a pain, I would ping from 192.168.0.100-254 to complete the range.  Not sure if it is a communication problem though between your computer and the access point.  Hard to say...
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by:andy8pitts
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Tried plugging directly into the port in the back of the AP from my computer.  Nothing...I'll try pinging the higher numbers...Thanks.
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