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Netopia DSL Modem/Router Static IPs vs. Lan IPs

Posted on 2003-11-01
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I have a Netopia Cayman 5700 series DSL modem/router. My ISP is SBC. I have 1 wan IP and 5 assigned LAN IPs. I was told that these 5 assigned IPs were accessible publicly. My question is, why would they give me 5 static LAN IPs? As far as I knew, the LAN IPs were not accessible publicly because of that NAT sharing the WAN IP. Why would they give me 5 LAN IPs that I can just make up using the whole range from 2-255?  It's like they want me to pay for more LAN IPs if I have more than 5 computers, when I don't even need to use their assigned LAN IPs in the first place. I have tried setting one of the computers to one of these Static LAN IPs and then pinging it from a public computer through another connection. The static IP doesn't respond, as though it never got the ping, and therefore, isn't public at all. Maybe someone else knows how SBC works and why they operate the way they do. I asked why I am not just assigned another WAN IP that I can bind to a specific local IP, and they just said "that's not how we do it anymore." SBC employees who I talked to were complete BASTARDS. I know you guys will answer this question without a problem. Thanks for the help.
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Question by:induced
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by:svenkarlsen
ID: 9665628
Try checking the docunemtation that came with the router.

Often the ISP will configure the router so that 5 LAN hosts will be accessible from public internet, but this doesn't mean that they assign public addresses. They do it by using a principle called PAT (Port-Address-translation).

If this is the case for you, the following setup should apply (only as example, - actual port-to-IP mapping should be in your documentation):

Anyone from public calling http://[your WAN address] will be routed to your internal PC with an internal IP of e.g. 192.168.1.3.

In this way you can setup your own: mail, www, ftp, dns, telnet, etc..
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by:induced
ID: 9669398
I tried using the Netopia Router mapping one of those IP's they gave me to a specific local IP, but it told me the IP I used (which they gave me), was an invalid IP. . . Has anyone with SBC and Static IP service run into this issue?
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svenkarlsen earned 375 total points
ID: 9670135
You should not use he local IP in your call, but your public.

Example:
 - Let's say that your ISP has mapped your local IP 192.168.1.3 for web-services.
 - Let's say that you have configured a PC with the fixed IP 192.168.1.3 and installed a webserver
 - Let's say that your public IP is 10.10.10.10.

Then, from any PC somewhere outside your router, you should be able to browse the webserver
by writing one of the above texts in your webbrowsers address-field:

    http://10.10.10.10

or

   10.10.10.10:80


The two texts mean the same to the webbrowser: if you put 'http://' in front of an address, you actually tell the browser to use 'port 80 on the target address, - i.e. the same as writing [address]:80.

Internally (on your local network), you use the actual address of the webserver when you need to access it, - i.e. either http://192.168.1.3 or 192.168.1.3:80 (for this example only, of course).

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by:induced
ID: 9673594
Thanks
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by:svenkarlsen
ID: 9674652
No worries, mate ;-)
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