Solved

Netopia DSL Modem/Router Static IPs vs. Lan IPs

Posted on 2003-11-01
5
1,117 Views
Last Modified: 2013-12-14
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.
0
Comment
Question by:induced
  • 3
  • 2
5 Comments
 
LVL 9

Expert Comment

by:svenkarlsen
Comment Utility
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..
0
 

Author Comment

by:induced
Comment Utility
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?
0
 
LVL 9

Accepted Solution

by:
svenkarlsen earned 125 total points
Comment Utility
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).

0
 

Author Comment

by:induced
Comment Utility
Thanks
0
 
LVL 9

Expert Comment

by:svenkarlsen
Comment Utility
No worries, mate ;-)
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Cable Modem Provisioning from DPoE compliant server  This Article is to support CMTS administrators to provide an overview of DOCSIS compliance configuration file, and to provision a cable modem located at customer place from a Back office serve…
Sometimes you have to pull out old tricks to get a new firewall to work… While we were installing a new Sonicwall at a customers site we found that sites they were able to visit before were not working.  It seemed random and we could not understa…
Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now