Need help understanding static routing with Comcast IP Gateway

Need help understanding static routing with Comcast IP Gateway
NewsGroups | Search | Tools
User Password
Register Now! Lost Password?
 comp.dcom.modems.cable  Post an article  get this group's latest topics as an RSS feed add this group's latest topics to your My MSN content add this group's latest topics to your My Yahoo content  add this group's latest topics to your Google content  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
Need help understanding static routing with Comcast IP Gateway Mike Brophy 11-24-2006
Posted by Mike Brophy on November 24, 2006, 5:51 pm
If you were  Registered and logged in, you could reply and use other advanced thread options
I got my Comcast Business IP Gateway today with 5 static IP addresses.
My IP Gateway is the SMC 8014.

I have several servers in my network which I want to expose to the
internet; I don't want to simply port forward but rather if a request
comes in for static IP x.x.x.249 on port 80, I want it routed to my Web
Server #1. Likewise, if a request comes in on static IP x.x.x.250 on
port 80, I want it routed to my Web Server #2. You see where simple
port forward fails in this scenario because I could have port 80
requests coming in but each is for a different server.

My question is that I don't understand how to set this up in my IP
Gateway (there is no manual and Comcast tech support was useless).

Thanks for any help.

Mike
Seattle


Posted by Dana on November 24, 2006, 9:58 pm

> I got my Comcast Business IP Gateway today with 5 static IP addresses.
> My IP Gateway is the SMC 8014.
>
> I have several servers in my network which I want to expose to the
> internet; I don't want to simply port forward but rather if a request
> comes in for static IP x.x.x.249 on port 80, I want it routed to my Web
> Server #1. Likewise, if a request comes in on static IP x.x.x.250 on
> port 80, I want it routed to my Web Server #2. You see where simple
> port forward fails in this scenario because I could have port 80
> requests coming in but each is for a different server.
>
> My question is that I don't understand how to set this up in my IP
> Gateway (there is no manual and Comcast tech support was useless).
>
> Thanks for any help.

Hi.
Look up NAT, network address translation.

>
> Mike
> Seattle
>



Posted by DLR on November 25, 2006, 9:49 am
Mike Brophy wrote:
> I got my Comcast Business IP Gateway today with 5 static IP addresses.
> My IP Gateway is the SMC 8014.
>
> I have several servers in my network which I want to expose to the
> internet; I don't want to simply port forward but rather if a request
> comes in for static IP x.x.x.249 on port 80, I want it routed to my Web
> Server #1. Likewise, if a request comes in on static IP x.x.x.250 on
> port 80, I want it routed to my Web Server #2. You see where simple
> port forward fails in this scenario because I could have port 80
> requests coming in but each is for a different server.
>
> My question is that I don't understand how to set this up in my IP
> Gateway (there is no manual and Comcast tech support was useless).

I'm betting they gave you a modem/router unit. I'll assume it has 1
ethernet port. If not you can simplify a bit.

SMC
|
|
5 port switch (you supply)
|
+---- first computer / server with IP set to one of your static IPs
|
+---- second computer / server with IP set to one of your static IPs
|
+---- third computer / server with IP set to one of your static IPs
|
+---- fourth computer / server with IP set to one of your static IPs
| |
+---- A router doing NAT to handle other "user" computers

This would give you 4 servers plus as many non-servers as your router
can handle.

There are a LOT of other ways to do this and your needs are not entirely
clear but this is one way. The key is to set the IP address of the
server computers AND the router to a different one of the IP addresses
give to you by Comcast. If you allow them to "get an IP" they will get
different ones over time and mess up your server plans.




Similar ThreadsPosted
Dynamic vs Static I/P with Comcast? September 23, 2006, 10:15 am
Help me with GATEWAY April 26, 2006, 3:33 am
routing demon broadband connection with a Mercury ART514CX - help! August 9, 2005, 9:57 am
routing demon broadband connection with a Mercury ART514CX - help! August 9, 2005, 8:28 pm
New To Broadband- hooking up PC- Gateway (2year old machine) March 15, 2005, 1:18 pm
The ISP giving leased line to home(cat5), wants to configure static private IP addr, can I use Router?. October 1, 2005, 5:14 am
Re: IMPORTANT!! ALL COMCAST Subscribers!! PLZ READ! COMCAST COMCAST November 1, 2006, 11:36 am
Re: IMPORTANT!! ALL COMCAST Subscribers!! PLZ READ! COMCAST COMCAST November 6, 2006, 2:04 pm
Comcast November 15, 2005, 5:33 pm
What is it with Comcast DNS September 17, 2006, 4:46 pm

other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

Custom CGI Perl and PHP programming by 1-Script.com

Contact Us | Privacy Policy
The site map in XML format XML site map