[RndTbl] Routing questions

Mike Pfaiffer high.res.mike at gmail.com
Wed Jun 17 04:58:21 CDT 2009

Bill Reid wrote:
> Hi Mike,
> What you want to do goes way beyond what most low end routers are 
> designed to do. As you suggest the rules are applied to traffic coming 
> into the WAN port and not local traffic. Your proposal also is not just 
> IP routing but is also URL routing(i.e more like a proxy).

	I wasn't really thinking along the lines of a proxy. It makes sense 
though. While I was half asleep last night I was thinking it might be 
easy to connect a computer to the WAN port to pretend it's the internet. 
It could then redirect all traffic back to the web server on the LAN. 
Maybe this is what Sean was talking about. I'm not sure.

> The port 80 redirect is available in the mods to the Linksys router via 
> firmware replacement(an exmaple is openwrt.org)

	I can see how that would be useful in this situation. It could be 
redirected and fail with a 404 which could be redirected to the info page.

	I'm using a D-Link 655. Would that make a difference?

> -- Bill
> Mike Pfaiffer wrote:
>>     The set-up to the question is I picked up a decently modern 
>> wireless router to play with. I allow no connection to the internet 
>> (nothing in the WAN port). I have a couple of computers I can connect 
>> to the wired ports of the router (assign static IPs within the subnet 
>> but outside the DHCP range). These machines (both *NIX boxes) will 
>> provide services such as a web server and a mud/game server. The 
>> router will allow open access to anyone who wants to connect (I want 
>> to provide my own content for experimentation). Since I have physical 
>> control of the hardware I'm not too worried about security.
>>     Initially I'd like to be able to redirect all http traffic not 
>> bound for my web server to my web server. For example someone trying 
>> to get to Google will get my info page instead. But if someone were 
>> trying to access a different page on the same machine would still be 
>> able to connect.
>>     I've done the RTFM thing and got confused. The manual seems to 
>> dance around the issue but doesn't seem to say anything which looks to 
>> be appropriate. The firewall is used mainly to filter incoming (from 
>> the WAN port) traffic. IP filters control the outbound (to the WAN 
>> port) filtering. The routing page talks about routing requests to a 
>> specific IP outside the LAN side. Virtual servers route requests from 
>> the WAN side to a specific LAN address. The port forwarding section 
>> looked more like an extension to the firewall page.
>>     Here is what I'd like to do graphically.
>> Rule 1:
>> LAN requests non-192.168.X.Y web page --> Router says "You must mean 
>> 192.168.X.Y" --> Router sends traffic to 192.168.X.Y/index.html
>> Rule 2:
>> LAN requests 192.168.X.Y/whatever.html --> Router passes along the 
>> request to 192.168.X.Y web server
>>     The question is how can I do this? I know I've missed something, 
>> but the manual didn't seem to help. I'll admit to not checking Google, 
>> but I'm not sure what search terms to use.
>>     This ties in with the wireless questions I was asking a couple of 
>> months ago. After I get this working I'll be looking at authentication 
>> for other services and extending the range of coverage.
>>                 Later
>>                 Mike
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