URL re-writing for local vs internet access

[leezer3]

I'm sure there's something simple I'm missing here, can't think on how to do this-
I've got an incredibly simple page of links, which can either be accessed from the local network, or over the internet (Unfortunately its a dynamic IP, otherwise things would be much simpler) The problem is that these links need to incorporate the port number, & protocol like this:

http://192.168.2.250:10000
https://192.168.2.250:10002

The port works both on the external DynDNS URL that I'm currently using (Mildly related- Anyone got a way to point a spare domain/ subdomain in the same way, using a Tomato WRT54GS?), or on the local IP. I'd rather not try to use the external URL, as this places a reliance on external DNS, but have the page dynamically re-write itself dependant on where its being accessed from.

Cheers

-Leezer-

 

[leezer3]

Not quite following your reasoning
I've got the my main public server structure (Apache, PHP5 SQL etc) running various bits and bobs to start with, this runs on port 80 as standard. Within this, I've added a separate password protected area with the management functions etc. linked from a single HTML page. These form the links as above, for which the port number & protocol may vary, depending on what is being linked to-
This stuff is normally web interfaces for various bits of kit (Transmission BT, NZB server, BackupPC etc), & as such has no interaction with the primary Apache server, but rather runs their own backend on an entirely separate port. I've also got SSH/ VNC links & other bits and peices, all of which have no fixed port.

Subdomain/ domain wise, I'm fully aware that I can point it to a specific IP, my trouble is that the IP in question in dynamic. (Home internet connection!) I can use DynDNS or any one of the similar services, but for this I either have to use their subdomain or pay to use my own, which I'd like to avoid.


Edit: Another thought- What would be the implications (Security &/ or otherwise) of using a Perl script to determine whether the IP is local & then serve a page as appropriate?

Cheers

-Leezer-