TFTP Server and a Linksys Router

[Joe Mama]

(Now its my turn)

Does anyone know how (or if its possible) To have my OUTSIDE IP address showing up in a TFTP suite (run from my machine)? I have several ports forwarded and I even set up DMZ on the machine in question. But it continues to only show my internal IP address. I know on TFTP suite it (usually) will give you the option of which IP address to use upon initial setup, but on every uninstall/reinstall it defaults to my internal addy. (And I know with a hub/switch it will see your outside address and give you the option of which one to use.
Thanks
-Me

[SledDog]

It may not be possible if you have a single static or dynamically assigned outside IP address without exposing yourself. If you have multiple outside static IPs (I have 5 associated with my DSL circuit) then your router would need the ability to "map" one of those additional static IPs directly through to a machine on the internal subnet. That machine must then use a statically defined IP (non-DHCP), although it can reside within the current subnet range.

Most router/hub-switch combos allow you to define the starting IP address to use with DHCP. On mine, I defined 192.168.254.10 as the first DCHP starting address. By "reserving" those first 10 addresses, I can then statically define 192.168.254.0 through 192.168.254.9 on any machine and yet still participate as a device within that subnet.

In the case of what you want, you would have to configure your router to map an additional outside IP through to the 10-dot subnet. Say you have 5 IPs, 12.24.36.48 thru 12.24.36.52 and your router is currently using .48 for primary traffic. You would then need to configure your router to map say, 12.24.36.50 directly to the internal static IP of 192.168.254.5 as an example.

Keep in mind that while directly mapped, that machine is also directly exposed on that 12.24.36.50 address and could be scanned or attacked unless you're running a software firewall like Tiny or ZoneAlarm.

Don't know if that helps. If nothing else and seeing you use a Linksys device, check this link and see if you can draw any similarities...

http://www.newircusers.com/router.html

[precisionmods]

On the router/hub combo home devices, you have to map ports to a static internal non-routeable class c address. Then you connect to your primary routeable address and it will proxy over the connecton for you. Don't forget on FTP to map port 20 and 21 as it uses 20 to pass the user/password.

Because of your IP address, the software will only show your 192.168.x.x address since that's the address on the NIC.

Make any sense?

[Joe Mama]

Originally posted by precisionmods


Because of your IP address, the software will only show your 192.168.x.x address since that's the address on the NIC.

Make any sense?

I pretty much gathered that because my NIC card in the machine is hard set to a 192.xxx addx. Im figuring the only way to pull this off is to haev a block of IP addies (or at least more than 1) My ISP assigned IP (is well assigned) to the router itself, therefore making it not quite possible to share it with another piece of hardware. Damn it all... Im gonna figure out a way around this But I do appreciate your help you two!
-Me

[precisionmods]

Originally posted by Joe Mama
I pretty much gathered that because my NIC card in the machine is hard set to a 192.xxx addx. Im figuring the only way to pull this off is to haev a block of IP addies (or at least more than 1) My ISP assigned IP (is well assigned) to the router itself, therefore making it not quite possible to share it with another piece of hardware. Damn it all... Im gonna figure out a way around this But I do appreciate your help you two!
-Me

You can have your TFTP machine on both networks, you just need 2 NICs. One for your ISP as they dole out another address to you and one on your internal lan. However, this presents a gaping hole, but that can be plugged up with a software firewall.