[NTLUG:Discuss] Accessing a machine behind a router.

[Mike LaPlante]

Steve Baker wrote:
> Hi!
>
>   I've always had a fixed IP address for my home machine in the past - 
> and I always had a Linux box with two ethernet adapters as my 
> firewall.   So if I needed something off my home PC when I was at work, 
> I could (for example) ssh into the firewall box - then from there ssh 
> into my internal network to get files and such.
>
>   Now (as a temporary situation), I have a different setup where there 
> is a LinkSys router getting it's address from my ISP via DHCP - and my 
> PC hooked up to that - via DHCP (with the address allocated by the router).
>
>   Let's suppose I know the currently assigned DHCP addresses of both the 
> router and the PC - how the heck can I reach the PC from the outside 
> world?   It's address is something like 192.168.1.2 and the router has 
> some other address 66.xxx.xxx.xxx assigned to it by the ISP.   From the 
> other side of the Internet, I can't "ssh steve at 192.168.1.2" - and 
> (presumably) I can't ssh into the router and then get to my machine.  Is 
> there some way to tell things like ssh, scp, and maybe occasionally NFS 
> or my browser to go FIRST to 66.xxx.xxx.xxx and THEN to route to 
> "steve at 192.168.1.2" ?
>
>   Let's not consider HOW I know those two addresses - and let's not be 
> concerned with security issues for the moment - I just can't get my head 
> around how to route SSH-type commands through the router and onto the 
> internal network.
>
> Thanks!
>
>
>   
On the "Applications and Gaming" tab of your Linksys you can setup port 
fowarding for port 22. Point all outside port 22 traffic to 192.168.1.2 
on the internal network. That would be the simplest solution.

Without getting into ssh tunnels and such. Which would need to be 
initiated from the internal network before remote access could be obtained.

Mike