Thanks for the response.
But I must be an idiot, I still can't get this.
Where do I do this?
external IP [or hostanme] port 22 to machine 1 - internal IP port 22
external IP [or hostname] port 23 to machine 2 - internal IP port 22
I tried forwarding ports on my router in all different configurations. Ive seen some ssh commands such as
ssh -L 9999:mailserver:110 shellserver
but again I'm lost as to put what where. Any other advice?