Accessing My Subnet With SSH

[PairOfBlanks2]

Hi all,

I have two GNU/Linux computers on my LAN. I want outsiders to be able to SSH into the one of their choice. Needless to say, outsiders have no way to reconfigure my router's port forwarding options. Outsiders are also using GNU/Linux.

[Irithori]

Then either
a) you configure two portforwardings for them.
Pick two random ports on your router, open the fw for these, and portworward to the correct machines in your LAN
b) install and configure a VPN server on your router. Give the outsiders access to it.
This is probably the better choice, but depends on the security of the LAN (maybe even consider a separate LAN for the "outsiders")

[PairOfBlanks2]

Then either
a) you configure two portforwardings for them.
Pick two random ports on your router, open the fw for these, and portworward to the correct machines in your LAN
b) install and configure a VPN server on your router. Give the outsiders access to it.
This is probably the better choice, but depends on the security of the LAN (maybe even consider a separate LAN for the "outsiders")

My specific case works better with option "A". Many Thanks.
Attn Googlers: Making this work requires extra options with SSH. See "man ssh" for instructions.