The situation is as follows: assume that I have a computer A and computer B. I am able to ssh to both computers when by setting Port Trigger and Single Port Forwarding on my router. However, I am not able ssh to computer A from computer B without explicitly setting the Port Forwarding.
Both computers are Linux (Ubuntu 3.13, Kali 3.14), AirLive router.
Is this computer or router problem/misconfiguration? What should be set/configured to solve this?