[Moved to !iiiiiiitttttttttttt@programming.dev, check pinned post.] iiiiiiitttttttttttt.

I'll save noobies some time.

for (( i=1; i<65536; i++ ));do  
  for (( j=1; j<256; i++ ));do  
    ssh -L $j$i:127.0.0.1:$i -N 192.168.1.$j &  
  done  
done  

What could go wrong?

Okay clearly this won't work because there aren't enough local ports to match to 16 bits of ports on potentially 255 machines, but with some slight modification I could add in a test to only increment the local port if the forward is successful and thereby create the dumbest-ass port forwarding script ever.