ssh-port-forwarding-ref

Quick reference of ssh port forward commands -- because I can never seem to remember...

Network diagram:

  near-host   <--->   this-box   <--->   remote-box   <--->   far-host
  (4.3.2.1)           (1.2.3.4)          (5.6.7.9)            (9.8.7.6)

Make service running at remote-box:3000 available at this-box:3001

# All equivelent:
ssh -L 1.2.3.4:3001:5.6.7.9:3000 user@remote-box -N
ssh -L this-box:3001:remote-box:3000 user@remote-box -N

Make service running at far-host:80 available at this-box:5000

ssh -L this-box:5000:far-host:80 user@remote-box -N

Make service running at near-host:443 available at remote-box:4000

ssh -R remote-box:4000:near-host:443 user@remote-box -N

Ports within the same host:

Make service running at this-box:3000 available at this-box:3005

# All equivelent:
ssh -L this-box:3005:this-box:3000 user@this-box -N
ssh -L 1.2.3.4:3005:1.2.3.4:3000 user@localhost -N

Make service running at remote-box:5000 available at remote-box:5010

# All equivelent:
ssh -R remote-box:5010:remote-box:5000 user@remote-box -N
ssh -R 5.6.7.9:5010:5.6.7.9:5000 [email protected] -N

Multiple ports and wildcard address

Make both ports 443 & 902 on far-host available on all IPs on this-box:

ssh \
 -L *:443:far-host:443 \
 -L *:902:far-host:902 \
user@remote-box -N

Make port 22 on this-box available at port 8022 on remote-box:

ssh -R *:8022:*:22 user@remote-box -N