SSH reverse tunneling: getting a static IP from a cloud

SSH reverse tunneling is a method of forwarding any type of traffic from a remove machine to your local laptop - so you can have, for example, AWS free tier with static ipv4/ipv6 - and calls to that IP will be forwarded to your laptop (and answers from your laptop back to the client). It can be useful if you want to share something directly from your laptop but you are behind NAT (most ISP have this - because of IPv4 address exhaustion) and without static IP at your home. Another direction - tunneling from your local laptop to remove machine is called SSH tunneling.

Server (remote with static IP)

FILE /etc/ssh/sshd_configMake sure to have GatewayPorts yes

Port 22
UsePAM yes
PrintMotd no
AcceptEnv LANG LC_*
AllowTcpForwarding yes
AllowAgentForwarding no
AllowStreamLocalForwarding yes
PermitTunnel yes
GatewayPorts yes

Client (your laptop)

How to connect without a config file:

user $ssh -i key.pem -R <port-incomming>:localhost:<port-local> algo@xx.xx.xx.xx -p <for-for-connecting>

It can be simplier with config file that is supplied by -F

FILE ssh_config_reverse_tunnelPort 63368 of remote incoming will be forwarded to your local port 8000

Host xx.xx.xx.xx
  User user
  Port 22
  IdentitiesOnly yes
  IdentityFile /path/to/key.pem
  KeepAlive yes
  ServerAliveInterval 30
  RemoteForward 63368 localhost:8000

And now you command is shorter:

user $ssh -F ssh_config_reverse_tunnel xx.xx.xx.xx

It works even if you connected to the same machine by VPN.

See also

SSH tunneling

https://serveo.net: SSH reverse tunneling as-a-service

man