1. When to use it
Very useful for debugging, temporary maintenance, and access to internal panels without changing the server firewall.
ssh -L | ssh -R | ssh -D | tunnel | forwarding
2. Base setup
ssh -L 8080:127.0.0.1:80 user@remote
ssh -R 2222:127.0.0.1:22 user@remote
ssh -D 1080 user@remoteAdjust host names, IPs, interfaces, paths, and versions to the real system before making the change persistent.
3. Quick verification
ss -lnt | grep -E '8080|1080|2222'
curl -I http://127.0.0.1:8080
pgrep -laf 'ssh -'Confirm that the output matches the expected state before considering the intervention complete.
4. Operational notes
Remote forwarding may require specific sshd_config options: verify them before blaming the client.
Quick checklist
[ ] Steps completed\n[ ] Config updated\n[ ] Tests executed\n[ ] Rollback ready\n[ ] Logs checked