ssh remote forwarding auto reconnect / ssh remote tunneling auto reconnect

ssh remote forwarding auto reconnect

Hardware Box 

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serverA  : with public ip

serverB  : inner firewall

prepare : ssh, autossh(ServerB)

1. ServerB

#cd ~

 go home directory

#ssh-keygen -t rsa  

 no passphrase (not that secure, but easy to setup)

 you should now have the key pair in the .ssh directory (id_rsa & id_rsa.pub)

#cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_key_serverB

 make a copy of your public key with the name 'authorized_key'

#scp ~/.ssh/authorized_key_serverB <remote user>@<ServerA's ipaddress>:'/<user's home dir>/.ssh/'

 copy authorized_key to ServerA

2. ServerA

#cat ~/.ssh/authorized_key_serverB >> ~/.ssh/authorized_keys

3. ServerB

#autossh -i ~/.ssh/id_rsa -L 1234:localhost:6667 <remote user>@<ServerA's ipaddress>

<< ssh forwarding

#autossh -i ~/.ssh/id_rsa -R 8080:localhost:80 <remote user>@<ServerA's ipaddress>

<< ssh remote tunneling 

#autossh -f -N -i ~/.ssh/id_rsa -R 9050:localhost:80 -R 9001:localhost:9001 -R 9049:localhost:22 <remote user>@<ServerA's ipaddress>

<< reality sample. without shell 

reference : http://www.linuxquestions.org/linux/answers/Networking/Forward_ports_via_an_SSH_tunnel_with_auto_reconnect_using_key_pair_authentication