Changes between Version 36 and Version 37 of HowTo/LoginToNodes

Timestamp:

08/17/12 00:42:14 (12 years ago)

Author:

nriga@bbn.com

Comment:

--

HowTo/LoginToNodes

@@ -182 +182 @@
 user@<pub_host>$> ssh <username>@<priva_host>
 }}}
-    2. If the above option does not work then you can try using [https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding ssh port forwarding] to get to your host. The main idea is that you will forward a local port on the client to go through the connection to <pub_host> and from there to ssh to <priv_host>. If you want to do this in command line then :
-{{{
-
-}}}
-    }}}
+    2. If the above option does not work then you can try using [https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding ssh port forwarding] to get to your host. The main idea is that you will forward a local port on the client to go through the connection to <pub_host> and from there to ssh to <priv_host>. If you want to do this in command line then first login to the public host:
+ {{{
+ssh -L <local port>:<priv_host>:22 <username>@<pub_host> 
+}}}
+ 
+   Then on a different terminal, try logging to the private host through the local port :
+ {{{
+ssh -i <private key> <username>@localhost -p <local port>
+}}}
+
+   You can also modify the ssh configuration file to that effect. This way it is easier to port-forward multiple firewalled hosts by adding the following lines in the file :
+ {{{
+Host <pub_host_alias>
+  Hostname <pub_host>
+  LocalForward <local port1> <priv_host_1>:22
+  LocalForward <local port2> <priv_host_2>:22
+  user <username>
+
+Host <priv_host_alias_1>
+  Hostname localhost
+  port <local port1>
+  user <username>
+
+Host <priv_host_alias_2>
+  Hostname localhost
+  port <local port2>
+  user <username>
+}}} 
+   Then on one terminal do :
+ {{{
+ssh <pub_host_alias>
+}}}
+
+   And on another terminal:
+ {{{
+ssh <priv_host_alias_1>
+}}}