Exchange migration

Tips for Migrating from Exchange to Google Apps Gmail

Submitted by Kurt Rademaekers on Mon, 08/30/2010 - 4:49pm

I recently had the opportunity to migrate a client company's email system from Microsoft Exchange to Gmail within their new Google Apps account.
The company users love the Gmail email environment, and the company loves the cost savings gained by migrating from Exchange/Outlook to Gmail.

The biggest—but not only—challenges for this particular migration included overcoming connectivity issues with the Exchange installation.

Summary of key findings and recommendations:

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Running scp through ssh tunnel

Run scp to machine R, which is only accessible through gateway machine G.

Step 1: Establish SSH tunnel. Pick a temporary port between 1024 and 32768 (1234 in this example). Port 22 will be used by scp.

$ ssh -L 1234:<address of R known to G>:22 <user at G>@<address of G>
# Adding "cat -" will keep it running while above will get you connected to G
$ ssh -L 1234:<address of R known to G>:22 <user at G>@<address of G> cat -

Either way you run it, open another terminal for next step.

Step 2: Run scp against port 1234 pretending 127.0.0.1 (localhost) is the remote machine R, and the command will be sent to R.

$ scp -P 1234 <user at R>@127.0.0.1:/path/to/file file-name-to-be-copied

References:
http://whoochee.blogspot.com/2012/07/scp-via-ssh-tunnel.html
http://www.rzg.mpg.de/networkservices/ssh-tunnelling-port-forwarding

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