Here's an example of a little larger scope. A->B->C is very easy:
A -> B -> C -> D -> E
| ^
\-------------------/
A> ssh -l UserOnB -L 6400:C:22 B # Create Tunnel from A->C though B on 6400
A> ssh -l UserOnC -p 6400 -L 6500:D:22 A # Create Tunnel from A -> D on 6500
A> ssh -l UserOnD -p 6500 -L 6600:E:22 A # Create Tunnel from A -> E on 6600
A> ssh -l UserOnE -p 6600 A # Puts me on E
To just tunnel from A->C through B use the first command. Then:
A> rsync -e ssh --port=6400 -whateveroptions /sourcefile userone@localhost
will connect you to C from A. Remember UserOnB will have to have UserOnA's
public key and the same goes for UserOnC for UserOnB's key.
Hope this helps!
---
Matthew R. Demicco
Taos Unix SysAdmin
> Heya,
>
> Our network is set up as follows:
>
> A -> B -> C
>
> I have a need to keep filesystems on A and C in sync. There's
> a firewall
> between A and B, and another one between B and C. There is no
> SOCKS and
> all connections must be initiated in the direction of the
> arrows shown, in
> keeping with corporate security policies.
>
> I can probably get my firewall admins to open up port 22 for
> ssh, after a
> lot of wrangling, and most likely, no other ports. How do I
> recursively tunnel from A to B and then B to C for rsync?
> Using B as an
> intermediate storage area is not an option.
>
> In other words, I'd like to rsync over two consecutive ssh
> tunnels (X11
> forwarding works without any problems over 2 tunnels). How can I
> accomplish this? Thanks!
>
> - Mandar
>
