port forwarding with binding to specific IP on remote host




Hi all,

I want to establish an SSH tunnel. The remote host of
the SSH connection has two IP addresses that may be used
for outgoing connections. I want the ssh-tunnel to use
the non-default connection for the "forwarded" connection:

local host has IP 10.0.0.1

remote host has IPs 10.0.0.20 (eth0) and 10.0.0.21 (eth0:1).

I want to establish a tunnel from 10.0.0.1:1234 to
10.0.0.100:1234 using the remote host's IP 10.0.0.21.

When I use

ssh -L 1234:10.0.0.100:1234 root@xxxxxxxxx

the connection from my client host to the remote host
is established *to* IP 10.0.0.21 (of course), but the
host 10.0.0.100 sees IP 10.0.0.20 as source IP for my
connection. But I want it to see 10.0.0.21 as source IP.

Is it possible to solve this with pure ssh-magic, or
do I have to create iptables rules or special routing
table entries for this?

Thanks and best regards
-stefan-


--
--------------------------------------------------------------------
Dipl. Inf. (FH) Stefan Palme

email: kleiner@xxxxxxxxxxxxxxx
Key fingerprint = 1BA7 D217 36A1 534C A5AD F18A E2D1 488A E904 F9EC
--------------------------------------------------------------------

.



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