Q: ifconfig alias vs. ssh tunnel doesn't work.

From: Rob (stopspam_at_users.sourceforge.net)
Date: 05/19/04

  • Next message: Rob: "Re: Q: ifconfig alias vs. ssh tunnel doesn't work." 
    Date: Wed, 19 May 2004 11:41:39 +0900
To: freebsd-questions@freebsd.org

    Hi,

    I use an ssh-tunnel from a PC on a local network behind a gateway to
    another PC on the internet. Say the PC behind the gateway is LOCAL
    and the other internet PC is REMOTE.

    On LOCAL I do as a regular user:

       $ ssh -2 -N -f -R 2201:127.0.0.1:22 REMOTE

    Then on REMOTE I can then do:

       $ ssh -p 2201 127.0.0.1

    All this works fine for login from REMOTE to LOCAL, bypassing the gateway.

    ------------------------------

    I then want the following to work.

    On REMOTE I do, as root:
        # ifconfig lo0 alias 127.0.0.2
        # ifconfig lo0
        lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
             inet6 ::1 prefixlen 128
             inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
             inet 127.0.0.1 netmask 0xff000000
             inet 127.0.0.2 netmask 0xff000000

    To double check, I verified that I can login to myself on REMOTE:
        $ ssh REMOTE

    On REMOTE I then want to login to LOCAL, as regular user:
        $ ssh -p 2201 127.0.0.2
        ssh: connect to host 127.0.0.2 port 2201: Connection refused

    Can somebody explain to me why the ssh-tunnel does not work this way?

    Thanks,
    Rob.

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  • Next message: Rob: "Re: Q: ifconfig alias vs. ssh tunnel doesn't work."

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