Routing additional ISDN connection to LAN

Hi everybody,

I've got a Linux server that's already a gateway between an internet
connection (eth0) and a LAN (eth1) 192.168.1.x. This server has an ISDN
adapter, too, which I use for connecting to a remote computer for
administration via ippp0 that has the IP 192.168.2.60.

I already added a /sbin/route command to the script ip-ip.local that
is:
/sbin/route add -host 192.168.2.60 dev ippp0

What I can do is connecting to this computer from my Linux server.

What I'd like to do is connecting to this computer from my other
computers in eth1 (192.168.1.x).
But I just can't manage it. Has anybody got an idea?

Best regards,
Johann