On Fri, 9 Jan 2004, Scheldebouw wrote:
> It's a bit of a strange setup. The modem has an IP address (192.168.1.1) > for management but is placed in bridged mode. The GNATbox receives an IP > from the ISP via DHCP on the external interface. My internal subnet is > 192.168.240.0/24. > Now if I want to manage the modem I directly connect a laptop via 1:1 UTP > cable but I would like to telnet to in from a PC in the internal network. > If I need to renumber the internal subnet to 192.168.1.0/24 or give the > modem a different IP that would not be a problem .
Sounds like the solution for you is to add a NAT Alias to the External interface for the 192.168.1.0/24 subnet. Be sure to include the /24 netmask on the alias, since it's the first IP defined in that network.
If you have restrictive outbound filters, you'll also need to open up access to the host..but if you have basic allow-all outbound filters, you shouldn't have a problem.
After adding the alias, the gnatbox will know how to reach the 192.168.1.0/24 network and all hosts using the gnatbox as their gateway will be able to reach the host. Traffic to the DSL modem will be NATed to the alias, so if have access filters on the DSL modem you may need to adjust them accordingly. No other configuration should be needed on the DSL modem since it will see the traffic as on its local network.
Thanks for the suggestion. I tried that and it won't work. If I set the alias I can ping to 192.168.1.1 but not telnet, but at the same time I lose connection to the Internet!
I also tried setting a static route for 192.168.1.0/24 to the address of the external interface, that didn't help either.
Any other suggestions? Thanks!
-- Benno...
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