> Hi folks!
>
> Does anyone really know how can I make a computer running IB "see"
> another one (running IB, too) over the Internet (in order each of
> them can access and alter data on each other's database)? Some useful
> info:
>
> - I've already opened port 3050 (for TCP & UDP) on both machines, but
> it didn't work.
>
> - The type of connection is broadband ADSL (PPPoE).
>
> - Both machines connect to the Internet through a router (SpeedStream
> 5200).
>
> - The router's built-in firewall is ON (but even when it is OFF the
> connection between the computers doesn't succeed)
>
> - NAPT is enabled (if I disable it, computers can't access the
> Internet).
>
> - When NAPT is ON, both computer's routers don't answer to the PING
> command sent to their IP addresses.
>
> - When NAPT is OFF, both computers answer to the PING command and can
> be accessed by Telnet.
>
> - The FIXED IP of both computers is 192.168.254.1 (netmask
> 255.255.255.0). There's no IP conflict, since they are on different
> networks and under NAPT.
>
> - The IP of both routers is 192.168.254.254 (netmask 255.255.255.0).
>

The 192.168 subnet IP range is not broadcast over the network (routers will
drop them before broadcast). Nor is the 10. subnet. Unless you have a VPN
established then these machines will never see each other.
Do a google on 192.168 and you will see this
Alan