>In the firewall configuration I found a setting which rejects all incoming connections from out side on modem0.
>I use a dialup connection to connect to internet. Every time I dial in a dynamic IP is assigned.
>I want to telnet from remote PC to my linux.
>How do I get the server IP address and will the firewall allow the connection.
>
>Rajesh

You've got me... ??? If the IP is assigned dynamically everytime you dial in then I'd su to root and run
netstat -rn
to see what the IP address is.
or netstat without any arguments to see every port on your box.
JLK