Hi 

We have network consisting of three systems.

A - source 
B - acting as router
C - destination

Between A-B we have UDP running over ethernet. Between B-C we need PPP over serail port.

Once ppp server and client are estbalished between B and C the IP address of C will be sent to A. which means all three 
systems have defined IP, B will have 2 one on ehternet port and another for Serail port.

Now task is 

1. when A trasmit packet with destiantion IP address of C, B should capture that and channel it through Serail port over
 PPP protocol - for this we are planning to edit routing table of A so that for packets destianted toward C, B will act 
as router. i.e from A the next hop for packets realted to C will be B - let me your comments

2. C is a third party system we dont have any control on it expect assignning IP, Initially we thought we will use 
socket progamming to tranmsit and receive paskets between B and C, but we dont have any data of port number of C. 

please let me know is there any way where i can capture raw packets destainted to an IP irrespective of port number. 
simialrly how to send a packets to an Ip with out using scoket program and Port number.


thanks
Ravi