Friends ,
plz help ...

I have configured RRDTool using the following websites :
http://martybugs.net/linux/rrdtool/
http://martybugs.net/linux/rrdtool/traffic.cgi

Here the main important thing is "rrd_traffic.pl" - a perl script file . Now i want to know about a matter .

suppose i have a linux server . And it has 3 Lan card (interface card ) and every lan card is connected with two or more network . Lan1 is connected directly with internet , Lan2 is connected with two network like 192.168.10.0/24 and 192.168.11.0/24 , Lan3 is connected another two network 192.168.20.0/24 & 192.168.21.0/24 .

Now i want to measure network traffic from 192.168.10.0 (Lan2) to 192.168.20.0/24 (Lan2) or 192.168.21.0/24 (lan2) to 192.168.11.0/24(Lan1) . Then is it possible to do this using the above "Perl Script" in RRDTool ?
If it is not then plz give me some suggestion how i can do this measurement from one network portion to another network portion ?

Thx..........