How determine which netw. Interface is used with java

Question

I want to know if it's possible to determine which network interface is used by a java code.

For example I could use an inputstream with an URL object to download the source code. But I want the traffic to go through the interface wlan0 for example and not eth0. Is it possible to check which interface is currently used for the java network process?

Answer 1

To check with interface was used you can take a tcpdump of all the network traffic in and out of the machine and use a tool like wireshark to view it. A simpler approach is to look at the number of Tx and Rx packets in ifconfig -a to see which interface was used.