How can I determine the IP of my router/gateway in Java?

Question

How can I determine the IP of my router/gateway in Java? I can get my IP easily enough. I can get my internet IP using a service on a website. But how can I determine my gat

Answer 1

To overcome the issues mentioned with traceroute (ICMP-based, wide area hit) you could consider:

1. traceroute to your public IP (avoids wide-area hit, but still ICMP)
2. Use a non-ICMP utility like ifconfig/ipconfig (portability issues with this though).
3. What seems the best and most portable solution for now is to shell & parse netstat (see the code example here)