Define the remaining TTL multicast packet in Java

Question

If I have a Java program that listens for multicast data, how can I find out what the remaining TTL of the incoming datagram is?

I know how to set TTL on the sending multicast socket, but I want to know the remaining TTL of the incoming packet.

Answer 1

If you get UDP datagrams with a raw socket, you can check for TTL (or anything else in the IP or UDP headers). However, there are many errors:

• Raw Sockets Java ( : http://www.savarese.org/software/rocksaw/index.html).
• root
• UDP, ... , , TTL ( jambjo).

Answer 2

? UDP IP-, TTL, -. (split ) Java IP.

Answer 3

( , ), Java API .

TTL - 9- IPv4. , 9- DatagramPacket ? TTL? , IP DatagramPacket, IPv4?