[jboss-jira] [JBoss JIRA] (JGRP-1880) UDP.ip_ttl is ignored and is always 1

[Bela Ban (JIRA)]

Bela Ban created JGRP-1880:
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             Summary: UDP.ip_ttl is ignored and is always 1
                 Key: JGRP-1880
                 URL: https://issues.jboss.org/browse/JGRP-1880
             Project: JGroups
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.6


Since we switched from using a {{MulticastSocket}} for sending of multicast packets to a {{DatagramSocket}}, the time-to-live (TTL) of a packet is always {{1}}. The reason is that method {{setTimeToLive()}} only exists in {{MulticastSocket}}, but not in {{DatagramSocket}}.
We cannot revert the code and use a {{MulticastSocket}} to send multicasts, as this won't reveal the real IP address of the sender, but only the multicast address, and the real address is needed to drop packets at the _transport level_.
Investigate whether we could use reflection to get the {{DatagramSocketImpl}} and call {{setTimeToLive()}}.



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