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https://issues.jboss.org/browse/JGRP-1880?page=com.atlassian.jira.plugin....
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Bela Ban commented on JGRP-1880:
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I picked the reflection based solution. This should work at least on Oracle's JDK and
OpenJDK. In 4.0, we'll switch to {{DatagramChannel}} anyway and then, this code can be
removed.
Backported to 3.5.1.
UDP.ip_ttl is ignored and is always 1
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Key: JGRP-1880
URL:
https://issues.jboss.org/browse/JGRP-1880
Project: JGroups
Issue Type: Bug
Reporter: Bela Ban
Assignee: Bela Ban
Fix For: 3.5.1, 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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