RFR: 8284890: Support for Do not fragment IP socket options

[Michael McMahon]

On Fri, 15 Apr 2022 09:19:48 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Hi,
>> 
>> Could I get the following PR review please? It adds a new JDK specific extended socket option
>> called IP_DONTFRAGMENT, which disables IP packet fragmentation in both IPv4 and IPv6
>> UDP sockets (NIO DatagramChannels). For IPv4 in particular, it sets the DF (Dont Fragment) bit
>> in the IP header. There is no equivalent in the IPv6 packet header as fragmentation is implemented
>> exclusively by the sending and receiving nodes.
>> 
>> Thanks,
>> Michael
>
> test/jdk/jdk/net/ExtendedSocketOption/DontFragmentTest.java line 40:
> 
>> 38: 
>> 39: public class DontFragmentTest {
>> 40: 
> 
> Should we have a similar test for DatagramSocket / MulticastSocket / DatagramChannel.socket() ?

Good idea

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PR: https://git.openjdk.java.net/jdk/pull/8245