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  1. JDK
  2. JDK-8239355

(dc) Initial value of SO_SNDBUF should allow sending large datagrams (macOS)

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    • b15

    Backports

      Description

        The default value of net.inet.udp.maxdgram on macOS is 9216 which limits the size of the datagram that can be sent by applications that don't set the SO_SNDBUF option. Legacy DatagramSocket sets the value to 65507 at creation time. Sending large datagrams will clearly require fragmentation so it's not optimal but there may be applications that depend on it (the patch to set the socket option to 65507 seems to come from the original Apple port).

        The attached patch updates DatagramChannel so that the SO_SNDBUF is set to a minimum value of 65527 for IPv6 sockets and 65507 for IPv4 sockets.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8259850 (dc) Initial value of SO_SNDBUF should allow sending large datagrams (macOS)

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8230211 Prepare DatagramSocket for alternative DatagramSocketImpl

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8242885 PlainDatagramSocketImpl doesn’t allow for the sending of IPv6 datagrams on macOS with sizes between 65508-65527 bytes

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8243488 Add tests for set/get SendBufferSize and getReceiveBufferSize in DatagramSocket

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

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                pconcannon Patrick Concannon (Inactive)
                alanb Alan Bateman
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                  Updated:
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