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    SubjectUDP bugs
      Hi, all. I've been sending UDP packets around, and have come across
    some limitations in the maximum packet size. I use the write(2) call
    on a connected UDP socket. Below are shown the maximum packet sizes
    for different combinations of sender and receiver OS:

    Linux 2.0.36 -> Solaris 2.5.1 65507

    Linux 2.1.126 -> Linux 2.1.126 65476
    Linux 2.1.126 -> Solaris 2.5.1 65507

    Linux 2.1.131 -> Linux 2.1.131 65476
    Linux 2.1.131 -> Solaris 2.5.1 65507

    Solaris 2.5.1 -> Linux 2.0.36 51792
    Solaris 2.5.1 -> Linux 2.1.126 65476
    Solaris 2.5.1 -> Linux 2.1.131 65476

    Solaris 2.5.1 -> Solaris 2.5.1 65535 (what you expect)

    From this it appears Linux 2.1.x has an output limit of 65507 bytes
    and an input limit of 65476 bytes. Further, Linux 2.0.36 has an output
    limit of 65507 bytes (same as 2.1.x) and an input limit of 51792
    bytes.

    Packets which exceed the maximum size go to the big bit bucket in the
    sky. RIP. This is a problem for programmes which "know" that they can
    send 65535 byte packets over UDP.

    Regards,

    Richard....

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