That means the largest UDP packet you can have is 65507 bytes long.
On Sun, Dec 13, 1998 at 01:50:25PM +1100, Richard Gooch wrote:
> 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.
Looks like Linux gets the transmit size right, and the receive size
wrong.
> 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.
65535? Do you mean including the UDP and IP header, or 65535 bytes of
application data.
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