Max UDP packet size + Java: weirdness

Nerius Landys nlandys at
Tue Feb 9 20:59:38 UTC 2010

> You've encountered:
> % sysctl net.inet.udp.maxdgram
> net.inet.udp.maxdgram: 9216
> However, increasing it will guarantee that you will exceed even normal jumbo frame size and thus depend upon IP fragmentation / reassembly for the traffic.  I don't consider that to be a good idea, but it might be OK for local traffic....

Wow thanks.  So it normally fits in 1 IP packet?  (What about the MTU
being like 1500 or something?)  What's wrong with fragmentation?  Any
links to explain this?  This isn't local traffic by the way, I will be
sending stuff between a data center in San Diego and a data center in

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