1500 does not work: Thoughts on increasing MTUs on the internet
Petri Helenius
pete at he.iki.fi
Sun Apr 15 15:48:47 UTC 2007
Marshall Eubanks wrote:
>
> Dear Pete;
>
> The streaming servers that I have dealt with (such as Darwin Streaming
> Server) do the fragmentation at the application layer. They thus send
> out lots of packets at or near (in this case) 1450 bytes, but they are
> not UDP fragments.
> That's the whole point - many networks will not deliver fragments at
> all, much less the increased risk of loss when they do. (I use Cox
> Cable at home, and this network apparently does not forward fragments
> and also has an apparent MTU of 1480 bytes.)
>
> Just looked at a YouTube dump, btw, and almost all of the packets are
> 1448 bytes.
I'm referring to Windows Media and Real. They are the worst offenders,
though not too many use them without HTTP.
Pete
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