North American Network Operators Group
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Re: 1500 does not work: Thoughts on increasing MTUs on the internet
- From: Petri Helenius
- Date: Sun Apr 15 11:52:39 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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