From: "Geo" 

"John Beckett"  wrote
in message news:428dc1a1.15973558{at}216.144.1.254...

> Suppose that all networks are Ethernet. My computer could send a single
> UDP message to your computer. Say the message is 4000 bytes. My IP layer
> will send three fragments (roughly 1500, 1500 and 1000 bytes). Each router
> simply receives and forwards each fragment, so the router needs a 1500
> byte buffer only. Your computer has to have a buffer of 4000 bytes if it
> wants to receive the whole message.

How does your computer know to use 1500? If the first router in this
network is a DSL router going over frame or atm where it's required to keep
the mtu below 1490, won't this put the load of fragmenting on the router
instead of the computer? Could that be the bottleneck causing the slowdown
in the example being discussed?

Geo.

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