Subject: Re: NFS problem.
To: Steven M. Bellovin <>
From: Johnny Billquist <>
List: current-users
Date: 12/10/2005 18:44:29
Steven M. Bellovin wrote:
> In message <dne4vq$qbc$>, Michael van Elst writes:
>> (Matthias Scheler) writes:
>>>Yes, but it hasn't changed and never will. Large UDP packets are sent
>>>as IP fragments. If you lose one of the IP fragments the whole UDP
>>>packet is lost because there is no selective retransmit. When a machine
>>>e.g. loses 5% of incoming packets at least one of the IP fragments
>>>of a 32KB UDP packet will always get lost. Retries will not help because
>>>another single lost packet will prevent the reception of the UDP packet.
>>On the other hand, TCP isn't exactly fast with 5% packet loss either.
> Right, but TCP adapts its sending rate to the level that avoids packet 
> loss.

Exactly how does it do that in this instance?
We're talking about the fact that if we send back to back packet on the 
net, we have a limit of (in this case I believe) 2 packets. All other 
situations will work fine.


Johnny Billquist                  || "I'm on a bus
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