Re: Another proposal to think about
William Westfield <BILLW@MATHOM.CISCO.COM> Fri, 01 December 1989 13:54 UTC
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Date: Fri, 01 Dec 1989 05:54:06 -0000
From: William Westfield <BILLW@MATHOM.CISCO.COM>
Subject: Re: Another proposal to think about
To: mogul
Cc: mtudwg
In-Reply-To: <8911291833.AA00675@acetes.pa.dec.com>
Message-Id: <12546625828.8.BILLW@MATHOM.CISCO.COM>
NFS (+ Sun RPC) provide a textbook example of both the possibility of doing this right, and the dangers of doing this wrong. Sun RPC loves to send 8kb UDP packets over an Ethernet (with a 1.5kb MTU). This is often a disaster when a gateway (or slow receiver interface) is involved. This common example raises some interesting questions. A SUN knows very well that the MTU is at most 1500 bytes, and then decides to use 8k packets anyway. Since using a smaller packet size allows "slow hosts and routers" to work better, it is fairly clear that it is slower this way (unless it doesn't work at all with big packets). Is fragmentation that occurs at the originating host that much less "harmfull" than fragmentation that occurs at routers? (I think perhaps so.) Why doesn't sun use 8k tcp packets too, anyway? BillW -------
- Re: SMB's proposal: using an IP option for "Repor… Steve Deering
- Re: SMB's proposal: using an IP option for "Repor… Philippe Prindeville
- Re: SMB's proposal: using an IP option for "Repor… Jeffrey Mogul
- Re: Another proposal to think about Jeffrey Mogul
- Re: SMB's proposal: using an IP option for "Repor… Jeffrey Mogul
- Re: Another proposal to think about William Westfield
- Re: SMB's proposal: using an IP option for "Repor… Philippe Prindeville
- Re: yet another MTU discovery scheme Jeffrey Mogul
- Re: Minutes of MTU Discovery Working Group Meetin… Jeffrey Mogul
- Re: routing protocols will provide path-MTU Jeffrey Mogul
- Re: number of octets returned in ICMP error messa… Jeffrey Mogul