[181558] in North American Network Operators' Group
Re: How long will it take to completely get rid of IPv4 or will it
daemon@ATHENA.MIT.EDU (Stephen Satchell)
Sat Jun 27 19:00:45 2015
X-Original-To: nanog@nanog.org
Date: Sat, 27 Jun 2015 15:58:43 -0700
From: Stephen Satchell <list@satchell.net>
To: nanog@nanog.org
In-Reply-To: <A5E20F0B-AF27-4B28-84E8-CC719DA79F9E@karoshi.com>
Errors-To: nanog-bounces@nanog.org
On 06/27/2015 11:48 AM, manning wrote:
> This is kind of like asking when we will stop using ethernet framing
> (ethernet was designed for a 3Mbps transmission rate) yet we are
> deploying 100Gbps networks. Still stuck on that 1500byte limitation.
> When can we get rid of that?
Speed has nothing to do with frame size. The 1500 byte limitation is
more a function of the CRC algorithm. (Oh, the initial frame size was
selected for 3-mbit Ethernet so that collision mitigation was reasonable.)
Think about jumbo frames (9000 bytes) and their robust error detection.
Research is being done in even larger frames, because the rule is that
as your transmission rate increases, you should increase the frame size
and use a FRC algorithm that detects all one-bit errors and most two-bit
errors, at least.
