[181600] 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 (Bob Evans)
Mon Jun 29 10:24:34 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <15453.1435509262@turing-police.cc.vt.edu>
Date: Mon, 29 Jun 2015 07:22:16 -0700
From: "Bob Evans" <bob@FiberInternetCenter.com>
To: Valdis.Kletnieks@vt.edu
Reply-To: bob@FiberInternetCenter.com
Cc: manning <bmanning@karoshi.com>, nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
It is true - you I have had to throttle back for years for optimum
transport on many carriers. In fact, if you have an ATT transit in your
mix of BGP you wont get a ping response at 1500 MTU from that ATT router.
On Sun, 28 Jun 2015 08:02:52 -0700, Owen DeLong said:
>>
>> > On Jun 27, 2015, at 11:48 , manning <bmanning@karoshi.com> wrote:
>> >
>> > Quite a few folks actually. (the 802.5 & 802.4 specs)….
>> > 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?
>>
>> Many networks have… It’s called “Jumbo Frames”
>
> Unfortunately, enough people do things to break PMTU Discovery that it's
> not
> usually feasible to send jumbograms outside your directly controlled
> networks.
> So you may actually have jumbogram support all the way one end to the
> other,
> but you can't rely on it and have to throttle back to 1500 (or even
> smaller)
> in self-defense....
>
