nanog mailing list archives
RE: Thoughts on increasing MTUs on the internet
From: <michael.dillon () bt com>
Date: Fri, 13 Apr 2007 10:03:53 +0100
No, I doubt it will change. The CRC algorithm used in Ethernet is already strained by the 1500-byte-plus payload size. 802.3 won't extend to any larger size without running a significant risk of the CRC algorithm failing.
I believe this has already been debunked.
From a practical side, the cost of developing, qualifying, and selling new chipsets to handle jumbo packets would jack up the cost of inside equipment. What is the payback? How much money do you save going to jumbo packets?
I believe that the change is intended to apply to routers and the ethernet switches that interconnect them in PoPs and NAPs and exchange points. Therefore the cost of a small chipset modification is likely to be negligible in the grand scheme of things. As for numbers, it is not dollar figures that I want to see. I would like the people who have jumbo packets inside their end-user networks to run some MTU discovery and publish a full MTU matrix on all paths on the Internet. That way we can all see where there is end-to-end support for large MTUs and people who want to make buying decisions on this basis will have something other than vendor assurances to show that a network supports jumbograms. --Michael Dillon
Current thread:
- Re: Thoughts on increasing MTUs on the internet, (continued)
- Re: Thoughts on increasing MTUs on the internet Stephen Satchell (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Saku Ytti (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Valdis . Kletnieks (Apr 13)
- RE: Thoughts on increasing MTUs on the internet Leigh Porter (Apr 13)
- RE: Thoughts on increasing MTUs on the internet Mikael Abrahamsson (Apr 13)
- Re: Thoughts on increasing MTUs on the internet Stephen Sprunk (Apr 13)
- RE: Thoughts on increasing MTUs on the internet Lasher, Donn (Apr 13)
- Re: Thoughts on increasing MTUs on the internet Stephen Sprunk (Apr 13)
- Re: Thoughts on increasing MTUs on the internet Stephen Satchell (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Steve Meuse (Apr 13)
- Re: Thoughts on increasing MTUs on the internet Adrian Chadd (Apr 13)
- RE: Thoughts on increasing MTUs on the internet michael.dillon (Apr 13)
- Re: Thoughts on increasing MTUs on the internet Stephen Wilcox (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Joe Loiacono (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Mikael Abrahamsson (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Joe Loiacono (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Mikael Abrahamsson (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Joe Loiacono (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Daniel Senie (Apr 12)
- Re: Thoughts on increasing MTUs on the internet David W. Hankins (Apr 12)