North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: Thoughts on increasing MTUs on the internet
> 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
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