nanog mailing list archives
Re: RINA - scott whaps at the nanog hornets nest :-)
From: Jack Bates <jbates () brightok net>
Date: Mon, 08 Nov 2010 14:29:44 -0600
On 11/8/2010 12:36 PM, Mans Nilsson wrote:
I'd concur that links where routers exchange very large routing tables benefit from PMTUD (most) and larger MTU (to some degree), but I'd argue that most IXPen see few prefixes per peering, up to a few thousand max. The large tables run via PNI and paid transit, as well as iBGP. There, I've seen drastical improvements in convergence time once PMTUD was introduced and arcane MSS defaults dealt with. MTU mattered not much. Given this empirical data, clearly pointing to the fact that It Does Not Matter, I think we can stop this nonsense now.
His point wasn't to benefit the BGP routers at the IX, but to support those who need to transmit > 1500 size packets and have the ability to create them on the edge. In particular, the impact of running long distances (high latency) with higher packet drop probability. In such a scenario, it does matter.
Even if you don't see that many > 1500 byte packets, doesn't imply that it doesn't matter. I have v6 peerings and see very little traffic on them compared to v4. Should I then state that v6 doesn't matter? If people have an expectation of not making it through core networks at >1500, they won't bother trying to send >1500. If the IX doesn't support >1500, why would people connecting to the IX care if their backbones support >1500?
Jack
Current thread:
- Re: RINA - scott whaps at the nanog hornets nest :-), (continued)
- Re: RINA - scott whaps at the nanog hornets nest :-) Jeff Kell (Nov 07)
- RE: RINA - scott whaps at the nanog hornets nest :-) George Bonser (Nov 07)
- Re: RINA - scott whaps at the nanog hornets nest :-) Mans Nilsson (Nov 07)
- RE: RINA - scott whaps at the nanog hornets nest :-) George Bonser (Nov 07)
- Re: RINA - scott whaps at the nanog hornets nest :-) Richard A Steenbergen (Nov 07)
- RE: RINA - scott whaps at the nanog hornets nest :-) George Bonser (Nov 07)
- Re: RINA - scott whaps at the nanog hornets nest :-) Mark Smith (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Mans Nilsson (Nov 08)
- RE: RINA - scott whaps at the nanog hornets nest :-) George Bonser (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Mans Nilsson (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Jack Bates (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Valdis . Kletnieks (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Nick Hilliard (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Jack Bates (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Mans Nilsson (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Chris Adams (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Niels Bakker (Nov 09)
- RE: RINA - scott whaps at the nanog hornets nest :-) Nathan Eisenberg (Nov 09)
- Re: RINA - scott whaps at the nanog hornets nest :-) Richard A Steenbergen (Nov 07)
- Re: RINA - scott whaps at the nanog hornets nest :-) Mark Smith (Nov 08)
- Re: RINA - scott whaps at the nanog hornets nest :-) Matthew Petach (Nov 06)