nanog mailing list archives
Re: Ethernet NAPs (was Re: Miami ...)
From: RJ Atkinson <rja () inet org>
Date: Thu, 23 Aug 2001 10:28:10 -0400
At 10:18 23/08/01, John Kristoff wrote:
Certainly. In a nutshell, it might be best to take steps to avoid fragmentation elsewhere in the network. Perhaps a rule of thumb that should be stressed is to use jumbo frames if you know for sure the other end system(s) support it, otherwise default to 1500.
Or just use Path MTU Discovery. For IP traffic that is traversing more than one layer-2 network, the variety in network technologies (e.g. ATM, SMDS, POS, Radio, Satellite, other) means that even ~1500 byte IP frames might not always work end-to-end. For example, I know of several commercial IP/SATCOM systems that have an MTU of 576 bytes. Many ISPs, not all, seem to try to engineer an end-to-end MTU of 4470 (that number chosen for historical reasons relating to FDDI). Some ISPs use a smaller MTU number and some use a higher MTU number. Ran rja () inet org
Current thread:
- Re: Ethernet NAPs (was Re: Miami ...), (continued)
- Re: Ethernet NAPs (was Re: Miami ...) Leo Bicknell (Aug 22)
- Re: Ethernet NAPs (was Re: Miami ...) Dan Hollis (Aug 22)
- Re: Ethernet NAPs (was Re: Miami ...) Miquel van Smoorenburg (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) Mikael Abrahamsson (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) RJ Atkinson (Aug 22)
- Re: Ethernet NAPs (was Re: Miami ...) Mikael Abrahamsson (Aug 22)
- Re: Ethernet NAPs RJ Atkinson (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) John Kristoff (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) Mikael Abrahamsson (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) John Kristoff (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) RJ Atkinson (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) Miquel van Smoorenburg (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) RJ Atkinson (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) Antony Antony (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) RJ Atkinson (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) Antony (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) Greg Maxwell (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) Greg Maxwell (Aug 23)
- Re: Ethernet NAPs (was Re: Miami ...) RJ Atkinson (Aug 23)