On 1-aug-2007, at 0:31, Templin, Fred L wrote:
AFAICT, the only significance of 1500 bytes is that it is
the traditional MTU for 10/100 Ethernet gear
It's not just tradition: all members of the ethernet family have a
maximum packet size of 1500 bytes. That includes 1 and 10 Gbit
ethernet. This is necessary to allow ethernets of different speeds to
be connected together without trouble.
Given the tradition to want to "make everything look like
an Ethernet", some have suggested that 1500 bytes can be
considered as the practical "Internet cell size" in today's
Internet.
I'm guestimating that for 99% of all packets flowing over the
internet, there is at least one ethernet hop in the path, so
practically, yes, this is true as an upper limit. You don't always
get that, though, because of tunneling. Traditionally, the internet
has supported many different link technologies with many different
MTU sizes. Hopefully, we can revive that tradition.
By that measure, perhaps 1501 bytes could be
considered as a "jumbogram"?
First line of RFC 2675:
A "jumbogram" is an IPv6 packet containing a payload longer than
65,535 octets.
From http://en.wikipedia.org/wiki/Jumbo_Frames
In computer networking, jumbo frames are Ethernet frames with more
than 1500 bytes of payload (MTU).
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