mailing list archives
Re: exchange point media (was: Re: MAE-EAST Moving? ...)
From: John Hall <j.hall () f5 com>
Date: Thu, 22 Jun 2000 11:39:14 -0700
This is a problem for many switches that support non-ethernet interfaces.
RFC1191 does not apply to switches (only routers), but it probably should.
I've run into this problem with switches from Fore and Cabletron. I would
bet that this is a problem for most switches.
Jeff Haas wrote:
Should one install a (fast|gig)ethernet card into one's Gigaswitch
and said switch have FDDI interfaces, the switch will go from having
a 4500+ byte MTU to a 1500 byte MTU. This is even between FDDI card
to FDDI card on the same switch.
The switch will happily fragment the packet if you leave DF off.
However, if you turn it on, the switch will drop the packet silently.
The switch is unable to generate ICMP and route it back to the
Given all of this, PMTU-D breaks in these circumstances.
Jeffrey Haas - Merit RSng project - jeffhaas () merit edu
John Hall <j.hall () f5 com> F5 Networks, Inc.
Senior Test Engineer 206-505-0800
It is up to us to produce better-quality movies.
-- Lloyd Kaufman, producer of "Stuff Stephanie in the Incinerator"
Re: MAE-EAST Moving? from Tysons corner to reston VA. David Lesher (Jun 14)
Re: MAE-EAST Moving? from Tysons corner to reston VA. James Howard (Jun 14)
Re: MAE-EAST Moving? from Tysons corner to reston VA. Richard A. Steenbergen (Jun 16)