[CALUG] Gigabit Ethernet

Jim Bauer jfbauer at comcast.net
Thu Oct 20 18:36:57 CDT 2005

On Wednesday 19 October 2005 18:30, Ray Lischner wrote:
> So why doesn't PMTU discovery work in this case? Why can't the jumbo
> frame device discover the path MTU is only 1500 (or whatever) and send
> frames accordingly when it needs to talk to that device?

It can't discover the PMTU is only 1500 as it won't get
the necessary ICMP error packet because the node the jumbo
frame was sent to was incapable of receiving it.  You can't
reply to what you haven't received.

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