>> 	I beleive we must not do that.
>Then how do you correct a situation where MTU is too small and some remote
>site is doing PMTU discovery _and_ blocking ICMP packets?  Yes, the problem
>should be fixed at the remote site, but what if you NEED to use that site
>and they do NOT fix the problem?

	if the your web client is contacting broken web server (or a web
	server behind wrongly configured router) advertise smaller TCP MSS.

itojun