On Wed, Oct 1, 2008 at 7:00 PM, Tim Nelson <[EMAIL PROTECTED]> wrote:
> Are you blocking any ICMP traffic? PMTU (MTU path discovery) relies on ICMP 
> to automagically determine the proper MTU...
>
> On nearly all of my installations, I'm blocking EVERYTHING including ICMP on 
> the WAN and PMTU still works fine. Maybe you have it blocked elsewhere?
>

pf's state keeping allows any associated reply traffic, which includes
the requisite traffic for PMTUD.

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