ipv6 connection hang

[Mark Felder]

Hi all,

mwi1# uname -a
FreeBSD mwi1.coffeenet.org 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #5  
r239731: Mon Aug 27 09:53:18 CDT 2012      
root at mwi1.coffeenet.org:/usr/obj/usr/src/sys/GENERIC  amd64

My ipv6 connections hang for several seconds when this scrub rule is  
enabled:

scrub all reassemble tcp no-df random-id

This really agitates my browser and email client making them nearly  
useless at times. Disabling that rule makes ipv6 connections respond  
instantly as expected. Is this a known regression? My network interface is  
using the re(4) driver.


Thanks!