Updating ipfilter on FreeBSD 6.x

[Martin Johnson <ipfilter@martinshouse.com>]

I run ipfilter on FreeBSD 6.1 (intel), using the RELENG_6_1 CVS  
branch. On the whole it's pretty solid, but sometimes traffic is  
blocked due to OOW errors, and the website www.activestate.com hangs  
unless I plug outside the firewall.
So I guess it's time to update the firewall software.

I could do an in-place update from FreeSD 6.1 to 6.2, but presumably  
the ipfilter in 6.2 is not really new enough.  Or, are all the  
important fixes been included in RELENG_6_2 now?
So: What is the recommended way to update ipfilter on FreeBSD?


Thanks for any pointers!

- Martin.