Richard Ibbotson <richard@sheflug.co.uk> typed:
:> block in log quick on ippp0 proto tcp from any to any port = 6000:6003
: Thanks for everyones help with this one.  Seems the correct syntax 
: is..
: block in log quick on ippp0 proto tcp from any to any port 6000 >< 6003
                                                    ...      5999 >< 6004

You are blocking 6001 upto 6002.  The port range rules are exclusive.

Regards,
Geoff