action.reject

sharewall is very good

#
# Shorewall version 4 - Reject Action
#
# /usr/share/shorewall/action.Reject
#
#	The default REJECT action common rules
#
#	This action is invoked before a REJECT policy is enforced. The purpose
#	of the action is:
#
#	a) Avoid logging lots of useless cruft.
#	b) Ensure that certain ICMP packets that are necessary for successful
#	   internet operation are always ACCEPTed.
#
# IF YOU ARE HAVING CONNECTION PROBLEMS, CHANGING THIS FILE WON'T HELP!!!!!!!!!
###############################################################################
#TARGET		SOURCE	DEST	PROTO
#
# Count packets that come through here
#
COUNT
#
# Don't log 'auth' -- REJECT
#
Auth/REJECT
#
# Drop Broadcasts so they don't clutter up the log
# (broadcasts must *not* be rejected).
#
dropBcast
#
# ACCEPT critical ICMP types
#
AllowICMPs	-	-	icmp
#
# Drop packets that are in the INVALID state -- these are usually ICMP packets
# and just confuse people when they appear in the log (these ICMPs cannot be
# rejected).
#
dropInvalid
#
# Reject Microsoft noise so that it doesn't clutter up the log.
#
SMB/REJECT
DropUPnP
#
# Drop 'newnotsyn' traffic so that it doesn't get logged.
#
dropNotSyn	-	-	tcp
#
# Drop late-arriving DNS replies. These are just a nuisance and clutter up
# the log.
#
DropDNSrep
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE