shorewall_code/Samples/one-interface/common
teastep af87d30b67 Initial revision
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@7 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
2002-04-30 22:42:57 +00:00

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############################################################################
# Shorewall 1.2 -- /etc/shorewall/common.def
#
# This file defines the rules that are applied before a policy of
# DROP or REJECT is applied. In addition to the rules defined in this file,
# the firewall will also define a DROP rule for each subnet broadcast
# address defined in /etc/shorewall/interfaces (including "detect").
#
# Do not modify this file -- if you wish to change these rules, copy this
# file to /etc/shorewall/common and modify that file.
#
run_iptables -A common -p icmp -j icmpdef
############################################################################
# accept ACKs and RSTs that aren't related to any session so that the
# protocol stack can handle them
#
run_iptables -A common -p tcp --tcp-flags ACK ACK -j ACCEPT
run_iptables -A common -p tcp --tcp-flags RST RST -j ACCEPT
############################################################################
# NETBIOS chatter
#
run_iptables -A common -p udp --dport 137:139 -j DROP
run_iptables -A common -p udp --dport 445 -j DROP
############################################################################
# BROADCASTS
#
run_iptables -A common -d 255.255.255.255 -j DROP
run_iptables -A common -d 224.0.0.0/4 -j DROP
#
# The following rule is non-standard and compensates for tardy
# DNS replies
#
run_iptables -A common -p udp --sport 53 -mstate --state NEW -j DROP