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Ubuntu下配置shorewall防火墙 |
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PKTTYPE=Yes
#
# DROP INVALID PACKETS
#
# Netfilter classifies packets relative to its connection tracking table into
# four states:
#
# NEW - thes packet initiates a new connection
# ESTABLISHED - thes packet is part of an established connection
# RELATED - thes packet is related to an established connection; it may
# establish a new connection
# INVALID - the packet does not related to the table in any sensible way.
#
# Recent 2.6 kernels include code that evaluates TCP packets based on TCP
# Window analysis. This can cause packets that were previously classified as
# NEW or ESTABLISHED to be classified as INVALID.
#
# The new kernel code can be disabled by including this command in your
# /etc/shorewall/init file:
#
# echo 1 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_be_liberal
#
# Additional kernel logging about INVALID TCP packets may be obtained by
# adding this command to /etc/shorewall/init:
#
# echo 1 > /proc/sys/net/ipv4/netfilter/ip_conntrack_log_invalid
#
# Traditionally, Shorewall has dropped INVALID TCP packets early. The DROPINVALID
# option allows INVALID packets to be passed through the normal rules chains by
# setting DROPINVALID=No.
#
# If not specified or if specified as empty (e.g., DROPINVALID="") then
# DROPINVALID=Yes is assumed.
DROPINVALID=No
#
# RFC 1918 BEHAVIOR
#
# Traditionally, the RETURN target in the 'rfc1918' file has caused 'norfc1918'
# processing to cease for a packet if the packet's source IP address matches
# the rule. Thus, if you have:
#
# SUBNETS TARGET
# 192.168.1.0/24 RETURN
#
# then traffic from 192.168.1.4 to 10.0.3.9 will be accepted even though you
# also have:
#
# SUBNETS TARGET
# 10.0.0.0/8 logdrop
#
# Setting RFC1918_STRICT=Yes will cause such traffic to be logged and dropped
# since while the packet's source matches the RETURN rule, the packet's
# destination matches the 'logdrop' rule.
#
# If not specified or specified as empty (e.g., RFC1918_STRICT="") then
# RFC1918_STRICT=No is assumed.
#
# WARNING: RFC1918_STRICT=Yes requires that your kernel and iptables support
# 'conntrack state' match.
RFC1918_STRICT=No
#
# MACLIST caching
#
# If your iptables and kernel support the "Recent Match" (see the output of
# "shorewall check" near the top), you can cache the results of a 'maclist'
# file lookup and thus reduce the overhead associated with MAC Verification
# (/etc/shorewall/maclist).
#
# When a new connection arrives from a 'maclist' interface, the packet passes
# through then list of entries for that interface in /etc/shorewall/maclist. If
# there is a match then the source IP address is added to the 'Recent' set for
# that interface. Subsequent connection attempts from that IP address occuring
# within $MACLIST_TTL seconds will be accepted without having to scan all of
# the entries. After $MACLIST_TTL from the first accepted connection request,
# the next connection request from that IP address will be checked against
# the entire list.
#
# If MACLIST_TTL is not specified or is specified as empty (e.g,
# MACLIST_TTL="" or is specified as zero then 'maclist' lookups will not
# be cached.
MACLIST_TTL=
################################################################################
# P A C K E T D I S P O S I T I O N
################################################################################
#
# BLACKLIST DISPOSITION
#
# Set this variable to the action that you want to perform on packets from
# Blacklisted systems. Must be DROP or REJECT. If not set or set to empty,
# DROP is assumed.
#
BLACKLIST_DISPOSITION=DROP
#
# MAC List Disposition
#
# This variable determines the disposition of connection requests arriving
# on interfaces that have the 'maclist' option and that are from a device
# that is not listed for that interface in /etc/shorewall/maclist. Valid
# values are ACCEPT, DROP and REJECT. If not specified or specified as
# empty (MACLIST_DISPOSITION="") then REJECT is assumed
MACLIST_DISPOSITION=REJECT
#
# TCP FLAGS Disposition
#
# This variable determins the disposition of packets having an invalid
# combination of TCP flags that are received on interfaces having the
# 'tcpflags' option specified in /etc/shorewall/interfaces or in
# /etc/shorewall/hosts. If not specified or specified as empty
# (TCP_FLAGS_DISPOSITION="") then DROP is assumed.
TCP_FLAGS_DISPOSITION=DROP
#LAST LINE -- DO NOT REMOVE
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