SuSEfirewall2 configuration for masquerading

# Copyright (c) 2000-2002 SuSE GmbH Nuernberg, Germany.  All rights reserved.
# Copyright (c) 2003,2004 SuSE Linux AG Nuernberg, Germany.  All rights reserved.
# Copyright (c) 2005-2007 SUSE LINUX Products GmbH Nuernberg, Germany.  All rights reserved.
#
# Author: Marc Heuse, 2002
#         Ludwig Nussel, 2004-2007
#
# /etc/sysconfig/SuSEfirewall2
#
# for use with /sbin/SuSEfirewall2 version 3.6
#
# ------------------------------------------------------------------------     #
# PLEASE NOTE THE FOLLOWING:
#
# Just by configuring these settings and using the SuSEfirewall2 you
# are not secure per se! There is *not* such a thing you install and
# hence you are saved from all (security) hazards.
#
# To ensure your security, you need also:
#
#   * Secure all services you are offering to untrusted networks
#     (internet) You can do this by using software which has been
#     designed with security in mind (like postfix, vsftpd, ssh),
#     setting these up without misconfiguration and praying, that
#     they have got really no holes. Apparmor can help in
#     most circumstances to reduce the risk.
#   * Do not run untrusted software. (philosophical question, can
#     you trust SuSE or any other software distributor?)
#   * Check the security of your server(s) regulary
#   * If you are using this server as a firewall/bastion host to the
#     internet for an internal network, try to run proxy services
#     for everything and disable routing on this machine.
#   * If you run DNS on the firewall: disable untrusted zone
#     transfers and either don't allow access to it from the
#     internet or run it split-brained.
#
# Good luck!
#
# Yours,
#   SuSE Security Team
#
# ------------------------------------------------------------------------
#
# Configuration HELP:
#
# If you have got any problems configuring this file, take a look at
# /usr/share/doc/packages/SuSEfirewall2/EXAMPLES or use YaST
#
#
# If you are an end-user who is NOT connected to two networks (read:
# you have got a single user system and are using a dialup to the
# internet) you just have to configure (all other settings are OK):
# 2) and maybe 9).
#
# If this server is a firewall, which should act like a proxy (no direct
# routing between both networks), or you are an end-user connected to the
# internet and to an internal network, you have to setup your proxys and
# reconfigure (all other settings are OK): 2), 3), 9) and maybe 7), 11), 14)
#
# If this server is a firewall, and should do routing/masquerading between
# the untrusted and the trusted network, you have to reconfigure (all other
# settings are OK): 2), 3), 5), 6), 9), and maybe 7), 10), 11), 12), 13),
# 14)
#
# If you want to run a DMZ in either of the above three standard setups, you
# just have to configure *additionally* 4), 9), 12), 13), 18)
#
# Please note that if you use service names, they have to exist in
# /etc/services. There is for example no service "dns", it's called
# "domain"; email is called "smtp" etc.
#
# ------------------------------------------------------------------------

## Path:    Network/Firewall/SuSEfirewall2
## Description: SuSEfirewall2 configuration
## Type:    string
## Default: any
#
# 2.)
# Which are the interfaces that point to the internet/untrusted
# networks?
#
# Enter all untrusted network devices here
#
# Format: space separated list of interface or configuration names
#
# The special keyword "any" means that packets arriving on interfaces not
# explicitly configured as int, ext or dmz will be considered external. Note:
# this setting only works for packets destined for the local machine. If you
# want forwarding or masquerading you still have to add the external interfaces
# individually. "any" can be mixed with other interface names.
#
# Examples: "ippp0 ippp1", "any dsl0"
#
# Note: alias interfaces (like eth0:1) are ignored
#
FW_DEV_EXT="eth0"

## Type:    string
#
# 3.)
# Which are the interfaces that point to the internal network?
#
# Enter all trusted network interfaces here. If you are not
# connected to a trusted network (e.g. you have just a dialup) leave
# this empty.
#
# Format: space separated list of interface or configuration names
#
# Examples: "tr0", "eth0 eth1"
#
FW_DEV_INT="eth1"

## Type:    string
#
# 4.)
# Which are the interfaces that point to the dmz or dialup network?
#
# Enter all the network devices here which point to the dmz/dialups.
# A "dmz" is a special, seperated network, which is only connected
# to the firewall, and should be reachable from the internet to
# provide services, e.g. WWW, Mail, etc. and hence is at risk from
# attacks. See /usr/share/doc/packages/SuSEfirewall2/EXAMPLES for an
# example.
#
# Note: You have to configure FW_FORWARD to define the services
# which should be available to the internet and set FW_ROUTE to yes.
#
# Format: space separated list of interface or configuration names
#
# Examples: "tr0", "eth0 eth1"
#
FW_DEV_DMZ=""

## Type:    yesno
## Default: no
#
# 5.)
# Should routing between the internet, dmz and internal network be
# activated?
#
# Set this to "yes" if you either want to masquerade internal
# machines or allow access to the dmz (or internal machines, but
# this is not a good idea).
#
# This option overrides IP_FORWARD from
# /etc/sysconfig/network/options
#
# Setting this option one alone doesn't do anything. Either activate
# masquerading with FW_MASQUERADE below if you want to masquerade
# your internal network to the internet, or configure FW_FORWARD to
# define what is allowed to be forwarded. You also need to define
# internal or dmz interfaces in FW_DEV_INT or FW_DEV_DMZ.
#
# defaults to "no" if not set
#
FW_ROUTE="yes"

## Type:    yesno
## Default: no
#
# 6.)
# Do you want to masquerade internal networks to the outside?
#
# Requires: FW_DEV_INT or FW_DEV_DMZ, FW_ROUTE, FW_MASQ_DEV
#
# "Masquerading" means that all your internal machines which use
# services on the internet seem to come from your firewall. Please
# note that it is more secure to communicate via proxies to the
# internet than to use masquerading.
#
# This option is required for FW_MASQ_NETS and FW_FORWARD_MASQ.
#
# defaults to "no" if not set
#
FW_MASQUERADE="yes"

## Type:    string
## Default:     zone:ext
#
# 6a.)
# You also have to define on which interfaces to masquerade on.
# Those are usually the same as the external interfaces. Most users
# can leave the default.
#
# The special string "zone:" concatenated with the name of a zone
# means to take all interfaces in the specified zone.
#
# Old version of SuSEfirewall2 used a shell variable ($FW_DEV_EXT)
# here. That method is deprecated as it breaks auto detection of
# interfaces. Please use zone:ext instead.
#
# Examples: "ippp0", "zone:ext"
#
FW_MASQ_DEV="zone:ext"

## Type:    string
## Default: 0/0
#
# Which internal computers/networks are allowed to access the
# internet via masquerading (not via proxys on the firewall)?
#
# Format: space separated list of
#  <source network>[,<destination network>,<protocol>[,port[:port]]
#
#  If the protocol is icmp then port is interpreted as icmp type
#
# Examples: - "0/0" unrestricted access to the internet
#           - "10.0.0.0/8" allows the whole 10.0.0.0 network with
#             unrestricted access.
#           - "10.0.1.0/24,0/0,tcp,80 10.0.1.0/24,0/0,tcp,21" allows
#             the 10.0.1.0 network to use www/ftp to the internet. -
#           - "10.0.1.0/24,0/0,tcp,1024:65535 10.0.2.0/24" the
#             10.0.1.0/24 network is allowed to access unprivileged
#             ports whereas 10.0.2.0/24 is granted unrestricted
#             access.
#           - "0/0,!10.0.0.0/8" unrestricted access to the internet
#             with the exception of 10.0.0.8 which will not be
#             masqueraded.
#
FW_MASQ_NETS=""

## Type:    string
## Default: 0/0
#
# Which computers/networks should be excluded from beeing masqueraded?
# Note that this only affects the POSTROUTING chain of the nat
# table. Ie the forwarding rules installed by FW_MASQ_NETS do not
# include the listed exceptions.
# *** Since you may use FW_NOMASQ_NETS together with IPsec make sure
# that the policy database is loaded even when the tunnel is not up
# yet. Otherwise packets to the listed networks will be forwarded to
# the internet unencrypted! ***
#
# Format: space separated list of
#  <source network>[,<destination network>,<protocol>[,port[:port]]
#
#  If the protocol is icmp then port is interpreted as icmp type
#
# Examples: - "0/0,10.0.0.0/8" do not masquerade packets from
#             anywhere to the 10.0.0.0/8 network
#
FW_NOMASQ_NETS=""

## Type:    yesno
## Default: no
#
# 7.)
# Do you want to protect the firewall from the internal network?
# Requires: FW_DEV_INT
#
# If you set this to "yes", internal machines may only access
# services on the firewall you explicitly allow. If you set this to
# "no", any internal user can connect (and attack) any service on
# the firewall.
#
# defaults to "yes" if not set
#
# see also FW_REJECT_INT
#
FW_PROTECT_FROM_INT="no"

## Type:    string
#
# 9.)
# Which TCP services _on the firewall_ should be accessible from
# untrusted networks?
#
# Enter all ports or known portnames below, seperated by a space.
# TCP services (e.g. SMTP, WWW) must be set in FW_SERVICES_*_TCP, and
# UDP services (e.g. syslog) must be set in FW_SERVICES_*_UDP.
# e.g. if a webserver on the firewall should be accessible from the internet:
# FW_SERVICES_EXT_TCP="www"
# e.g. if the firewall should receive syslog messages from the dmz:
# FW_SERVICES_DMZ_UDP="syslog"
# For IP protocols (like GRE for PPTP, or OSPF for routing) you need to set
# FW_SERVICES_*_IP with the protocol name or number (see /etc/protocols)
#
# Format: space separated list of ports, port ranges or well known
#         service names (see /etc/services)
#
# Examples: "ssh", "123 514", "3200:3299", "ftp 22 telnet 512:514"
#
FW_SERVICES_EXT_TCP="443 80"

## Type:    string
#
# Which UDP services _on the firewall_ should be accessible from
# untrusted networks?
#
# see comments for FW_SERVICES_EXT_TCP
#
# Example: "53"
#
FW_SERVICES_EXT_UDP=""

## Type:    string
#
# Which UDP services _on the firewall_ should be accessible from
# untrusted networks?
#
# Usually for VPN/Routing which END at the firewall
#
# Example: "esp"
#
FW_SERVICES_EXT_IP=""

## Type:        string
#
# Which RPC services _on the firewall_ should be accessible from
# untrusted networks?
#
# Port numbers of RPC services are dynamically assigned by the
# portmapper. Therefore "rpcinfo -p localhost" has to be used to
# automatically determine the currently assigned port for the
# services specified here.
#
# USE WITH CAUTION!
# regular users can register rpc services and therefore may be able
# to have SuSEfirewall2 open arbitrary ports
#
# Example: "mountd nfs"
FW_SERVICES_EXT_RPC=""

## Type:        string
#
# Which services _on the firewall_ should be accessible from
# untrusted networks?
#
# Packages can drop a configuration file that specifies all required
# ports into /usr/share/SuSEfirewall2/services . That is handy for
# services that require multiple ports or protocols. Enter the space
# separated list of configuration files you want to load.
#
# Example: "samba-server nfs-server"
FW_CONFIGURATIONS_EXT="sshd"

## Type:    string
#
# see comments for FW_SERVICES_EXT_TCP
FW_SERVICES_DMZ_TCP=""

## Type:    string
#
# see comments for FW_SERVICES_EXT_UDP
FW_SERVICES_DMZ_UDP=""

## Type:    string
#
# see comments for FW_SERVICES_EXT_IP
FW_SERVICES_DMZ_IP=""

## Type:        string
#
# see comments for FW_SERVICES_EXT_RPC
FW_SERVICES_DMZ_RPC=""

## Type:        string
#
# see comments for FW_CONFIGURATIONS_EXT
FW_CONFIGURATIONS_DMZ=""

## Type:    string
#
# see comments for FW_SERVICES_EXT_TCP
FW_SERVICES_INT_TCP=""

## Type:    string
#
# see comments for FW_SERVICES_EXT_UDP
FW_SERVICES_INT_UDP=""

## Type:    string
#
# see comments for FW_SERVICES_EXT_IP
FW_SERVICES_INT_IP=""

## Type:        string
#
# see comments for FW_SERVICES_EXT_RPC
FW_SERVICES_INT_RPC=""

## Type:        string
#
# see comments for FW_CONFIGURATIONS_EXT
FW_CONFIGURATIONS_INT=""

## Type: string
#
# Packets to silently drop without log message
#
# Format: space separated list of net,protocol[,port][,sport]
# Example: "0/0,tcp,445 0/0,udp,4662"
#
# The special value _rpc_ is recognized as protocol and means that dport is
# interpreted as rpc service name. See FW_SERVICES_EXT_RPC for
# details.
#
FW_SERVICES_DROP_EXT=""

## Type: string
## Default: 0/0,tcp,113
#
# Packets to silently reject without log message. Common usage is
# TCP port 113 which if dropped would cause long timeouts when
# sending mail or connecting to IRC servers.
#
# Format: space separated list of net,protocol[,dport][,sport]
# Example: "0/0,tcp,113"
#
# The special value _rpc_ is recognized as protocol and means that dport is
# interpreted as rpc service name. See FW_SERVICES_EXT_RPC for
# details.
#
FW_SERVICES_REJECT_EXT="0/0,tcp,113"

## Type: string
## Default:
#
# Services to allow. This is a more generic form of FW_SERVICES_{IP,UDP,TCP}
# and more specific than FW_TRUSTED_NETS
#
# Format: space separated list of net,protocol[,dport[,sport[,flags]]]
# Example: "0/0,tcp,22"
#
# Supported flags are
#   hitcount=NUMBER     : ipt_recent --hitcount parameter
#   blockseconds=NUMBER : ipt_recent --seconds parameter
#   recentname=NAME     : ipt_recent --name parameter
# Example:
#    Allow max three ssh connects per minute from the same IP address:
#      "0/0,tcp,22,,hitcount=3,blockseconds=60,recentname=ssh"
#
# The special value _rpc_ is recognized as protocol and means that dport is
# interpreted as rpc service name. See FW_SERVICES_EXT_RPC for
# details.
#
FW_SERVICES_ACCEPT_EXT=""

## Type:    string
#
# 10.)
# Which services should be accessible from 'trusted' hosts or nets?
#
# Define trusted hosts or networks (doesn't matter whether they are internal or
# external) and the services (tcp,udp,icmp) they are allowed to use. This can
# be used instead of FW_SERVICES_* for further access restriction. Please note
# that this is no replacement for authentication since IP addresses can be
# spoofed. Also note that trusted hosts/nets are not allowed to ping the
# firewall until you also permit icmp.
#
# Format: space separated list of network[,protocol[,port]]
# in case of icmp, port means the icmp type
#
# Example: "172.20.1.1 172.20.0.0/16 1.1.1.1,icmp 2.2.2.2,tcp,22"
#
FW_TRUSTED_NETS=""

## Type:    string
## Default:
#
# 11.)
# Specify which ports are allowed to access unprivileged ports (>1023)
#
# Format: yes, no or space separated list of ports
#
# You may either allow everyone from anyport access to your highports ("yes"),
# disallow anyone ("no"), anyone who comes from a defined port (portnumber or
# known portname). Note that this is easy to circumvent! The best choice is to
# keep this option unset or set to 'no'
#
# defaults to "no" if not set (good choice)
#
# Note: Use of this variable is deprecated and it will likely be
# removed in the future. If you think it should be kept please
# report your use case at
# http://forge.novell.com/modules/xfmod/project/?susefirewall2
#
FW_ALLOW_INCOMING_HIGHPORTS_TCP=""

## Type:    string
## Default:
#
# See FW_ALLOW_INCOMING_HIGHPORTS_TCP
#
# defaults to "no" if not set (good choice)
#
# Note: Use of this variable is deprecated and it will likely be
# removed in the future. If you think it should be kept please
# report your use case at
# http://forge.novell.com/modules/xfmod/project/?susefirewall2
#
FW_ALLOW_INCOMING_HIGHPORTS_UDP=""

## Type:    string
#
# 13.)
# Which services or networks are allowed to be routed through the
# firewall, no matter which zone they are in?
# Requires: FW_ROUTE
#
# With this option you may allow access to e.g. your mailserver. The
# machines must have valid, non-private, IP addresses which were
# assigned to you by your ISP. This opens a direct link to the
# specified network, so please think twice befor using this option!
#
# Format: space separated list of
#    <source network>,<destination network>[,protocol[,port[,flags]]]
#
#  If the protocol is icmp then port is interpreted as icmp type
#
#  The only flag currently supported is 'ipsec' which means to only
#  match packets that originate from an IPsec tunnel
#
# Examples: - "1.1.1.1,2.2.2.2" allow the host 1.1.1.1 to access any
#             service on the host 2.2.2.2
#           - "3.3.3.3/16,4.4.4.4/24" allow the network 3.3.3.3/16
#             to access any service in the network 4.4.4.4/24
#           - "5.5.5.5,6.6.6.6,igmp" allow routing of IGMP messages
#              from 5.5.5.5 to 6.6.6.6
#           - "0/0,0/0,udp,514" always permit udp port 514 to pass
#             the firewall
#           - "192.168.1.0/24,10.10.0.0/16,,,ipsec \
#              10.10.0.0/16,192.168.1.0/24,,,ipsec" permit traffic
#              from 192.168.1.0/24 to 10.10.0.0/16 and vice versa
#              provided that both networks are connected via an
#              IPsec tunnel.
#           - "fd76:9dbb:91a3:1::/64,fd76:9dbb:91a3:4::/64,tcp,ssh"
#              allow ssh from one IPv6 network to another
#
FW_FORWARD=""

## Type:    string
#
# 13a.)
#
# same as FW_FORWARD but packages are rejected instead of accepted
#
# Requires: FW_ROUTE
#
FW_FORWARD_REJECT=""

## Type:    string
#
# 13b.)
#
# same as FW_FORWARD but packages are dropped instead of accepted
#
# Requires: FW_ROUTE
#
FW_FORWARD_DROP=""

## Type:    string
#
# 14.)
# Which services accessed from the internet should be allowed to masqueraded
# servers (on the internal network or dmz)?
# Requires: FW_ROUTE
#
# With this option you may allow access to e.g. your mailserver. The
# machines must be in a masqueraded segment and may not have public
# IP addesses! Hint: if FW_DEV_MASQ is set to the external interface
# you have to set FW_FORWARD from internal to DMZ for the service as
# well to allow access from internal!
#
# Please note that this should *not* be used for security reasons!
# You are opening a hole to your precious internal network. If e.g.
# the webserver there is compromised - your full internal network is
# compromised!
#
# Format: space separated list of
#    <source network>,<ip to forward to>,<protocol>,<port>[,redirect port,[destination ip]]
#
# Protocol must be either tcp or udp
#
# Examples: - "4.0.0.0/8,10.0.0.10,tcp,80" forward all tcp request on
#             port 80 coming from the 4.0.0.0/8 network to the
#             internal server 10.10.0.10
#           - "4.0.0.0/8,10.0.0.10,tcp,80,81" forward all tcp request on
#             port 80 coming from the 4.0.0.0/8 network to the
#             internal server 10.10.0.10 on port 81
#           - "200.200.200.0/24,10.0.0.10,tcp,80,81,202.202.202.202"
#             the network 200.200.200.0/24 trying to access the
#             address 202.202.202.202 on port 80 will be forwarded
#             to the internal server 10.0.0.10 on port 81
#
# Note: du to inconsitent iptables behaviour only port numbers are possible but
# no service names (https://bugzilla.netfilter.org/bugzilla/show_bug.cgi?id=273)
#
FW_FORWARD_MASQ=""

## Type:    string
#
# 15.)
# Which accesses to services should be redirected to a local port on
# the firewall machine?
#
# This option can be used to force all internal users to surf via
# your squid proxy, or transparently redirect incoming webtraffic to
# a secure webserver.
#
# Format: list of <source network>[,<destination network>,<protocol>[,dport[:lport]]
# Where protocol is either tcp or udp. dport is the original
# destination port and lport the port on the local machine to
# redirect the traffic to
#
# An exclamation mark in front of source or destination network
# means everything EXCEPT the specified network
#
# Example: "10.0.0.0/8,0/0,tcp,80,3128 0/0,172.20.1.1,tcp,80,8080"
#
# Note: contrary to previous SuSEfirewall2 versions it is no longer necessary
# to additionally open the local port
FW_REDIRECT=""

## Type:    yesno
## Default: yes
#
# 16.)
# Which kind of packets should be logged?
#
# When set to "yes", packages that got dropped and are considered
# 'critical' will be logged. Such packets include for example
# spoofed packets, tcp connection requests and certain icmp types.
#
# defaults to "yes" if not set
#
FW_LOG_DROP_CRIT="yes"

## Type:    yesno
## Default: no
#
# whether all dropped packets should be logged
#
# Note: for broadcasts to be logged you also need to set
# FW_IGNORE_FW_BROADCAST_* to 'no'
#
# defaults to "no" if not set
#
FW_LOG_DROP_ALL="no"

## Type:    yesno
## Default: yes
#
# When set to "yes", packages that got accepted and are considered
# 'critical' will be logged. Such packets include for example tcp
# connection requests, rpc connection requests, access to high
# udp/tcp port and forwarded pakets.
#
# defaults to "yes" if not set
#
FW_LOG_ACCEPT_CRIT="yes"

## Type:    yesno
## Default: no
#
# whether all accepted packets should be logged
#
# Note: setting this to 'yes' causes _LOTS_ of log entries and may
# fill your disk quickly. It also disables FW_LOG_LIMIT
#
# defaults to "no" if not set
#
FW_LOG_ACCEPT_ALL="no"

## Type:    string
#
# How many packets per time unit get logged for each logging rule.
# When empty a default of 3/minute is used to prevent port scans
# flooding your log files. For desktop usage it's a good idea to
# have the limit, if you are using logfile analysis tools however
# you might want to disable it.
#
# Set to 'no' to disable the rate limit. Setting FW_LOG_ACCEPT_ALL
# to 'yes' disables this option as well.
#
# Format: a digit and suffix /second, /minute, /hour or /day
FW_LOG_LIMIT=""

## Type:    string
#
# iptables logging option. Must end with --log-prefix and some prefix
# characters
#
# You may specify an alternative logging target by starting the
# string with "-j ". E.g. "-j ULOG --ulog-prefix SFW2"
#
# only change this if you know what you are doing!
FW_LOG=""

## Type:    yesno
## Default: yes
#
# 17.)
# Do you want to enable additional kernel TCP/IP security features?
# If set to yes, some obscure kernel options are set.
# (icmp_ignore_bogus_error_responses, icmp_echoreply_rate,
#  icmp_destunreach_rate, icmp_paramprob_rate, icmp_timeexeed_rate,
#  ip_local_port_range, log_martians, rp_filter, routing flush,
#  bootp_relay, proxy_arp, secure_redirects, accept_source_route
#  icmp_echo_ignore_broadcasts, ipfrag_time)
#
# Tip: Set this to "no" until you have verified that you have got a
# configuration which works for you. Then set this to "yes" and keep it
# if everything still works. (It should!) ;-)
#
# Choice: "yes" or "no", if not set defaults to "yes"
#
FW_KERNEL_SECURITY="yes"

## Type:    yesno
## Default: no
#
# 18.)
# Keep the routing set on, if the firewall rules are unloaded?
# REQUIRES: FW_ROUTE
#
# Choices "yes" or "no", if not set defaults to "no"
#
FW_STOP_KEEP_ROUTING_STATE="no"

## Type:    yesno
## Default: yes
#
# 19.)
# Allow the firewall to reply to icmp echo requests
#
# defaults to "no" if not set
#
FW_ALLOW_PING_FW="yes"

## Type:    yesno
## Default: no
#
# 19a.)
# Allow hosts in the dmz to be pinged from hosts in other zones even
# if neither FW_FORWARD nor FW_MASQUERADE is set
#
# Requires: FW_ROUTE
#
# defaults to "no" if not set
#
FW_ALLOW_PING_DMZ="no"

## Type:    yesno
## Default: no
#
# 19b.)
# Allow hosts in the external zone to be pinged from hosts in other
# zones even if neither FW_FORWARD nor FW_MASQUERADE is set
#
# Requires: FW_ROUTE
#
# defaults to "no" if not set
#
FW_ALLOW_PING_EXT="no"

## Type:    yesno
## Default: yes
#
# 21.)
# Allow ICMP sourcequench from your ISP?
#
# If set to yes, the firewall will notice when connection is choking, however
# this opens yourself to a denial of service attack. Choose your poison.
#
# Defaults to "yes" if not set
#
FW_ALLOW_FW_SOURCEQUENCH=""

## Type:    string(yes,no)
#
# 22.)
# Allow IP Broadcasts?
#
# Whether the firewall allows broadcasts packets.
# Broadcasts are used for e.g. for Netbios/Samba, RIP, OSPF and Games.
#
# If you want to drop broadcasts however ignore the annoying log entries, set
# FW_IGNORE_FW_BROADCAST_* to yes.
#
# Note that if you allow specifc ports here it just means that broadcast
# packets for that port are not dropped. You still need to set
# FW_SERVICES_*_UDP to actually allow regular unicast packets to
# reach the applications.
#
# Format: either
#           - "yes" or "no"
#           - list of udp destination ports
#
# Examples: - "631 137" allow broadcast packets on port 631 and 137
#              to enter the machine but drop any other broadcasts
#           - "yes" do not install any extra drop rules for
#              broadcast packets. They'll be treated just as unicast
#              packets in this case.
#           - "no" drop all broadcast packets before other filtering
#              rules
#
# defaults to "no" if not set
#
FW_ALLOW_FW_BROADCAST_EXT="no"

## Type:    string
#
# see comments for FW_ALLOW_FW_BROADCAST_EXT
FW_ALLOW_FW_BROADCAST_INT="no"

## Type:    string
#
# see comments for FW_ALLOW_FW_BROADCAST_EXT
FW_ALLOW_FW_BROADCAST_DMZ="no"

## Type:    string(yes,no)
#
# Suppress logging of dropped broadcast packets. Useful if you don't allow
# broadcasts on a LAN interface.
#
# This setting only affects packets that are not allowed according
# to FW_ALLOW_FW_BROADCAST_*
#
# Format: either
#           - "yes" or "no"
#           - list of udp destination ports
#
# Examples: - "631 137" silently drop broadcast packets on port 631 and 137
#           - "yes" do not log dropped broadcast packets
#           - "no" log all dropped broadcast packets
#
#
# defaults to "no" if not set
FW_IGNORE_FW_BROADCAST_EXT="yes"

## Type:    string
#
# see comments for FW_IGNORE_FW_BROADCAST_EXT
FW_IGNORE_FW_BROADCAST_INT="no"

## Type:    string
#
# see comments for FW_IGNORE_FW_BROADCAST_EXT
FW_IGNORE_FW_BROADCAST_DMZ="no"

## Type:    list(yes,no,int,ext,dmz,)
## Default: no
#
# 23.)
# Specifies whether routing between interfaces of the same zone should be allowed
# Requires: FW_ROUTE="yes"
#
# Set this to allow routing between interfaces in the same zone,
# e.g. between all internet interfaces, or all internal network
# interfaces.
#
# Caution: Keep in mind that "yes" affects all zones. ie even if you
# need inter-zone routing only in the internal zone setting this
# parameter to "yes" would allow routing between all external
# interfaces as well. It's better to use
# FW_ALLOW_CLASS_ROUTING="int" in this case.
#
# Choice: "yes", "no", or space separate list of zone names
#
# Defaults to "no" if not set
#
FW_ALLOW_CLASS_ROUTING=""

## Type:    string
#
# 25.)
# Do you want to load customary rules from a file?
#
# This is really an expert option. NO HELP WILL BE GIVEN FOR THIS!
# READ THE EXAMPLE CUSTOMARY FILE AT /etc/sysconfig/scripts/SuSEfirewall2-custom
#
#FW_CUSTOMRULES="/etc/sysconfig/scripts/SuSEfirewall2-custom"
FW_CUSTOMRULES=""

## Type:    yesno
## Default: no
#
# 26.)
# Do you want to REJECT packets instead of DROPing?
#
# DROPing (which is the default) will make portscans and attacks much
# slower, as no replies to the packets will be sent. REJECTing means, that
# for every illegal packet, a connection reject packet is sent to the
# sender.
#
# Choice: "yes" or "no", if not set defaults to "no"
#
# Defaults to "no" if not set
#
# You may override this value on a per zone basis by using a zone
# specific variable, e.g. FW_REJECT_DMZ="yes"
#
FW_REJECT=""

## Type:    yesno
## Default: no
#
# see FW_REJECT for description
#
# default config file setting is "yes" assuming that slowing down
# portscans is not strictly required in the internal zone even if
# you protect yourself from the internal zone
#
FW_REJECT_INT="yes"

## Type:    string
#
# 27.)
# Tuning your upstream a little bit via HTB (Hierarchical Token Bucket)
# for more information about HTB see http://www.lartc.org
#
# If your download collapses while you have a parallel upload,
# this parameter might be an option for you. It manages your
# upload stream and reserves bandwidth for special packets like
# TCP ACK packets or interactive SSH.
# It's a list of devices and maximum bandwidth in kbit.
# For example, the german TDSL account, provides 128kbit/s upstream
# and 768kbit/s downstream. We can only tune the upstream.
#
# Example:
# If you want to tune a 128kbit/s upstream DSL device like german TDSL set
# the following values:
# FW_HTB_TUNE_DEV="dsl0,125"
# where dsl0 is your pppoe device and 125 stands for 125kbit/s upstream
#
# you might wonder why 125kbit/s and not 128kbit/s. Well practically you'll
# get a better performance if you keep the value a few percent under your
# real maximum upload bandwidth, to prevent the DSL modem from queuing traffic in
# it's own buffers because queing is done by us now.
# So for a 256kbit upstream
#   FW_HTB_TUNE_DEV="dsl0,250"
# might be a better value than "dsl0,256". There is no perfect value for a
# special kind of modem. The perfect value depends on what kind of traffic you
# have on your line but 5% under your maximum upstream might be a good start.
# Everthing else is special fine tuning.
# If you want to know more about the technical background,
# http://tldp.org/HOWTO/ADSL-Bandwidth-Management-HOWTO/
# is a good start
#
FW_HTB_TUNE_DEV=""

## Type:    list(no,drop,reject)
## Default: drop
#
# 28.)
# What to do with IPv6 Packets?
#
# On older kernels ip6tables was not stateful so it's not possible to implement
# the same features as for IPv4 on such machines. For these there are three
# choices:
#
# - no: do not set any IPv6 rules at all. Your Host will allow any IPv6
#   traffic unless you setup your own rules.
#
# - drop: drop all IPv6 packets.
#
# - reject: reject all IPv6 packets. This is the default if stateful matching is
#   not available.
#
# Disallowing IPv6 packets may lead to long timeouts when connecting to IPv6
# Adresses. See FW_IPv6_REJECT_OUTGOING to avoid this.
#
# Leave empty to automatically detect whether your kernel supports stateful matching.
#
FW_IPv6=""

## Type:    yesno
## Default: yes
#
# 28a.)
# Reject outgoing IPv6 Packets?
#
# Set to yes to avoid timeouts because of dropped IPv6 Packets. This Option
# does only make sense with FW_IPv6 != no
#
# Defaults to "yes" if not set
#
FW_IPv6_REJECT_OUTGOING=""

## Type:    list(yes,no,int,ext,dmz,)
## Default: no
#
# 29.)
# Trust level of IPsec packets.
#
# You do not need to change this if you do not intend to run
# services that should only be available trough an IPsec tunnel.
#
# The value specifies how much IPsec packets are trusted. 'int', 'ext' or 'dmz'
# are the respective zones. 'yes' is the same as 'int. 'no' means that IPsec
# packets belong to the same zone as the interface they arrive on.
#
# Note: you still need to explicitely allow IPsec traffic.
# Example:
#   FW_IPSEC_TRUST="int"
#   FW_SERVICES_EXT_IP="esp"
#   FW_SERVICES_EXT_UDP="isakmp"
#   FW_PROTECT_FROM_INT="no"
#
# Defaults to "no" if not set
#
FW_IPSEC_TRUST="no"

## Type:    string
## Default:
#
# 30.)
# Define additional firewall zones
#
# The built-in zones INT, EXT and DMZ must not be listed here. Names
# of additional zones must only contain lowercase ascii characters.
# To define rules for the additional zone, take the approriate
# variable for a built-in zone and substitute INT/EXT/DMZ with the
# name of the additional zone.
#
# Example:
#   FW_ZONES="wlan"
#   FW_DEV_wlan="wlan0"
#   FW_SERVICES_wlan_TCP="80"
#   FW_ALLOW_FW_BROADCAST_wlan="yes"
#
FW_ZONES=""

## Type:    list(yes,no,auto,)
## Default:
#
# 31.)
# Whether to use iptables-batch
#
# iptables-batch commits all rules in an almost atomic way similar
# to iptables-restore. This avoids excessive iptables calls and race
# conditions.
#
# Choice:
#     - yes: use iptables-batch if available and warn if it isn't
#     - no: don't use iptables-batch
#     - auto: use iptables-batch if available, silently fall back to
#       iptables if it isn't
#
# Defaults to "auto" if not set
#
FW_USE_IPTABLES_BATCH=""

## Type:    string
## Default:
#
# 32.)
# Which additional kernel modules to load at startup
#
# Example:
#   FW_LOAD_MODULES="ip_conntrack_ftp ip_nat_ftp"
#
FW_LOAD_MODULES="nf_conntrack_netbios_ns"

## Type:    string
## Default:
#
# 33.)
# Bridge interfaces without IP address
#
# Traffic on bridge interfaces like the one used by xen appears to
# enter and leave on the same interface. Add such interfaces here in
# order to install special permitting rules for them.
#
# Format: list of interface names separated by space
#
# Example:
#   FW_FORWARD_ALWAYS_INOUT_DEV="xenbr0"
#
# FW_FORWARD_ALWAYS_INOUT_DEV="xenbr+"
FW_SERVICES_ACCEPT_INT=""
FW_SERVICES_ACCEPT_DMZ=""
FW_FORWARD_ALWAYS_INOUT_DEV=""
FW_SERVICES_ACCEPT_RELATED_EXT=""
FW_SERVICES_ACCEPT_RELATED_INT=""
FW_SERVICES_ACCEPT_RELATED_DMZ=""