#
# Shorewall 2.1 - Masquerade file
#
# /etc/shorewall/masq
#
# Use this file to define dynamic NAT (Masquerading) and to define Source NAT
# (SNAT).
#
# Columns are:
#
# INTERFACE -- Outgoing interface. This is usually your internet
# interface. If ADD_SNAT_ALIASES=Yes in
# /etc/shorewall/shorewall.conf, you may add ":" and
# a digit to indicate that you want the alias added with
# that name (e.g., eth0:0). This will allow the alias to
# be displayed with ifconfig. THAT IS THE ONLY USE FOR
# THE ALIAS NAME AND IT MAY NOT APPEAR IN ANY OTHER
# PLACE IN YOUR SHOREWALL CONFIGURATION.
#
# This may be qualified by adding the character
# ":" followed by a destination host or subnet.
#
# If you wish to inhibit the action of ADD_SNAT_ALIASES
# for this entry then include the ":" but omit the digit:
#
# eth0:
# eth2::192.0.2.32/27
#
# Normally Masq/SNAT rules are evaluated after those for
# one-to-one NAT (/etc/shorewall/nat file). If you want
# the rule to be applied before one-to-one NAT rules,
# prefix the interface name with "+":
#
# +eth0
# +eth0:192.0.2.32/27
# +eth0:2
#
# This feature should only be required if you need to
# insert rules in this file that preempt entries in
# /etc/shorewall/nat.
#
# SUBNET -- Subnet that you wish to masquerade. You can specify this as
# a subnet or as an interface. If you give the name of an
# interface, you must have iproute installed and the interface
# must be up before you start the firewall.
#
# In order to exclude a subset of the specified SUBNET, you
# may append "!" and a comma-separated list of IP addresses
# and/or subnets that you wish to exclude.
#
# Example: eth1!192.168.1.4,192.168.32.0/27
#
# In that example traffic from eth1 would be masqueraded unless
# it came from 192.168.1.4 or 196.168.32.0/27
#
# ADDRESS -- (Optional). If you specify an address here, SNAT will be
# used and this will be the source address. If
# ADD_SNAT_ALIASES is set to Yes or yes in
# /etc/shorewall/shorewall.conf then Shorewall
# will automatically add this address to the
# INTERFACE named in the first column.
#
# You may also specify a range of up to 256
# IP addresses if you want the SNAT address to
# be assigned from that range in a round-robin
# range by connection. The range is specified by
# <first ip in range>-<last ip in range>.
#
# Example: 206.124.146.177-206.124.146.180
#
# Finally, you may also specify a comma-separated
# list of ranges and/or addresses in this column.
#
# This column may not contain DNS Names.
#
# Normally, Netfilter will attempt to retain
# the source port number. You may cause
# netfilter to remap the source port by following
# an address or range (if any) by ":" and
# a port range with the format <low port>-
# <high port>. If this is done, you must
# specify "tcp" or "udp" in the PROTO column.
#
# Examples:
#
# 192.0.2.4:5000-6000
# :4000-5000
#
# If you want to leave this column empty
# but you need to specify the next column then
# place a hyphen ("-") here.
#
# PROTO -- (Optional) If you wish to restrict this entry to a
# particular protocol then enter the protocol
# name (from /etc/protocols) or number here.
#
# PORT(S) -- (Optional) If the PROTO column specifies TCP (protocol 6)
# or UDP (protocol 17) then you may list one
# or more port numbers (or names from
# /etc/services) separated by commas or you
# may list a single port range
# (<low port>:<high port>).
#
# Where a comma-separated list is given, your
# kernel and iptables must have multiport match
# support and a maximum of 15 ports may be
# listed.
#
# IPSEC -- (Optional) If you specify a value other than "-" in this
# column, you must be running kernel 2.6 and
# your kernel and iptables must include policy
# match support.
#
# Yes -- Only packets that will be encrypted using
# an ipsec policy will have their source
# address changed.
#
# No -- Only packets that will not be encrypted
# using an ipsec policy will have their
# source address changed.
#
# - or empty is the same as No providing that
# your kernel and iptables contain policy match
# support.
#
# Comma-separated list of options from the following.
# Only packets that will be encrypted via an SA that
# matches these options will have their source address
# changed.
#
# reqid=<number> where <number> is specified
# using setkey(8) using the 'unique:<number>
# option for the SPD level.
#
# spi=<number> where <number> is the SPI of
# the SA.
#
# proto=ah|esp|ipcomp
#
# mode=transport|tunnel
#
# tunnel-src=<address>[/<mask>] (only
# available with mode=tunnel)
#
# tunnel-dst=<address>[/<mask>] (only
# available with mode=tunnel)
#
# strict Means that packets must match all
# rules.
#
# next Separates rules; can only be used
# with strict..
#
# Example 1:
#
# You have a simple masquerading setup where eth0 connects to
# a DSL or cable modem and eth1 connects to your local network
# with subnet 192.168.0.0/24.
#
# Your entry in the file can be either:
#
# eth0 eth1
#
# or
#
# eth0 192.168.0.0/24
#
# Example 2:
#
# You add a router to your local network to connect subnet
# 192.168.1.0/24 which you also want to masquerade. You then
# add a second entry for eth0 to this file:
#
# eth0 192.168.1.0/24
#
# Example 3:
#
# You have an IPSEC tunnel through ipsec0 and you want to
# masquerade packets coming from 192.168.1.0/24 but only if
# these packets are destined for hosts in 10.1.1.0/24:
#
# ipsec0:10.1.1.0/24 196.168.1.0/24
#
# Example 4:
#
# You want all outgoing traffic from 192.168.1.0/24 through
# eth0 to use source address 206.124.146.176 which is NOT the
# primary address of eth0. You want 206.124.146.176 added to
# be added to eth0 with name eth0:0.
#
# eth0:0 192.168.1.0/24 206.124.146.176
#
# Example 5:
#
# You want all outgoing SMTP traffic entering the firewall
# on eth1 to be sent from eth0 with source IP address
# 206.124.146.177. You want all other outgoing traffic
# from eth1 to be sent from eth0 with source IP address
# 206.124.146.176.
#
# eth0 eth1 206.124.146.177 tcp smtp
# eth0 eth1 206.124.146.176
#
# THE ORDER OF THE ABOVE TWO RULES IS SIGNIFICANT!!!!!
#
###############################################################################
#INTERFACE SUBNET ADDRESS PROTO PORT(S) IPSEC
eth0 eth1
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE