# # Shorewall 1.3 - 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. This may be qualified by adding the character # ":" followed by a destination host or subnet. # # # 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. # # WARNING: Do NOT specify ADD_SNAT_ALIASES=Yes if # the address given in this column is the primary # IP address for the interface in the INTERFACE # column. # # 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. # # eth0 192.168.1.0/24 206.124.146.176 # # This would normally be done when you have a static external # IP address since it makes the processing of outgoing # packets somewhat faster. ############################################################################## #INTERFACE SUBNET ADDRESS eth0 eth1 eth0 eth2 #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE