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242 lines
7.7 KiB
Plaintext
242 lines
7.7 KiB
Plaintext
#
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# Shorewall version 3.2 - Sample Masq file for three-interface configuration.
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# Copyright (C) 2006 by the Shorewall Team
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# See the file README.txt for further details.
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#
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#
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# /etc/shorewall/masq
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#
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# Use this file to define dynamic NAT (Masquerading) and to define
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# Source NAT (SNAT).
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#
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# WARNING: The entries in this file are order-sensitive. The first
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# entry that matches a particular connection will be the one that
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# is used.
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#
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# WARNING: If you have more than one ISP, adding entries to this
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# file will *not* force connections to go out through a particular
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# ISP. You must use PREROUTING entries in /etc/shorewall/tcrules
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# to do that.
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#
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# Columns are:
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#
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# INTERFACE -- Outgoing interface. This is usually your internet
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# interface. If ADD_SNAT_ALIASES=Yes in
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# /etc/shorewall/shorewall.conf, you may add ":" and
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# a digit to indicate that you want the alias added with
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# that name (e.g., eth0:0). This will allow the alias to
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# be displayed with ifconfig. THAT IS THE ONLY USE FOR
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# THE ALIAS NAME AND IT MAY NOT APPEAR IN ANY OTHER
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# PLACE IN YOUR SHOREWALL CONFIGURATION.
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#
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# This may be qualified by adding the character
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# ":" followed by a destination host or subnet.
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#
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# If you wish to inhibit the action of ADD_SNAT_ALIASES
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# for this entry then include the ":" but omit the digit:
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#
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# eth0:
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# eth2::192.0.2.32/27
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#
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# Normally Masq/SNAT rules are evaluated after those for
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# one-to-one NAT (/etc/shorewall/nat file). If you want
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# the rule to be applied before one-to-one NAT rules,
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# prefix the interface name with "+":
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#
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# +eth0
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# +eth0:192.0.2.32/27
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# +eth0:2
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#
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# This feature should only be required if you need to
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# insert rules in this file that preempt entries in
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# /etc/shorewall/nat.
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#
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# SUBNET -- Subnet that you wish to masquerade. You can specify this as
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# a subnet or as an interface. If you give the name of an
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# interface, the interface must be up before you start the
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# firewall (Shorewall will use your main routing table to
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# determine the appropriate subnet(s) to masquerade).
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#
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# In order to exclude a subset of the specified SUBNET, you
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# may append "!" and a comma-separated list of IP addresses
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# and/or subnets that you wish to exclude.
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#
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# Example: eth1!192.168.1.4,192.168.32.0/27
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#
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# In that example traffic from eth1 would be masqueraded unless
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# it came from 192.168.1.4 or 196.168.32.0/27
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#
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# ADDRESS -- (Optional). If you specify an address here, SNAT will be
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# used and this will be the source address. If
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# ADD_SNAT_ALIASES is set to Yes or yes in
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# /etc/shorewall/shorewall.conf then Shorewall
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# will automatically add this address to the
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# INTERFACE named in the first column.
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#
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# You may also specify a range of up to 256
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# IP addresses if you want the SNAT address to
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# be assigned from that range in a round-robin
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# range by connection. The range is specified by
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# <first ip in range>-<last ip in range>.
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#
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# Example: 206.124.146.177-206.124.146.180
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#
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# Finally, you may also specify a comma-separated
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# list of ranges and/or addresses in this column.
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#
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# This column may not contain DNS Names.
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#
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# Normally, Netfilter will attempt to retain
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# the source port number. You may cause
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# netfilter to remap the source port by following
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# an address or range (if any) by ":" and
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# a port range with the format <low port>-
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# <high port>. If this is done, you must
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# specify "tcp" or "udp" in the PROTO column.
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#
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# Examples:
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#
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# 192.0.2.4:5000-6000
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# :4000-5000
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#
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# You can invoke the SAME target using the
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# following in this column:
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#
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# SAME:[nodst:]<address-range>[,<address-range>...]
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#
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# The <address-ranges> may be single addresses.
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#
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# SAME works like SNAT with the exception that
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# the same local IP address is assigned to each
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# connection from a local address to a given
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# remote address.
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#
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# If the 'nodst:' option is included, then the
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# same source address is used for a given
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# internal system regardless of which remote
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# system is involved.
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#
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# If you want to leave this column empty
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# but you need to specify the next column then
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# place a hyphen ("-") here.
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#
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# PROTO -- (Optional) If you wish to restrict this entry to a
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# particular protocol then enter the protocol
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# name (from /etc/protocols) or number here.
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#
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# PORT(S) -- (Optional) If the PROTO column specifies TCP (protocol 6)
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# or UDP (protocol 17) then you may list one
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# or more port numbers (or names from
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# /etc/services) separated by commas or you
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# may list a single port range
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# (<low port>:<high port>).
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#
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# Where a comma-separated list is given, your
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# kernel and iptables must have multiport match
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# support and a maximum of 15 ports may be
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# listed.
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#
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# IPSEC -- (Optional) If you specify a value other than "-" in this
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# column, you must be running kernel 2.6 and
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# your kernel and iptables must include policy
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# match support.
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#
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# Comma-separated list of options from the
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# following. Only packets that will be encrypted
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# via an SA that matches these options will have
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# their source address changed.
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#
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# Yes or yes -- must be the only option
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# listed and matches all outbound
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# traffic that will be encrypted.
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#
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# reqid=<number> where <number> is
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# specified using setkey(8) using the
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# 'unique:<number> option for the SPD
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# level.
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#
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# spi=<number> where <number> is the
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# SPI of the SA.
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#
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# proto=ah|esp|ipcomp
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#
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# mode=transport|tunnel
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#
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# tunnel-src=<address>[/<mask>] (only
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# available with mode=tunnel)
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#
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# tunnel-dst=<address>[/<mask>] (only
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# available with mode=tunnel)
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#
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# strict Means that packets must match
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# all rules.
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#
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# next Separates rules; can only be
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# used with strict..
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#
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# Example 1:
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#
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# You have a simple masquerading setup where eth0 connects to
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# a DSL or cable modem and eth1 connects to your local network
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# with subnet 192.168.0.0/24.
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#
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# Your entry in the file can be either:
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#
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# eth0 eth1
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#
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# or
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#
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# eth0 192.168.0.0/24
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#
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# Example 2:
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#
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# You add a router to your local network to connect subnet
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# 192.168.1.0/24 which you also want to masquerade. You then
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# add a second entry for eth0 to this file:
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#
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# eth0 192.168.1.0/24
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#
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# Example 3:
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#
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# You have an IPSEC tunnel through ipsec0 and you want to
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# masquerade packets coming from 192.168.1.0/24 but only if
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# these packets are destined for hosts in 10.1.1.0/24:
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#
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# ipsec0:10.1.1.0/24 196.168.1.0/24
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#
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# Example 4:
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#
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# You want all outgoing traffic from 192.168.1.0/24 through
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# eth0 to use source address 206.124.146.176 which is NOT the
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# primary address of eth0. You want 206.124.146.176 added to
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# be added to eth0 with name eth0:0.
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#
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# eth0:0 192.168.1.0/24 206.124.146.176
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#
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# Example 5:
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#
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# You want all outgoing SMTP traffic entering the firewall
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# on eth1 to be sent from eth0 with source IP address
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# 206.124.146.177. You want all other outgoing traffic
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# from eth1 to be sent from eth0 with source IP address
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# 206.124.146.176.
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#
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# eth0 eth1 206.124.146.177 tcp smtp
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# eth0 eth1 206.124.146.176
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#
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# THE ORDER OF THE ABOVE TWO RULES IS SIGNIFICANT!!!!!
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#
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# For additional information, see http://shorewall.net/Documentation.htm#Masq
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#
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##############################################################################
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#INTERFACE SUBNET ADDRESS PROTO PORT(S) IPSEC
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eth0 eth1
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eth0 eth2
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
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