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shorewall6-netmap(5)

NAME

   netmap - Shorewall6 NETMAP definition file

SYNOPSIS

   /etc/shorewall/netmap

DESCRIPTION

   This file is used to map addresses in one network to corresponding
   addresses in a second network. It was added in Shorewall6 4.4.23.3.

       Warning
       To use this file, your kernel and ip6tables must have RAWPOST table
       support included.

   The columns in the file are as follows (where the column name is
   followed by a different name in parentheses, the different name is used
   in the alternate specification syntax).

   TYPE - {DNAT|SNAT}:{P|O|T}
       Must be DNAT or SNAT followed by :P, :O or :T to perform stateless
       NAT. Stateless NAT requires Rawpost Table support in your kernel
       and iptables (see the output of shorewall6 show capabilities).

       If DNAT:P, traffic entering INTERFACE and addressed to NET1 has its
       destination address rewritten to the corresponding address in NET2.

       If SNAT:T, traffic leaving INTERFACE with a source address in NET1
       has it's source address rewritten to the corresponding address in
       NET2.

       If DNAT:O, traffic originating on the firewall and leaving via
       INTERFACE and addressed to NET1 has its destination address
       rewritten to the corresponding address in NET2.

       If DNAT:P, traffic entering via INTERFACE and addressed to NET1 has
       its destination address rewritten to the corresponding address in
       NET2.

       If SNAT:P, traffic entering via INTERFACE with a destination
       address in NET1 has it's source address rewritten to the
       corresponding address in NET2.

       If SNAT:O, traffic originating on the firewall and leaving via
       INTERFACE with a source address in NET1 has it's source address
       rewritten to the corresponding address in NET2.

   NET1 - network-address
       Network in CIDR format (e.g., 2001:470:b:227/64). Beginning in
       Shorewall6 4.4.24, exclusion[1] is supported.

   INTERFACE - interface
       The name of a network interface. The interface must be defined in
       shorewall6-interfaces[2](5). Shorewall allows loose matches to
       wildcard entries in shorewall6-interfaces[2](5). For example, ppp0
       in this file will match a shorewall6-interfaces[2](5) entry that
       defines ppp+.

   NET2 - network-address
       Network in CIDR format

   NET3 - network-address
       Optional - added in Shorewall 4.4.11. If specified, qualifies
       INTERFACE. It specifies a SOURCE network for DNAT rules and a
       DESTINATION network for SNAT rules.

   PROTO (Optional - protocol-number-or-name
       Only packets specifying this protocol will have their IP header
       modified.

   DPORT - port-number-or-name-list
       Destination Ports. An optional comma-separated list of Port names
       (from services(5)), port numbers or port ranges; if the protocol is
       icmp, this column is interpreted as the destination icmp-type(s).
       ICMP types may be specified as a numeric type, a numeric type and
       code separated by a slash (e.g., 3/4), or a typename. See
       http://www.shorewall.net/configuration_file_basics.htm#ICMP[3].

       If the protocol is ipp2p, this column is interpreted as an ipp2p
       option without the leading "--" (example bit for bit-torrent). If
       no PORT is given, ipp2p is assumed.

       An entry in this field requires that the PROTO column specify icmp
       (1), tcp (6), udp (17), sctp (132) or udplite (136). Use '-' if any
       of the following field is supplied.

       This column was formerly labelled DEST PORT(S).

   SPORT - port-number-or-name-list
       Optional source port(s). If omitted, any source port is acceptable.
       Specified as a comma-separated list of port names, port numbers or
       port ranges.

       An entry in this field requires that the PROTO column specify tcp
       (6), udp (17), sctp (132) or udplite (136). Use '-' if any of the
       following fields is supplied.

       This column was formerly labelled SOURCE PORT(S).

FILES

   /etc/shorewall/netmap

SEE ALSO

   http://www.shorewall.net/netmap.html[4]

   http://www.shorewall.net/configuration_file_basics.htm#Pairs[5]

NOTES

    1. exclusion
       http://www.shorewall.net/manpages6/shorewall6-exclusion.html

    2. shorewall6-interfaces
       http://www.shorewall.net/manpages6/shorewall6-interfaces.html

    3. http://www.shorewall.net/configuration_file_basics.htm#ICMP
       http://www.shorewall.net/configuration_file_basics.htm#ICMP

    4. http://www.shorewall.net/netmap.html
       http://www.shorewall.net/netmap.html

    5. http://www.shorewall.net/configuration_file_basics.htm#Pairs
       http://www.shorewall.net/configuration_file_basics.htm#Pairs



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