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