NAME

       nat - Shorewall6 one-to-one NAT file

SYNOPSIS

       /etc/shorewall6/nat

DESCRIPTION

       This file is used to define one-to-one Network Address Translation (NAT).

           Warning

           If all you want to do is simple port forwarding, do NOT use this file. See
           http://www.shorewall.net/FAQ.htm#faq1[1].

       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).

       EXTERNAL - {address|?COMMENT}
           External IP Address - this should NOT be the primary IP address of the interface named in the next
           column and must not be a DNS Name.

           If you put ?COMMENT in this column, the rest of the line will be attached as a comment to the
           Netfilter rule(s) generated by the following entries in the file. The comment will appear delimited
           by "/* ... */" in the output of "shorewall show nat"

           To stop the comment from being attached to further rules, simply include ?COMMENT on a line by
           itself.

       INTERFACE - interfacelist[:[digit]]
           Interfaces that have the EXTERNAL address. If ADD_IP_ALIASES=Yes in shorewall6.conf[2](5), Shorewall
           will automatically add the EXTERNAL address to this interface. Also if ADD_IP_ALIASES=Yes, you may
           follow the interface name with ":" and a digit to indicate that you want Shorewall to add the alias
           with this name (e.g., "eth0:0"). That allows you to see the alias with ifconfig.  That is the only
           thing that this name is good for -- you cannot use it anywhere else in your Shorewall configuration.

           Each interface must match an entry in shorewall6-interfaces[3](5). Shorewall allows loose matches to
           wildcard entries in shorewall6-interfaces[4](5). For example, ppp0 in this file will match a
           shorewall6-interfaces[3](5) entry that defines ppp+.

           If you want to override ADD_IP_ALIASES=Yes for a particular entry, follow the interface name with ":"
           and no digit (e.g., "eth0:").

       INTERNAL - address
           Internal Address (must not be a DNS Name).

       ALLINTS - [Yes|No]
           If Yes or yes, NAT will be effective from all hosts. If No or no (or left empty) then NAT will be
           effective only through the interface named in the INTERFACE column.

           This column was formerly labelled ALL INTERFACES.

       LOCAL - [Yes|No]
           If Yes or yes, NAT will be effective from the firewall system

FILES

       /etc/shorewall6/nat

SEE ALSO

       http://www.shorewall.net/NAT.htm[5]

       http://www.shorewall.net/configuration_file_basics.htm#Pairs[6]

NOTES

        1. http://www.shorewall.net/FAQ.htm#faq1
           http://www.shorewall.net/FAQ.htm#faq1

        2. shorewall6.conf
           http://www.shorewall.net/manpages/shorewall.conf.html

        3. shorewall6-interfaces
           http://www.shorewall.net/manpages/shorewall6-interfaces.html

        4. shorewall6-interfaces
           http://www.shorewall.net/manpages/shorewall-interfaces.html

        5. http://www.shorewall.net/NAT.htm
           http://www.shorewall.net/NAT.htm

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

Configuration Files                                01/21/2016                                  SHOREWALL6-NAT(5)