1SHOREWALL-NAT(5)                [FIXME: manual]               SHOREWALL-NAT(5)
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NAME

6       nat - Shorewall one-to-one NAT file
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SYNOPSIS

9       /etc/shorewall/nat
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DESCRIPTION

12       This file is used to define one-to-one Network Address Translation
13       (NAT).
14
15           Warning
16           If all you want to do is simple port forwarding, do NOT use this
17           file. See http://www.shorewall.net/FAQ.htm#faq1[1]. Also, in many
18           cases, Proxy ARP (shorewall-proxyarp[2](5)) is a better solution
19           that one-to-one NAT.
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21       The columns in the file are as follows.
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23       EXTERNAL - {address|COMMENT}
24           External IP Address - this should NOT be the primary IP address of
25           the interface named in the next column and must not be a DNS Name.
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27           If you put COMMENT in this column, the rest of the line will be
28           attached as a comment to the Netfilter rule(s) generated by the
29           following entries in the file. The comment will appear delimited by
30           "/* ... */" in the output of "shorewall show nat"
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32           To stop the comment from being attached to further rules, simply
33           include COMMENT on a line by itself.
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35       INTERFACE - interfacelist[:[digit]]
36           Interfaces that have the EXTERNAL address. If ADD_IP_ALIASES=Yes in
37           shorewall.conf[3](5), Shorewall will automatically add the EXTERNAL
38           address to this interface. Also if ADD_IP_ALIASES=Yes, you may
39           follow the interface name with ":" and a digit to indicate that you
40           want Shorewall to add the alias with this name (e.g., "eth0:0").
41           That allows you to see the alias with ifconfig.  That is the only
42           thing that this name is good for -- you cannot use it anwhere else
43           in your Shorewall configuration.
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45           Each interface must match an entry in shorewall-interfaces[4](5).
46           Shorewall allows loose matches to wildcard entries in
47           shorewall-interfaces[4](5). For example, ppp0 in this file will
48           match a shorewall-interfaces[4](5) entry that defines ppp+.
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50           If you want to override ADD_IP_ALIASES=Yes for a particular entry,
51           follow the interface name with ":" and no digit (e.g., "eth0:").
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53       INTERNAL - address
54           Internal Address (must not be a DNS Name).
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56       ALL INTERFACES - [Yes|No]
57           If Yes or yes, NAT will be effective from all hosts. If No or no
58           (or left empty) then NAT will be effective only through the
59           interface named in the INTERFACE column.
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61       LOCAL - [Yes|No]
62           If Yes or yes, NAT will be effective from the firewall system
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FILES

65       /etc/shorewall/nat
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SEE ALSO

68       http://shorewall.net/NAT.htm
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70       shorewall(8), shorewall-accounting(5), shorewall-actions(5),
71       shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5),
72       shorewall-ipsets(5), shorewall-maclist(5), shorewall-masq(5),
73       shorewall-netmap(5), shorewall-params(5), shorewall-policy(5),
74       shorewall-providers(5), shorewall-proxyarp(5),
75       shorewall-route_rules(5), shorewall-routestopped(5),
76       shorewall-rules(5), shorewall.conf(5), shorewall-secmarks(5),
77       shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5),
78       shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)
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NOTES

81        1. http://www.shorewall.net/FAQ.htm#faq1
82           http://www.shorewall.net/manpages/../FAQ.htm#faq1
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84        2. shorewall-proxyarp
85           http://www.shorewall.net/manpages/shorewall-proxyarp.html
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87        3. shorewall.conf
88           http://www.shorewall.net/manpages/shorewall.conf.html
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90        4. shorewall-interfaces
91           http://www.shorewall.net/manpages/shorewall-interfaces.html
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95[FIXME: source]                   09/16/2011                  SHOREWALL-NAT(5)
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