natutil(8) [osx man page]

natutil(8)						    BSD System Manager's Manual 						natutil(8)

NAME

     natutil -- Query and configure supported Network Address Translation (NAT) devices

SYNOPSIS

     natutil [-vx] [-a auth] [-n name] {-1 | -d | -m | -s | -i | -L}

     natutil [-vx] [-a auth] [-n name] {-t | -u} {-T | -U} -p ports

DESCRIPTION

     natutil uses the ACP protocol to detect, configure, and extract status information from Internet gateway devices (IGDs) (such as AirPort Base
     Stations) on the local network. Since most IGDs provide Network Address Translation (NAT) service, they are often interchangably referred to
     as "NAT devices" or simply "NATs".

     The first synopsis line (with the exception of -L) returns various information from NAT devices.

     The second invocation modifies settings on the device. After modifying settings, AirPort Base Stations must be rebooted for the changes to
     take effect. ( servermgrd(8) also reboots the AirPort Base Station when it modifies port mappings.)

OPTIONS

     The following options / commands are available:

     -1       Only return data if the IGD found is also our current gateway.  [AirPort only] Will only return if this base station can be autocon-
	      figured

     -a auth  [AirPort only] The authentication string to use when communicating with a device protected with a password other than the default
	      "public". Used mostly for scripted operation. Use -i to get the authentication string interactively.

     -i       Get the authentication string interactively. This preferred over -a for security reasons.

     -d       Reports the IGDs (Internet Gateway Devices) that were found during the discovery.

     -m       Retrieves the port mapping table from the NAT.

     -n name  The prefix of the targeted NAT device's name (useful in a LAN with multiple NAT devices).

     -p ports
	      A comma-separated list of the ports to tap or untap. Must be used with -t or -u.

     -s       Retrieves the WAN & LAN status and configuration from the IGD.

     -t       Configures the NAT to forward the given ports to this machine. Requires -p and either -T or -U.

     -u       Removes the given ports from the NAT's port forwarding rules. Requires -p and either -T or -U.

     -v       Verbose output. Provides progress and status information on standard output.

     -x       XML output. This option provides the most information.

     -L       [AirPort only] Convert existing DHCP lease into a static reservation so the host will receive the same IP address after each reboot.

     -T       Ports will be tapped / untapped for the TCP protocol. Must be used with -t or -u.

     -U       Ports will be tapped / untapped for the UDP protocol. Must be used with -t or -u.

SEE ALSO

     ifconfig(8), ipconfig(8)

Mac OS X Server 10.5						   July 23, 2007					      Mac OS X Server 10.5

Check Out this Related Man Page

NAT action in tc(8)						       Linux						       NAT action in tc(8)

NAME

       nat - stateless native address translation action

SYNOPSIS

       tc ... action nat DIRECTION OLD NEW

       DIRECTION := { ingress | egress }

       OLD := IPV4_ADDR_SPEC

       NEW := IPV4_ADDR_SPEC

       IPV4_ADDR_SPEC := { default | any | all | in_addr[/{prefix|netmask}]

DESCRIPTION

       The  nat  action allows to perform NAT without the overhead of conntrack, which is desirable if the number of flows or addresses to perform
       NAT on is large. This action is best used in combination with the u32 filter to allow for efficient lookups of a large number of  stateless
       NAT rules in constant time.

OPTIONS

       ingress
	      Translate destination addresses, i.e. perform DNAT.

       egress Translate source addresses, i.e. perform SNAT.

       OLD    Specifies addresses which should be translated.

       NEW    Specifies addresses which OLD should be translated into.

NOTES

       The  accepted address format in OLD and NEW is quite flexible. It may either consist of one of the keywords default, any or all, represent-
       ing the all-zero IP address or a combination of IP address and netmask or prefix length separated by a slash (/) sign.  In  any	case,  the
       mask (or prefix length) value of OLD is used for NEW as well so that a one-to-one mapping of addresses is assured.

       Address	translation  is  done  using  a  combination  of binary operations. First, the original (source or destination) address is matched
       against the value of OLD.  If the original address fits, the new address is created by taking the leading bits from  NEW  (defined  by  the
       netmask of OLD) and taking the remaining bits from the original address.

       There  is  rudimental  support for upper layer protocols, namely TCP, UDP and ICMP.  While for the first two only checksum recalculation is
       performed, the action also takes care of embedded IP headers in ICMP packets by translating the respective address therein, too.

SEE ALSO

       tc(8)

iproute2							    12 Jan 2015 					       NAT action in tc(8)

Linux and UNIX Man Pages

natutil(8) [osx man page]

Check Out this Related Man Page