Ethernet 0 is the External NAT Port, Ethernet 1 is the Internal NAT Port. The IP protocol on the Bridge, Wan 0, and Wan 1 has been disabled in this example.

Note: Again, the NAT software is currently designed and has only been tested with one External IP Port on a router. In the latest releases of Compatible Systems device software (versions 4.3 and later), the display in response to the show ip config will display which IP interface has the variable NatMap enabled (NatMap = On).

The configuration setup of each IP Ethernet Port is shown below with the corresponding keywords from the [NAT Global] section. The "agreement" between the keywords of these sections is also shown.

EXTERNAL NAT PORT, EXAMPLE 1

The configuration of the External NAT Port and its relation to the [NAT Global] section is shown first.

Nat_2220> config ip ethernet 0

Enter Password:

Configure parameters in this section by entering:

<Keyword> = <Value>

To find a list of valid keywords and additional help enter "?"

[ IP Ethernet 0 ] # list

 

[ IP Ethernet 0 ]

 

Mode

= Routed

RIPVersion

= V2

NatMap

= On

SubnetMask

= 255.255.255.224

IPAddress

= 198.41.9.195

The most important keyword here is NatMap. If this keyword is not set to On, the IP Port will not perform Network Address Translation.

Note: The NatMap keyword needs to be turned On only on the External NAT Port. NatMap should not be set to On for the Internal Nat Port.

The other two IP port keywords that are critical for proper NAT performance are IPAddress and SubnetMask. The user must have the External NAT Port, and the network to which it is connected, configured such that IP packets with addresses within the NAT External Range enter the router through the NAT External Port.

In [NAT Global]:

Entered External range(s):

198.41.9.219

 

198.41.9.195

 

198.41.9.194

and in [ IP Ethernet 0 ]:

SubnetMask

=

255.255.255.224

IPAddress

=

198.41.9.195

The IP port must also have its Mode set to Routed.

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3D Connexion 17621 setup guide External NAT PORT, Example

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