3D Connexion 17621 setup guide IP Section ID Port Configuration for NAT for Example ONE

Nat_2220> sh nat map

[ NAT Map Database ]

Total Number of Entries in NAT Map Database: 2

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

InternalExternal

LineNo. <IPaddress[/Mask or :Port]> −> <IPaddress[/Mask or :Port]>

1	−>
2	−>

Important points about the one−to−one translation pairs in the NAT Map Database:

1.The Internal IP Address must be entered first, followed by "−>" or " = ", followed by the External IP Address.

2.The Internal IP Address must be within the range of IP addresses defined by the [NAT Global] keyword InternalRange, and the External IP Address must be within the range of IP addresses defined by the [NAT Global] keyword ExternalRange.

3.The one−to−one pairs must either be both IP address:port combinations, or IP address ranges. An IP address:port combination cannot be paired with an IP address range (even if that range is a single IP address).

4.IF ONLY A SINGLE EXTERNAL IP ADDRESS IS AVALIABLE FOR THE NAT ROUTER, DO NOT MAP THAT IP ADDRESS TO AN INTERNAL IP ADDRESS! YOU WILL NOT BE ABLE TO CONTACT THE ROUTER THROUGH THE EXTERNAL NAT PORT TO COMMUNICATE WITH IT! Mapping single ports of the single external IP address to internal IP address:port combinations is acceptable, such as creating access to a Web server in the NAT Network (see Example One).

Mapping the entire single external IP address (the router's IP Address) to an internal NAT address will prevent you from communicating with the router when NAT functionality is enabled.

Note: The [NAT Global] variable RouterAddr must also be set to On (the current default value) to allow the user to communicate with the NAT Router via IP over any of its IP ports.

[ IP < Section ID > ] PORT CONFIGURATION FOR NAT FOR EXAMPLE ONE

The IP ports on a Compatible Systems router performing Network Address Translation must be configured to be "in agreement" with the configuration of the [NAT Global] keywords or the router will not do Network Address Translation between the NAT Network and the External Network/Internet.

The configuration of the Example One Compatible Systems MicroRouter 2220R Router is shown below. The slightly more complex configuration of the NAT Router in Example Three is shown at the end of this section.

Nat_2220> show ip config
		Addresses
Port	IP Addr	Subnet	Broadcast	Flags
Ethernet 0	198.41.9.195	255.255.255.224	198.41.9.223	<OSPF:off><RIP:out, in, V2>
				<NAT>
Ethernet 1	10.5.3.1	255.255.255.224	10.5.3.31	<OSPF:off><RIP:out, in, V2>
Bridge	** Disabled **
Wan 0	** Disabled **
Wan 1	** Disabled **