3D Connexion 17621 setup guide Pinging the Macintosh AT 198.41.9.210 Condition, Example Three

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Systems NAT functionality:

1.The NAT External Range in the NAT Router does not have to be directly related to the IP address of the External NAT Port. However, the NAT External Range does have to be a "global" IP address and it must be "routable." The network must be able to deliver IP packets with addresses in the NAT External Range to the External NAT Port.

2.The designation of an IP address as part of the NAT External Range has a higher priority than the designation of that same IP address as part of the NAT PassThru Range in the Compatible Systems sub−interface. Even though the IP address of 198.41.9.214 is included as part of the NAT PassThru Range (198.41.9.195/27), its designation as part of the NAT External Range takes precedence. The IP address

198.41.9.214 will be part of the NAT External Range.

PINGING THE MACINTOSH AT 198.41.9.210 (CONDITION 3)

A site on the Internet sends an ICMP Echo Request packet to the Macintosh at IP address 198.41.9.210. The ICMP packet arrives at the NAT Router WAN 0 IP Interface, the External NAT Port. The IP destination address is within the NAT PassThru Range of 198.41.9.195/27, and is not within the NAT External Range of 198.41.9.214, so the NAT Router does not do any Network Address Translation to the packet. The ICMP packet is transmitted out IP Interface Ethernet 0 to the Macintosh.

The Macintosh replies with an ICMP Echo Reply packet that enters the NAT Router from Ethernet 0. The NAT Router determines that the packet is destined for the External NAT Port with NatMap = On, but the source IP address is within the NAT PassThru Range, and not in the NAT External Range. The router does not translate the source IP address of the packet and simply transmits this ICMP Echo Reply packet out WAN 0 and to the source on the Internet which sent the ICMP Echo Request.

EXAMPLE THREE

This example demonstrates the functionality of the Compatible Systems NAT software to configure the External NAT Port and Internal NAT Port on the same physical port (Ethernet 0 in this example) using sub−interfaces.

Example Three uses one Compatible Systems MicroRouter 2220R Router to connect to the Internet through Ethernet 0 (the External NAT Port), to the NAT Network (with "private" IP addresses) through Ethernet 0.1 (the Internal NAT Port), and to part of the user's Network, which has "global" IP addresses, through Ethernet 0.2. The part of the user's network connected to NAT Router Ethernet 0.2 is really part of the Internet. The External NAT Interface of Ethernet 0 connects to the Internet via another device (not shown) connected to the same Ethernet hub as Ethernet 0.

Figure 3

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Contents Contents − Network Address Translation Configuration Guide Final Notes Important Disclaimers Local Network Security NAT FunctionalityExample ONE AN Example NAT Session Condition Page Condition 1 a NAT Session Initiated from the Outside Pinging the NAT Router Condition Example TWOPage Pinging the Macintosh AT 198.41.9.210 Condition Example ThreePage Show NAT Config Console Commands for the NAT Software Show NATConcluding Explanation Remarks Line−by−line description of this display follows TCP SYN timeout period sec Show NAT MAP Show NAT SessionsShow NAT Statistics Show NAT Addressdb NAT Global Page RespondICMP NAT interface responses to Icmp packets NAT Mapping IP Section ID Port Configuration for NAT for Example ONE External NAT PORT, Example IP Section ID Port Configuration for NAT for Example Three Internal NAT PORT, ExampleHere is the configuration of the IP ports Entered External range Final Notes NAT Passthru RANGE, ExampleCurrently Supported IP Applications Updated Aug 19 Document ID

17621 specifications

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