3D Connexion 17621 setup guide Pinging the NAT Router Condition, Example TWO

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allows the NAT Router to make the NAT Web server appear to be at 198.41.9.194. This NAT Map Database entry allows the NAT software to create a NAT Session when the site at 128.138.240.11 initiates an IP session to the NAT External Range IP address:port combination of 198.41.9.195:80. Remember that the NAT software cannot establish a NAT Session initiated by a source on the External Network/Internet unless such a "one−to−one" translation pair is defined in the NAT Map Database.

The NAT software will now translate packets from the Internet with the destination IP address:TCP port combination of 198.41.9.195:80 to the destination of 10.5.3.11:80. The NAT software will translate packets from the NAT Web server with a source of 10.5.3.11:80 to a source of 198.41.9.195:80 before routing them out of the External NAT Port.

PINGING THE NAT ROUTER (CONDITION 2)

This is a relatively simple situation. A source on the Internet sends an ICMP Echo Request Packet to IP address 198.41.9.195 (the IP address of Ethernet 0 on the NAT Router). The NAT Router does not do a Network Address Translation on the packet. The destination address is not in the NAT External Range of 198.41.9.194, 198.41.9.195 or 198.41.9.219. It is accepted by the NAT Router for processing. The NAT Router generates an ICMP Echo Reply packet and transmits it out Ethernet 0 to the source IP address from the ICMP Echo Request packet.

EXAMPLE TWO

This example demonstrates the functionality of the PassThru Range of Compatible Systems NAT software.

Example Two uses one Compatible Systems MicroRouter 2220R router to connect to the Internet through WAN 0 (the External NAT Port), to the NAT Network, with "private" IP addresses, through Ethernet 1 (the Internal NAT Port), and to part of the user's Network, which has "global" IP addresses, through Ethernet 0.

The part of the user's network connected to NAT Router Ethernet 0 is really part of the Internet. The External NAT Interface of WAN 0 connects to the WAN 0 of another router and to the Internet. This second router, even though it is shown in Figure 2, is not important to this example, except for the fact that it routes packets with addresses in the NAT PassThru Range to the WAN 0 External NAT Port of the NAT Router.

Figure 2

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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 Concluding Explanation Remarks Console Commands for the NAT Software Show NATShow NAT Config 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 Currently Supported IP Applications NAT Passthru RANGE, ExampleFinal Notes Updated Aug 19 Document ID

17621 specifications

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