qr code c# tutorial 23: Address Translation in Objective-C

Printer QR Code 2d barcode in Objective-C 23: Address Translation

23: Address Translation
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12 View the translation table on the 2600-1 router At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1 Examine the translation table: show ip nat translation You should have two sets of translations for ICMP for ICMP, each echo is treated as a separate connection since the IOS is using the sequence numbers in the ICMP payload to differentiate the connections Now you should be more comfortable with configuring dynamic address translation on a router
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INSIDE THE EXAM
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Understand from where companies commonly get their public IP addresses: ISPs and registration authorities (IANA, for example) Remember the ranges of addresses specified in RFC 1918, why private addresses are used, and their shortcomings Be familiar with the reasons address translation is necessary
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I cannot begin to stress how important it is to know the commands for configuring address translation: static, dynamic NAT, and overloading Don t be surprised if you are asked to configure address translation in a simulation question on the exam
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Be able to compare and contrast the definitions in Tables 23-2 and 23-3: for example, the difference between an inside and outside global address Understand how dynamic NAT and overloading (use of source TCP/UDP port numbers) works for inside translations and why overloading is necessary in certain situations Know when PAR is necessary: when you have a single IP address from the ISP, but need Internet users to access internal resources Be familiar with the advantages and disadvantages of address translation
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Again, be very comfortable with the syntax of the address translation commands You might be given configuration scenarios and asked questions about them: for example, given a certain group of users, what will happen to their traffic when it is sent to the Internet Or why isn t address translation occurring given a particular configuration Be familiar with the troubleshooting commands, including the use of the show and debug commands
Certi cation Summary
CERTIFICATION SUMMARY
Private addresses are defined in RFC 1918: 10000/8, 1721600/16 1723100/16, and 19216800/24 1921682550/24 If you use private addresses, you must have these translated to a public address before these packets reach a public network Address translation is used when you don t have enough public addresses, you change ISPs but keep your existing addresses, you are merging companies with overlapping address spaces, or you want to assign the same IP address to multiple machines The term inside local IP address refers to packets with a private or original IP address The term inside global IP address refers to packets with a public, or translated, address NAT translates one IP address to another, while PAT (address overloading) translates many IP addresses to the same global address, where the source port numbers are changed to ensure the translation device can differentiate the connections PAR redirects traffic destined to a port on one device to a different device Address translation allows access to an almost inexhaustible group of addresses and enables you to hide your internal network design from outsiders It also gives you tighter control over traffic entering and leaving your network However, address translation adds delay to your traffic, makes troubleshooting more difficult, and won t work with all applications, especially multimedia applications The ip nat inside source static command sets up static NAT The ip nat inside source list and ip nat pool (add overload to do PAT) commands set up dynamic translations The ip nat inside|outside Interface Subconfiguration mode command defines which interfaces are considered internal and external for address translation Use the show ip nat translations command to view the router s address translation table The clear ip nat translation * command clears all dynamic address translation entries in the router s translation table The debug ip nat command will show the translations the IOS is doing on every translated packet
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