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Chapter 11 - Nat Pat

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Chapter 11 - Nat Pat

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Chapter 11 - Nat Pat

  1. 1. Scaling Networks with NAT and PAT TS, PHẠM VĂN TÍNH <ul><li>Scaling IP Addresses </li></ul>
  2. 2. <ul><li>Objective </li></ul><ul><li>Identify private IP addresses as described in RFC 1918 </li></ul><ul><li>Discuss characteristics of NAT and PAT </li></ul><ul><li>Explain the benefits of NAT </li></ul><ul><li>Explain how to configure NAT and PAT, including static translation, dynamic translation, and overloading </li></ul><ul><li>Identify the commands used to verify NAT and PAT configuration </li></ul><ul><li>List the steps used to troubleshoot NAT and PAT configuration </li></ul><ul><li>Discuss the advantages and disadvantages of NAT </li></ul>
  3. 3. <ul><li>Private addresses </li></ul><ul><li>NAT provides great benefits to individual companies and the Internet. </li></ul><ul><li>Before NAT, a host with a private address could not access the Internet. </li></ul><ul><li>Using NAT, individual companies can address some or all of their hosts with private addresses and use NAT to provide access the Internet. </li></ul>
  4. 4. <ul><li>Introducing NAT and PAT </li></ul><ul><li>NAT enable networks to use private IP addresses on internal networks. These private, internal addresses are translated to routable, public addresses . </li></ul><ul><li>A NAT enabled device typically operates at the border of a stub network . A stub network is a network that has a single connection to its neighbor network </li></ul><ul><li>Cisco defines the following NAT terms: </li></ul><ul><ul><li>Inside local address – The IP address assigned to a host on the inside network. This address is likely to be an RFC 1918 private address. </li></ul></ul><ul><ul><li>Inside global address – A legitimate IP address assigned by the NIC or service provider (public address). </li></ul></ul><ul><ul><li>Outside local address – The IP address of an outside host as it is known to the hosts on the inside network. </li></ul></ul><ul><ul><li>Outside global address – The IP address assigned to a host on the outside network. The owner of the host assigns this address. </li></ul></ul>
  5. 5. <ul><li>Major NAT and PAT features </li></ul><ul><li>Static NAT is designed to allow one-to-one mapping of local and global addresses. </li></ul><ul><li>Dynamic NAT is designed to map a private IP address to a public address. Any IP address from a pool of public IP addresses is assigned to a network host. </li></ul><ul><li>Overloading, or Port Address Translation (PAT), maps multiple private IP addresses to a single public IP address. Multiple addresses can be mapped to a single address because each private address is tracked by a port number. </li></ul><ul><li>PAT uses unique source port numbers on the inside global IP address to distinguish between translations. </li></ul>
  6. 6. <ul><li>Configuring Static NAT </li></ul>Router( config )# ip nat inside source static local-ip global-ip Router( config-if )#ip nat inside Router( config-if )# ip nat outside
  7. 7. <ul><li>Configuring Static NAT </li></ul>
  8. 8. <ul><li>Configuring Dynamic NAT </li></ul>
  9. 9. <ul><li>Configuring PAT </li></ul>
  10. 10. <ul><li>Configuring PAT </li></ul>
  11. 11. <ul><li>Verifying NAT and PAT configuration </li></ul>
  12. 12. <ul><li>Verifying NAT and PAT configuration </li></ul>
  13. 13. <ul><li>Troubleshooting NAT and PAT configuration </li></ul>

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