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Implementing IP Addressing Services

Implementing IP Addressing Services. Accessing the WAN – Chapter 7. Objectives. Configure DHCP in an enterprise branch network Configure NAT on a Cisco router. Function of DHCP. To allocate IP addresses, mask, gateway to devices that are not always on, or that move.

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Implementing IP Addressing Services

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  1. Implementing IP Addressing Services Accessing the WAN– Chapter 7

  2. Objectives Configure DHCP in an enterprise branch network Configure NAT on a Cisco router

  3. Function of DHCP To allocate IP addresses, mask, gateway to devices that are not always on, or that move

  4. Configure DHCP in an Enterprise Branch Network DHCP provides a device with several important pieces of information The device's IP address The netmask for the network The IP address of the default gateway The IP addresses of the local DNS servers The domain name and port for the local web proxy server Some of these things are optional In fact, DHCP can provide a lot of optional networking information to clients as they are booting

  5. Process to Obtain DHCP Information Four-step process (DORA)

  6. Configure DHCP in an Enterprise Branch Network We can configure a router to act as a DHCP server It needs to know: what addresses are in the pool of available addresses, what addresses are excluded, and what other optional information to advertise Setting up the excluded addresses

  7. Configure DHCP in an Enterprise Branch Network Setting up the pool of available IP addresses

  8. Configure DHCP in an Enterprise Branch Network The rest of the configuration

  9. Verifying DHCP Operation

  10. Troubleshooting DHCP Operation

  11. Private IP Addresses Not routed across the Internet

  12. NAT: Network Address Translation NAT allows a network using private IP addresses to be hidden behind a device with one or more public IP addresses The device modifies the addresses in each packet so that the private addresses are not seen on the Internet

  13. Advantages and Disadvantages of NAT

  14. Three Types of NAT Static NAT: one private IP tied to one public IP Dynamic IP: pool of public IPs. As a private IP device needs to communicate on the Internet, a mapping is made to one of the public IPs in the pool NAT Overload (or Port Address Translation) Only one or a few public IPs, but many private IPs We rewrite source port numbers as well as private IP addresses, so that the intenal devices can share the public IP addresses

  15. Configuring Static NAT This also allows connections from the Internet into the private device

  16. Configuring Dynamic NAT Public IPs are not shared between devices Connections cannot come in from the Internet

  17. Configuring NAT Overload Ports are used to share the one (few) IP addresses

  18. Verifying NAT

  19. Verifying NAT

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