DHCP

DHCP

1. DHCPV4

   • DHCPV4 OPERATION
     • Introducing DHCPv4
       • DHCPv4 assigns IPv4 addresses and other network configuration information dynamically. Because desktop clients typically make up the bulk of network nodes, DHCPv4 is an extremely useful and timesaving tool for network administrators.
     • DHCPv4 Operation
     • DHCPv4 Message Format
     • DHCPv4 Discover and Offer Messages
       • If a client is configured to receive its IPv4 settings dynamically and wants to join the network, it requests addressing values from the DHCPv4 server.
   • CONFIGURING DHCPV4 SERVER
     • Configuring a Basic DHCPv4 Server
       • Step 1. Excluding IPv4 Addresses.Step 2. Configuring a DHCPv4 Pool. Step 3. Configuring Specific Tasks
     • Verifying DHCPv4
     • DHCPv4 Relay
       • What is DHCP Relay? In a complex hierarchical network, enterprise servers are usually located in a server farm. These servers may provide DHCP, DNS, TFTP, and FTP services for the network.
   • CONFIGURE DHCPV4 CLIENT
     • Configuring a Router as DHCPv4 Client
       • Sometimes, Cisco routers in small office/home office (SOHO) and branch sites have to be configured as DHCPv4 clients in a similar manner to client computers. The method used depends on the ISP. However, in its simplest configuration, the Ethernet interface is used to connect to a cable or DSL modem.
     • Configuring a Wireless Router as a DHCPv4 Client
       • Typically, wireless routers for home or small office use connect to an ISP using a DSL or cable modem. In most cases, wireless routers are set to receive IPv4 addressing information automatically from the ISP
   • TROUBLESHOOT DHCPV4
     • Troubleshooting Tasks
     • Verify Router DHCPv4 Configuration
     • Debugging DHCPv4
       • On routers configured as DHCPv4 servers, the DHCPv4 process fails if the router is not receiving requests from the client. As a troubleshooting task, verify that the router is receiving the DHCPv4 request from the client. This troubleshooting step involves configuring an ACL for debugging output.

2. DHCPV6

   • SLAAC AND DCHPV6
     • Stateless Address Autoconfiguration (SLAAC)
     • SLAAC Operation
     • SLAAC and DHCPv6
     • SLAAC Option
     • Stateless DHCPv6 Option
     • Stateful DHCPv6 Option
     • DHCPv6 Operations
       • As shown in Figure 1, stateless or stateful DHCPv6, or both begin with an ICMPv6 RA message from the router. The RA message might have been a periodic message or solicited by the device using an RS message.
   • STATELESS DHCPV6
     • Configuring a Router as a Stateless DHCPv6 Server
     • Configuring a Router as a Stateless DHCPv6 Client
     • Verifying Stateless DHCPv6
       • Verifying the Stateless DHCPv6 Server In Figure 1, the show ipv6 dhcp pool command verifies the name of the DHCPv6 pool and its parameters. The number of active clients is 0, because there is no state being maintained by the server.
   • STATEFULL DHCPV6 SERVER
     • Configuring a Router as a Stateful DHCPv6 Server
     • Configuring a Router as a Stateful DHCPv6 Client
       • As shown in the figure, use the ipv6 enable interface configuration mode command to allow the router to receive a link-local address to send RS messages and participate in DHCPv6.
     • Verifying Stateful DHCPv6
       • Verifying the Stateful DHCPv6 Server, erifying the Stateful DHCPv6 Client
     • Configuring a Router as a DHCPv6 Relay Agent
       • If the DHCPv6 server is located on a different network than the client, then the IPv6 router can be configured as a DHCPv6 relay agent. The configuration of a DHCPv6 relay agent is similar to the configuration of an IPv4 router as a DHCPv4 relay.
   • TROUBLESHOOT DHCPV6
     • Troubleshooting Tasks
     • Verify Router DHCPv6 Configuration
       • Stateful DHCPv6, Stateless DHCPv6
     • Debugging DHCPv6
       • When the router is configured as a stateless or stateful DHCPv6 server, the debug ipv6 dhcp detail command is useful to verify the receipt and transmission of DHCPv6 messages.

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