DHCP gives every host an IP, mask, gateway, and DNS without anyone touching the keyboard. This chapter walks through the DORA exchange, configures a router as a DHCP server, and explains the ip helper-address relay.
All four are sent inside UDP. The client's source IP is 0.0.0.0 until the lease is granted; broadcast destination 255.255.255.255 is used for Discover and Request.
R1(config)# ip dhcp excluded-address 10.0.10.1 10.0.10.10
R1(config)# ip dhcp pool LAN10
R1(dhcp-config)# network 10.0.10.0 /24
R1(dhcp-config)# default-router 10.0.10.1
R1(dhcp-config)# dns-server 8.8.8.8 1.1.1.1
R1(dhcp-config)# lease 7
R1(dhcp-config)# end
R1# show ip dhcp pool
R1# show ip dhcp binding2 more sections in this chapter, plus a 2-question quiz and a hands-on lab.
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