Dynamic Host Configuration Protocol (DHCP)

The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on UDP/IP networks whereby a DHCP server dynamically assigns an IP address and other network configuration parameters to each device/computer on a network.

• Static vs dynamic IP addressing
• Reservations
• Scopes
• Leases: show ip dhcp binding
• Options (DNS servers, suffixes)
• IP helper/DHCP relay

Available DHCP Servers:

• ISC-DHCP (DHCP) Configuration
• Cisco IOS dhcp server
• dhcpcd

dhclient -r INTERFACE
dhclient -r INTERFACE -v (verbose)

Related files:

• /etc/dhcp/dhclient.conf

dhcpcd

• /etc/dhcpcd.conf

Activities

• Renew DHCP address in your macOS from command line
• Configure a DHCP server for your network using isc-dhcp-server package
• Cisco IOS DHCP Server configuration
• show running-config dhcp

See also

• Cisco IOS
• DHCP: Cisco IOS DHCP Server, isc-dhcp-server (dhcpd.conf), ip dhcp pool show ip dhcp pool, show ip dhcp binding, show ip dhcp conflict, show ip dhcp server statistics, DHCP snooping, client-identifier, hardware-address, show ip dhcp, ip link, dhcpcd, AWS::EC2::DHCPOptions, dhclient, systemd-networkd
• KVM: virsh net-dhcp-leases