DHCP is used to assign IP addresses to computers joining a network. Many ISPs use DHCP to give their customers IP addresses. When DHCP assigns you an IP address, or sends you a "DHCP certificate," it "leases" the IP address to you for a period of time. When this lease runs out, the DHCP certificate becomes "stale," and you must request a new one. Usually your computer will do this automatically and you won't even know it happened. This terminology is a bit strange. I can guess what you mean by a "stale" DHCP "certificate" but I'm not sure that everyone would. It sounds like something that someone made up. I could be wrong. -DJ Craig
The port 67 and port 68 are used by DHCP and the DHCP clients.
dhcp has to be authorized
The use of a DHCP relay agent is an agent that relays DHCP between DHCP clients and DHCP servers on different IP networks. The DHCP relay agent is compliant with RFC 1542.
router (config)# ip dhcp servicerouter (dhcp-config)# ip dhcp pool router (dhcp-config)# network
(DHCP) Dynamic host Configuration Protocol. The Default Port Number is: for DHCP client : 546 for DHCP server : 547
yes DHCP require the authorization of the dhcp server before IP addresses can be allocated because until we authorize DHCP server the network does not know who is the dhcp server for the subnet. The DHCP server broadcasts the information to all.
Those are the four phases of acquiring an IP address via DHCP. More information would be needed to indicate which of the 4 phases are being used at this point.
dhcp-client
DHCP server configuration in /etc/dhcp/dhcpd.conf(FEDORA)or /etc/dhcpd.conf (RHEL).
The homophone for "stale" is "stale," as in when two or more words sound the same but have different meanings.
DHCP Server can be a standalone server
Router is usually configured as a DHCP client for WAN (Internet) network and as a DHCP server for local network.