DHCP - How it works.

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  • DAG COPIERS & COMPUTERS
    Senior Tech

    500+ Posts
    • Oct 2010
    • 860

    #1

    [Misc] DHCP - How it works.

    Just to 'Refresh our Memory'.

    >When DHCP assigns an IP Address, it actually LEASES the identifier to the host computer or network device, for a specific amount of time. The default lease is five days, although a network administrator can evaluate their own particular circumstances to determine an appropriate lease (time).

    In BASIC terms, the DHCP lease process works as follows:

    1- A network device attempts to connect to the network.
    2- The network requests an IP Address.
    3- The DHCP server allocates (Leases) the network device, an IP Address, which is forwarded to the network by the Router.
    4- DHCP updates the appropriate network servers with the IP address and other configuration information.
    5-The network Device accepts the IP address.
    6- * The IP address lease EXPIRES.
    7- DHCP either reallocates the(same?) IP address or LEASES one that is available.
    8- * The Network Device is NO Longer connected to the network.
    9- The IP address becomes an available address in the network pool of Ip addresses.

    NB: 1)- T o set up a DHCP, you basically need a DHCP supported client(at least one) and a Router, and a DHCP Server.
    2)- DHCP is merely designed as an extension of the BOOTP functionality, and not as a replacement.
    - BOOTP indirectly uses a form of leasing that Never Expire.

    I hope this information can be of some help to the numerous 'connectivity' issues we face.
  • vamoursly
    Trusted Tech

    250+ Posts
    • Sep 2011
    • 273

    #2
    Re: DHCP - How it works.

    Good reminder for people, best practice for devices, such as servers, routers, printer, copiers;

    Static IP address, either configured on the device and an exclusion added to the DHCP scope, or a DHCP reservation in the scope, based on the devices MAC address, so it gets the same IP address reliably.

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