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Thread: DHCP Pool

  1. Junior Member
    Join Date
    May 2016
    Posts
    11

    Certifications
    CompTIA A+, Network+, Cisco CCENT
    #1

    Default DHCP Pool

    Setting up DHCP pools for the 3 networks below:

    192.168.0.0-7 /29
    192.168.0.8-15 /29
    192.168.0.16-47 /27

    I set the pools up for the first two /29 networks and are assigned to the correct range of IP's but when I setup the pool for the /27 network it sets the pool range at 192.168.0.1 - 192.168.0.30. Any idea's? Cheers!

    Router-1(dhcp-config)#do sh ip dhcp pool


    Pool Management:
    Utilization mark (high/low) : 100 / 0
    Subnet size (first/next) : 0 / 0
    Total addresses : 6
    Leased addresses : 4
    Excluded addresses : 3
    Pending event : none


    1 subnet is currently in the pool
    Current index IP address range Leased/Excluded/Total
    192.168.0.1 192.168.0.1 - 192.168.0.6 4 / 3 / 6


    Pool Marketing:
    Utilization mark (high/low) : 100 / 0
    Subnet size (first/next) : 0 / 0
    Total addresses : 6
    Leased addresses : 2
    Excluded addresses : 3
    Pending event : none


    1 subnet is currently in the pool
    Current index IP address range Leased/Excluded/Total
    192.168.0.9 192.168.0.9 - 192.168.0.14 2 / 3 / 6


    Pool Sales:
    Utilization mark (high/low) : 100 / 0
    Subnet size (first/next) : 0 / 0
    Total addresses : 30
    Leased addresses : 0
    Excluded addresses : 3
    Pending event : none


    1 subnet is currently in the pool
    Current index IP address range Leased/Excluded/Total
    192.168.0.1 192.168.0.1 - 192.168.0.30 0 / 3 / 30
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  3. Senior Member
    Join Date
    Sep 2004
    Location
    New York
    Posts
    436

    Certifications
    MS IT, BS IT, CCIE R&S, CCNP, CCDP, CISSP, Sec+, VCA6-DCV, VCA6-NV
    #2
    You are crossing bit boundaries.

    /27

    0-31, 32-63, etc...

    do the address and mask in a binary "AND" and you will see where the boundaries are.
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  4. Senior Member mikeybinec's Avatar
    Join Date
    Mar 2014
    Location
    El Cajon, California
    Posts
    470

    Certifications
    CCENT (expired) CCNA R&S
    #3
    bit boundaries.... in other words, block sizes.. You can't do sizes of 8 than jump to a 32.. best to do the large block first than the 8s..If you have to stick with the 32, than start it at the .32 IP address after the 8 block size
    Cisco NetAcad Cuyamaca College
    A.S. LAN Management 2010 Grossmont College
    B.S. I.T. Management 2013 National University
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