DHCP requests for renew

Discussion in 'Windows Networking' started by roshak31, Feb 27, 2008.

  1. roshak31

    roshak31 Guest

    I purchased Voip phones and they have worked fine for two months. But for the
    last three day once a day they keep rebooting for up to half an hour at first
    I thought it might be the something wrong with the phones or something wrong
    with the switches. Then I looked at DCHP in my windows 2003 server and I
    noticed that most of the IPs of the computers were also renewing in dhcp at
    the same time. They keep renewing every six minutes for about a half hour or
    so then the network is fine. The phones and computers are differnet switches.
    What could cause a the DHCP to start renew ips every six minutes for a half
    hour then quit?
     
    roshak31, Feb 27, 2008
    #1
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  2. Hello,

    Thank you for your post.

    To get a better understanding of this issue, I'd like to ask you several
    questions before going further.

    1. I think the VoIP phone devices are connected to the switches and obtain
    IP addresses from the DHCP server directly. Is this correct?

    2. If yes, how do you verify it is DHCP Client computers but not VoIP phone
    devices that are renewing their IP addresses? Could you please also tell me
    how do you verify that the renewal interval is six minutes?

    3. If you disconnect all VoIP phone devices from the network, will other
    DHCP Client computers continue renew their IP addresses every six minutes?

    4. How do you configure the lease duration on DHCP scopes? If the lease
    duration is set to 12 minutes, then DHCP Client will renew their IP
    addresses every six minutes (Half time of the duration.).

    5. Are all DHCP clients located in the same LAN or is there any DHCP relay
    configured? Please also describe the network topology for me.

    Thanks for your time and I look forward to hearing from you. : )

    Sincerely,
    Neo Zhu,
    Microsoft Online Support
    Microsoft Global Technical Support Center

    Get Secure! - www.microsoft.com/security
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    Jian-Ping Zhu [MSFT], Feb 28, 2008
    #2
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  3. Hello,

    Regarding your last email , I am just check and follow-up on your status.

    I was wondering , if you were available to try conduct test and answer my
    questions.

    Thank you for your time and attention.

    Sincerely,
    Neo Zhu,
    Microsoft Online Support
    Microsoft Global Technical Support Center

    Get Secure! - www.microsoft.com/security
    =====================================================
    When responding to posts, please "Reply to Group" via your newsreader so
    that others may learn and benefit from your issue.
    =====================================================
    This posting is provided "AS IS" with no warranties, and confers no rights.
     
    Jian-Ping Zhu [MSFT], Mar 10, 2008
    #3
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