unusual DHCP problem

Discussion in 'Server Networking' started by Junwei_wan, Dec 4, 2005.

  1. Junwei_wan

    Junwei_wan Guest

    Hi All,

    I have a DHCP problem, please see the following scenario:

    I have had a DHCP server (called “DHCP1†Win2k server) in my old domain
    (Domain A) for last three years, which has distributed ip addresses to the
    client machines without any problem; we have setup a new domain (Domain B)
    two months ago, I have setup another DHCP server (called “DHCP2†Win2k3
    server) which has been authorized in both domain’s Active Directory and
    decommissioned the old DHCP server (DHCP1); however the client machines are
    not able to get the ip addresses from the new DHCP server.

    I tried to setup another three machines (win2k and win2k3 boxes) as the new
    DHCP server, same results--- the client machines are not able to get the ip
    addresses from the new DHCP server; however as soon as I put the DHCP1 back,
    everything works fine, the client machines get the ip addresses from the old
    DHCP server instantly.

    Both DHCP servers are in the same VLAN, both domains have the trust
    relationship.

    Could any one tell me what is the root cause or possible reasons of my DHCP
    problem?

    Your help and information would be much appreciated.

    Regards

    John Wan
     
    Junwei_wan, Dec 4, 2005
    #1
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  2. Junwei_wan

    Todd J Heron Guest

    What type of switched support your VLAN? If Cisco you need to enable the IP
    Helper feature on them.
     
    Todd J Heron, Dec 5, 2005
    #2
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  3. Junwei_wan

    Junwei_wan Guest

    Hi Todd,

    We use RiverStone 8600 as the core infrastructure, I do not need the IP
    Helper feature on it as both DHCP servers are in the same VLAN.

    Also DHCP1 works just fine, but why not DHCP2.

    Thanks for your information and help.

    John Wan
     
    Junwei_wan, Dec 5, 2005
    #3
  4. Junwei_wan

    Todd J Heron Guest

    So you're saying that DHCP2, after being authorized, cannot give out IP
    configuration to clients in the same VLAN *even* with DHCP1 turned off and
    *after* having the clients run and ipconfig /release and ipconfig /renew?
     
    Todd J Heron, Dec 5, 2005
    #4
  5. Junwei_wan

    Junwei_wan Guest

    Hi Todd,

    That's right, Very strange indeed.

    John Wan
     
    Junwei_wan, Dec 5, 2005
    #5
  6. Junwei_wan

    Todd J Heron Guest

    Is DHCP2 using a static IP address? Any errors in it's event log? And on
    the client?
     
    Todd J Heron, Dec 5, 2005
    #6
  7. Junwei_wan

    Junwei_wan Guest

    Hi Tood,

    DHCP2 is using a static IP address, there are not any errors in it's event
    log and in the client's evenr log.

    However I have setup a Linux box dhcp server ten minutes ago, which is
    working fine, but why not windows DHCP?

    John Wan
     
    Junwei_wan, Dec 5, 2005
    #7
  8. Junwei_wan

    Todd J Heron Guest

    I think you need to delete rebuild the scope on DHCP2 sounds like something
    is corrupted inside the DHCP database.
     
    Todd J Heron, Dec 5, 2005
    #8
  9. Junwei_wan

    Junwei_wan Guest

    Hi Todd,

    I have rebuilt DHCP2 at least 10 times in 5 different machines, but no luck.

    Regards

    John
     
    Junwei_wan, Dec 5, 2005
    #9
  10. Junwei_wan

    kemics Guest

  11. Junwei_wan

    Junwei_wan Guest

    Hi Kemics,

    I did not export the DHCP settings from my original DHCP server as I used
    another three new scopes in my new box, which are diffrent from the two old
    existing scopes; What I actually did is that I setup a new DHCP server on
    anothe box, then manully creat the two new scopes, it just does not work.

    I may have to use the DHCP export database utility do the export old DHCP
    database, then import it into the new box.

    Regards

    John
     
    Junwei_wan, Dec 5, 2005
    #11
  12. Junwei_wan

    Junwei_wan Guest

    Hi J.Couch,

    There is no any local software firewall in the new DHCP server.

    John Wan


     
    Junwei_wan, Dec 6, 2005
    #12
  13. Junwei_wan

    kemics Guest

    I would use the export database utility and bring up the new server with your
    old scopes, then once everything is up and you are receiving IPs from your
    new server in the old scope, go ahead and change what you need to scope
    wise...

    Might seem a little bit odd that you have to export and import just to
    change everything, but trying just to add new scopes might be confusing your
    member servers as to what is going on...

    --
    --AOPC Network Tech
    If I answer your question, or help you, please let me know! Thanks


     
    kemics, Dec 6, 2005
    #13
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