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Impossible to obtain ip address from windows server dhcp

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  • 1.  Impossible to obtain ip address from windows server dhcp

    Posted Mar 26, 2024 04:16 AM

    Hello,

    First of all, thank you for your various help which will surely give me ideas. I have a problem getting ip address from a specific vlan that uses a windows DHCP server.

     In fact since last time, when I connect I cannot obtain an IP address on my AP 505 access point.

    The explanation seemed clearer to me with a diagram. Do you have an idea ?

    Knowing that if I untagged the terminal on vlan 1 the IP assignment works correctly for the ssid... Thanks!



  • 2.  RE: Impossible to obtain ip address from windows server dhcp

    EMPLOYEE
    Posted Mar 26, 2024 09:06 AM

    Is your DHCP server plugged into an access port on the switch that is configured for VLAN 1?  Or the default gateway for VLAN 1 has a DHCP helper configuration pointing at the DHCP server?



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 3.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 30 days ago

    Hello Chulcher,

    Thanks for your reply. My DHCP server plugged into an access port on the switch VLAN1




  • 4.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 30 days ago

    It's worked if i use vlan 1 on my acces point and update ip to 172.16.79.x

    But i wanna used vlan 23 because my network 172.16.79.x are no more ip adresss




  • 5.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 30 days ago

    Hi 

    i think vlan 1 should not be labeled on the ap. Your ssid vlan can be replaced with another vlan. The planning of vlan 1 is wrong.



    ------------------------------
    If my post was useful, please Accept Solution and Give Kudos.

    leo ma

    ACMX
    ------------------------------



  • 6.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 30 days ago

    Hi Leo,

    Thanks for your reply , but i can't change vlan 1 on the ap.  Otherwise I have to change all my switches  config etc .. Unless there is a way to access the 172.16.79.x network from another VLAN from the ap?




  • 7.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 30 days ago

    I think you can only use other vlan mapping172.16.79.x



    ------------------------------
    If my post was useful, please Accept Solution and Give Kudos.

    leo ma

    ACMX
    ------------------------------



  • 8.  RE: Impossible to obtain ip address from windows server dhcp

    EMPLOYEE
    Posted 30 days ago

    With a client connected, run "show clients status <mac-addr>" and see if the client is really getting assigned to VLAN 1.  If they are, then the problem is likely that you've not changed the IAP's "Switch uplink native VLAN" setting so the IAP doesn't know to tag VLAN 1 ("show datapath bridge", PVID for br0 needs to be 23).



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 9.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 29 days ago

    Hello Chulcher,

    Thanks for your reply , i think your answer help me so much.

    The client retrieves the correct VLAN 1

    You're right the pvid for br0 is currently 1 but how can I change? Are there any other changes that need to be made? Below are the commands. Thank you!




  • 10.  RE: Impossible to obtain ip address from windows server dhcp
    Best Answer

    EMPLOYEE
    Posted 29 days ago

    https://www.arubanetworks.com/techdocs/CLI-Bank/Content/instant/enet-vlan.htm

    or in the UI, the Advanced options of the System menu.



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 11.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 29 days ago

    Yes i have tried this configuration before but same result my clients can't obtain dhcp ip from windows dhcp server.. :(




  • 12.  RE: Impossible to obtain ip address from windows server dhcp

    EMPLOYEE
    Posted 29 days ago

    Set a static IP for the client, when connected to the wireless can the client ping the DHCP server?



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 13.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 29 days ago

    I tried with static ip same result , i can't ping dhcp server.




  • 14.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 29 days ago

    I think my configuration was wrong into my router 

    but i don't know why... :/




  • 15.  RE: Impossible to obtain ip address from windows server dhcp

    EMPLOYEE
    Posted 29 days ago

    So you have things working?  If not, you might create a new version of your diagram that actually shows all of what is connected where.  There may be some assumptions being made that aren't true.



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 16.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 28 days ago

    Hello Chulcher,

    Its working for all i can get dhcp and obtain ip adress for all SSID.

    I missing my configuration between my switch and my router where i have didn't taggued vlan 23 

    so now :

    But i can't reach  my IAP 172.16.241.x when i'am connected on switch with cable    but ok when i'm connected to ssid 3 ( and i obtain ip from dhcp server)
    And on my switch i got this warming  
    1/15 -> where my IAP is connected
    i don't know why and what it is?
    Thanks for your help !



  • 17.  RE: Impossible to obtain ip address from windows server dhcp

    EMPLOYEE
    Posted 28 days ago

    Reaching the IAP, that issue is probably routing or firewall related.

    I would guess that the CRC/alignment errors is a bad cable.



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 18.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 17 days ago
      |   view attached

    Chulcher,

    TThank you my problem is now solved. But I need a small turnout what is the difference between these 2 parameters, I feel like they are the same?




  • 19.  RE: Impossible to obtain ip address from windows server dhcp

    EMPLOYEE
    Posted 17 days ago

    System > Uplink switch native VLAN tells the IAP what the native VLAN is on the uplink port.

    Uplink management VLAN sets what VLAN the IAP will use for management.

    For IAP, the default behavior is that the IAP will be managed on the same VLAN as the uplink switch native VLAN.



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 20.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 16 days ago

    Chulcher,

    Thanks a lot ! Have a good day !




  • 21.  RE: Impossible to obtain ip address from windows server dhcp

    Posted 29 days ago

    Establish a DHCP helper address pointing to your main DHCP server on each of your vlans that are defined on your core routing switch. 

    Setup a scope for each vlan in your Windows DHCP server, and set your ip range, reserved ip addresses, options string to include the untagged vlan id, router, dns, ntp settings.