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Instant AP DHCP with Ip helper

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  • 1.  Instant AP DHCP with Ip helper

    Posted Dec 02, 2011 12:38 PM

    I would like  to know if you guys have seem this happening... it looks like  a bug to me...

     

    Here is the Scenario that works
    AP for example in a network 192.168.1.0/24  i got a DHCP server on that network
    The AP gets its address via DHCP everything works correctly there

    Scenario in which it doesnt work.

    The AP is on the network 192.168.1.0/24
    The DHCP Server is on the network 192.168.2.0/24
    On the switch i got an ip helper  pointing to the DHCP server which is on the 192.168.2.0/24 network
    The ip helper WORKS correctly because i tested it with my computer and my computer get the DHCP IP address.

     

    As you see in the booting process
    AG7240: done cfg2 0x7115 ifctl 0x10000 miictrl 
    ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
    Picked up default IP a9fe7695, rand 7695
    Default IP is ready

    DHCP timed out.
    Default IP comes up.
    ip_time_handler: Got ip and packets on bond0 Started master election 4-0
    DHCP timed out.
    Default IP comes up.
    169.254.118.149 255.255.0.0
    Starting Webserver

    You see it gets the default ip addresss 169.x.x.x

     

     

    Now if i reboot the AP and enter in APboot MODE and do this

    apboot> dhcp
    eth0 up: 100 Mb/s full duplex
    DHCP broadcast 1
    DHCP IP address: 172.28.1.11
    DHCP subnet mask: 255.255.255.0
    DHCP def gateway: 172.28.1.1
    DHCP DNS server: 172.16.3.215
    DHCP DNS domain: carloslab.local
    apboot>

    You see it gets the IP...

    I just want to confirm is this is a bug, or if im doing something incorrectly.



  • 2.  RE: Instant AP DHCP with Ip helper

    Posted Dec 02, 2011 06:47 PM

    I think Aruba Support @ 1800-WIFILAN can help you confirm if this is a bug or not.



  • 3.  RE: Instant AP DHCP with Ip helper

    Posted Dec 02, 2011 06:48 PM

    What is the OS version you are running?



  • 4.  RE: Instant AP DHCP with Ip helper

    Posted Dec 02, 2011 07:15 PM

    the lastest firmware to download...

    I already got a case open... but i wanted to know if you guys had the same issue ?  or smoeone succesfully gave dhcp with ip helper to the instant APs?



  • 5.  RE: Instant AP DHCP with Ip helper

    Posted Dec 06, 2011 05:41 AM

    Hi NightShade,

    DHCP relay works fine in my setup, I used a H3C switch, which switch you used?

     

     



  • 6.  RE: Instant AP DHCP with Ip helper

    Posted Dec 06, 2011 09:12 PM

    alcatel switches



  • 7.  RE: Instant AP DHCP with Ip helper

    Posted Dec 07, 2011 09:07 AM

    It seems work fine on H3C and Cisco Switch, but realy reproduced on Alcatel-lucent Switch.



  • 8.  RE: Instant AP DHCP with Ip helper

    Posted Dec 07, 2011 09:15 AM

    Well thats weird... with the one that it should work its with alcatel switches as, Alcatel sells Wireless controllers of aruba networks...

    Ill try with another model to see if it works...

    I also got the lastest maintanice release of my alcatel switch...



  • 9.  RE: Instant AP DHCP with Ip helper
    Best Answer

    Posted Dec 15, 2011 10:33 PM

    I try to change the Ip helper forward delay to 0 (default 3), It works for me, but It does not make sense, with same delay time can forward some discover packets success, Other discover packets failed.

     

    -> show ip helper

     Ip helper :   Forward Delay(seconds) = 0,  

    Max number of hops     = 5,  

    Relay Agent Information            =  Disabled,  

    DHCP Snooping Status               =  Disabled  

     DHCP Snooping Bypass Opt82-Check   =  Disabled,  

     DHCP Snooping Opt82 Format  =  Base MAC,  

     DHCP Snooping Opt82 String  =  00:e0:b1:c6:a2:c2,  

    DHCP Snooping Binding DB Status    =  Disabled,

      PXE support                        =  Disabled,

       Forward option     = standard       Vlan Number NA   Bootup Option Enable   Bootup Packet Option DHCP       Forwarding Address :         10.65.77.2   UDP Relay on Default VRF = Enabled

    ->



  • 10.  RE: Instant AP DHCP with Ip helper

    Posted Mar 08, 2012 04:23 PM

    i didnt see your asnwer! i just test what you said it work perfectly now

    Thank you very much man kudos!!!!!!

    how did you figured that out? like you says it make no sense...



  • 11.  RE: Instant AP DHCP with Ip helper

    Posted Apr 28, 2016 11:51 AM

    Lets me try with my demo products.



  • 12.  RE: Instant AP DHCP with Ip helper

    Posted Mar 30, 2020 05:19 AM

    Sames setup working perfect over here. Using Firewalls for dhcp relay.

     

    Do you have any mgmt vlan configured ?



  • 13.  RE: Instant AP DHCP with Ip helper

    Posted Mar 30, 2020 01:42 PM

    This thread is several years old. If there are new issues, please start a new thread for better visibility.



  • 14.  RE: Instant AP DHCP with Ip helper

    Posted Apr 28, 2016 11:50 AM

    May be you need to install a sniffer on the network of your client to know who equipment send the IP 172.x.x.x. (Ip conflict)  Also you can help you the IMC software with the NTM module (Demo) to resolved this issue. May be has another DHCP server on the network.

    Regards

     

    GC