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DHCP IP Helper

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  • 1.  DHCP IP Helper

    Posted Jun 13, 2023 09:20 AM

    Hi 

      i have 10 different vlans config in 6300m switch and windows dhcp server config with all ip scope . assigned 10.10.2.3 ip to dhcp server and config this to all vlan interface . server ping from switch and server to switch also pinging  .

    but vlans not getting ip from dhcp server what is the issue 

    if i miss any config please suggest me 

    Core-Switch-Noble(config)# sh ip helper-address
     
     IP Helper Addresses
     
     Interface: vlan12
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan13
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan14
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan15
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan16
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan17
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan18
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan19
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default
     
     Interface: vlan20
      IP Helper Address                   VRF
      -----------------                  -----------------
      10.10.2.3                           default



  • 2.  RE: DHCP IP Helper

    Posted Jun 14, 2023 01:07 AM

    Can the VLANS ping the server?




  • 3.  RE: DHCP IP Helper

    Posted Jun 14, 2023 03:50 AM
    Yes VLAN Ping the server

    --






  • 4.  RE: DHCP IP Helper

    Posted Jun 14, 2023 03:58 AM

    Yes VLAN ping the server 

    but now we deicide to config dhcp server on 6300m 

    config done but issue vlan use is not accessing internet NIC show internet access but when we browse nothin open 

    VRF Name           : default
    DHCP Server        : enabled
    Operational State  : operational
    Authoritative Mode : true
     
    Config_status  : Pending
     
    Pool Name          : VLAN12-DESKTOP
    Lease Duration     : infinite
     
    DHCP dynamic IP allocation
    ----------------------------
    Start-IP-Address           End-IP-Address             Prefix-Length
    -----------------          ---------------            -------------
    10.10.4.2                  10.10.5.254                23
     
     
    DHCP Server options
    ---------------------
    ***************************************************
    Note:DHCP Server well known option number mapping:
    default-router(3), Dns-server(6), Domain-name(15),
    Netbios-name-server(44), Netbios-node-type(46)
    ***************************************************
    Option-Number       Option-Type          Option-Value
    --------------      ------------         -------------
     3                  ip                   10.10.4.1
     
     
    DHCP Server static IP allocation
    ----------------------------------
    DHCP Server static host is not configured.
     
     
    BOOTP Options
    ---------------
    Boot-File-Name            TFTP-Server-Name            TFTP-Server-Address            Next-Server-Address
    ---------------           -----------------         ---------------------           ---------------------
    *                         *                              *                              *
     
    Pool Name          : VLAN13-Wifi-AP
    Lease Duration     : infinite
     
    DHCP dynamic IP allocation
    ----------------------------
    Start-IP-Address           End-IP-Address             Prefix-Length
    -----------------          ---------------            -------------
    10.10.6.2                  10.10.7.254                23
     
     
    DHCP Server options
    ---------------------
    ***************************************************
    Note:DHCP Server well known option number mapping:
    default-router(3), Dns-server(6), Domain-name(15),
    Netbios-name-server(44), Netbios-node-type(46)
    ***************************************************
    Option-Number       Option-Type          Option-Value
    --------------      ------------         -------------
     3                  ip                   10.10.6.1
     
     
    DHCP Server static IP allocation
    ----------------------------------
    DHCP Server static host is not configured.
     
     
    BOOTP Options
    ---------------
    Boot-File-Name            TFTP-Server-Name            TFTP-Server-Address            Next-Server-Address
    ---------------           -----------------         ---------------------           ---------------------
    *                         *                              *                              *
     
    Pool Name          : VLAN14-Biometric
    Lease Duration     : infinite




  • 5.  RE: DHCP IP Helper

    Posted Jun 14, 2023 04:05 AM

    You need to input DNS on the pool.




  • 6.  RE: DHCP IP Helper

    Posted Jun 14, 2023 04:22 AM

    now its working . Thanks 




  • 7.  RE: DHCP IP Helper

    Posted Jun 14, 2023 04:16 AM

    you can use dhcp-relay

    first enable dhcp-relay globally, then configure IP helper-address on the interface

    #show dhcp-relay

    https://www.arubanetworks.com/techdocs/AOS-CX/10.07/HTML/5200-7837/Content/Chp_DHCP/DHCPv4_relay_cmds/ip-hel-add-10.htm



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    NHN
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