Wireless Access

last person joined: yesterday 

Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
Back to discussions
Expand all | Collapse all

How to find out DHCP Server IP & VLAN if the IP address and VLAN doesn't exist on the configuration

This thread has been viewed 0 times

  • 1.  How to find out DHCP Server IP & VLAN if the IP address and VLAN doesn't exist on the configuration

    Posted Feb 10, 2017 03:46 AM

    How to find out the DHCP Server ip address or VLAN ID if the IP address and VLAN doesn't exist  and not valid on the network configuration? How to find out the root cause? Please advise

     

    Because from the Aruba controller console it was show IP address which is doesn't exist and not valid on the network configuration. Example:

    Doesn't exist and not valid on the configuration:

    * 192.168.1.XXX

    * 100.97.49.XXX

     

    Valid IP range:

    * 10.16.xxx.xxx



  • 2.  RE: How to find out DHCP Server IP & VLAN if the IP address and VLAN doesn't exist on the configuration

    Posted Feb 10, 2017 04:33 AM
    I'm not 100% sure what you mean. "show ip interface brief" will show you the IP addresses assigned.

    Can't you just ask the customer what the DHCP server IP address is?

    If the DHCP server is providing address for clients you could wireshark the client traffic to find the DHCP server IP.


  • 3.  RE: How to find out DHCP Server IP & VLAN if the IP address and VLAN doesn't exist on the configuration

    EMPLOYEE
    Posted Feb 10, 2017 06:21 AM
    @jordontin wrote:

    How to find out the DHCP Server ip address or VLAN ID if the IP address and VLAN doesn't exist  and not valid on the network configuration? How to find out the root cause? Please advise

     

    Because from the Aruba controller console it was show IP address which is doesn't exist and not valid on the network configuration. Example:

    Doesn't exist and not valid on the configuration:

    * 192.168.1.XXX

    * 100.97.49.XXX

     

    Valid IP range:

    * 10.16.xxx.xxx

    Do you have a log or a piece of the configuration you are talking about?  It might not be tied to a VLAN.