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Frequent Contributor I
Posts: 178
Registered: ‎05-18-2011

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

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

MVP
Posts: 974
Registered: ‎04-13-2009

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

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.
Cheers
James

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Guru Elite
Posts: 20,981
Registered: ‎03-29-2007

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

[ Edited ]

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.



Colin Joseph
Aruba Customer Engineering

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