Accessing and modifying DHCP properties on Cisco ASA 5505

Posted on 2012-09-06
Last Modified: 2012-09-12
Working on spinning up a new DC & DHCP virtual machine at a client site. Noticed the clients are getting DHCP from Cisco ASA 5505.This is a new client and I am not very familiar with the device.

I want to be able to log into the Cisco ASA device(not sure how) and turn off the DHCP so that windows server is DHCP master on this subnet. I don't want competing DHCP server. We can always turn on DHCP on the Cisco if needed

Related question - Client says DHCP is on at the Cisco for 'backup DHCP'. I'm inclined to think this is a manual backup method.  Or, it possible the Cisco ASA 5505 is serving as a backup for the Windows DHCP server, and how is that configuration made - such that it determines the Windows DHCP server is down and takes over. I'm not aware of any such config. Setting.
Question by:StewartTechnologies
    LVL 12

    Accepted Solution

    Two ways to access the ASA5505:

    1. Get Putty (or any telnet client) and start a telnet session to the IP address of the Cisco ASA.
    2. For you the preferred method - Open a browser and type https://ip_address_of_asa. Then, select "download and run" Cisco ASDM from the choices. Once installed, put in the IP address of the ASA and the username/password combo.

    Either way you will need to know the username and password or the ASA. The default is:
    username: (blank)
    password: (blank)

    Once into the ASA, the easiest way to turn off DHCP is to go to CONFIGURATION and then in the left pane expand DHCP and then click on DHCP SERVER.

    Click the INSIDE interface from the right window and click the EDIT button. Now uncheck the "Enable DHCP server".

    Click OK. Go To FILE > Save Running Configuration to Flash.

    Author Comment

    I have tried your option 2, and I am not getting prompted to download the Cisco ASDM. Using Ip address
    Is there another way to get the Cisco ASDM?
    LVL 12

    Expert Comment

    Are you seeing the ASA's internal webpage? You should see the same (or similar) to the attached screenshot.
    LVL 12

    Assisted Solution

    You can get Putty ( Save the exe file and then double click to run it. In the Host Name box type the For connection type select Telnet. Click the OPEN button.

    Enter the password when prompted and hit enter.
    Type en and hit enter - enter the "enable" password (usually the same as the first password).
    Type no dhcpd enabled inside
    Hit enter.
    Type wr mem
    hit enter.

    Author Comment

    Thank you. I am now able to get in. I had to include the port number as well.

    Author Closing Comment

    We were able to accomplish what was needed. Thank you for help.

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