[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 506
  • Last Modified:

Accessing and modifying DHCP properties on Cisco ASA 5505

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.
0
StewartTechnologies
Asked:
StewartTechnologies
  • 3
  • 3
2 Solutions
 
michaelgoldsmithCommented:
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.
0
 
StewartTechnologiesAuthor Commented:
I have tried your option 2, and I am not getting prompted to download the Cisco ASDM. Using Ip address 10.10.1.1
Is there another way to get the Cisco ASDM?
0
 
michaelgoldsmithCommented:
Are you seeing the ASA's internal webpage? You should see the same (or similar) to the attached screenshot.
asdm.jpg
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
michaelgoldsmithCommented:
You can get Putty (http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html). Save the exe file and then double click to run it. In the Host Name box type the 10.10.1.1. 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.
0
 
StewartTechnologiesAuthor Commented:
Thank you. I am now able to get in. I had to include the port number as well.
0
 
StewartTechnologiesAuthor Commented:
We were able to accomplish what was needed. Thank you for help.
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

  • 3
  • 3
Tackle projects and never again get stuck behind a technical roadblock.
Join Now