2.7. Results

  1. From the jumpbox open a terminal emulator window (black square icon with $ on the bottom application bar), and perform several recursive queries to your new listener to test.

    Repeat some of the same queries multiple times

    dig www.f5.com
dig www.wikipedia.org
dig www.umich.edu
dig www.example.com

  2. Viewing Cache Statistics

    Navigate to: Statistics ›› Module Statistics : DNS : Caches ›› Caches and then choose Caches from the ‘Statistics Type’ drop-down.

    ../../_images/router01_cache_click_view.png

    Examine the Query, Failure, and Cache details below.

    ../../_images/router01_cache_view_details.png

    https://router01.branch01.example.com/tmui/Control/jspmap/tmui/dns/cache/stats_detail.jsp?name=/Common/transparent_cache

Login to router01 (bigip) using Putty from your application bar at the bottom of your desktop. You can view the contents of the cache with the following TMSH command:

TMSH

tmsh show ltm dns cache records rrset cache transparent_cache

../../_images/tmsh_show_ltm_dns_cache_records.png

To view the cache statistics similar to what you saw in the GUI you can use:

TMSH

tmsh show ltm dns cache transparent transparent_cache

  1. Clearing Entire Cache

    Navigate to Statistics > Module Statistics > DNS > Caches

    Set “Statistics Type” to “Caches”.

    Select the cache and click “Clear Cache” to empty the cache. Note, this will clear the actual DNS cache on the BIG-IP. If you want to clear the cache statistics, select the cache and hit the Reset button.

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