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17-9
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 17 Configuring Basic Settings
Monitoring DNS Cache
Monitoring DNS Cache
The ASA provides a local cache of DNS information from external DNS queries that are sent for certain
clientless SSL VPN and certificate commands. Each DNS translation request is first looked for in the
local cache. If the local cache has the information, the resulting IP address is returned. If the local cache
can not resolve the request, a DNS query is sent to the various DNS servers that have been configured.
If an external DNS server resolves the request, the resulting IP address is stored in the local cache with
its corresponding hostname.
To monitor the DNS cache, see the following pane:
Feature History for DNS Cache
Table 2 lists each feature change and the platform release in which it was implemented. ASDM is
backward-compatible with multiple platform releases, so the specific ASDM release in which support
was added is not listed.
Path Purpose
Tools > Command Line Interface
Type show dns-hosts, then press Send.
Show the DNS cache, which includes dynamically learned
entries from a DNS server as well as manually entered name
and IP addresses using the name command.
Table 2 Feature History for DNS Cache
Feature Name
Platform
Releases Feature Information
DNS Cache 7.0(1) DNS cache stores responses that allow a DNS server to
respond more quickly to queries.
We introduced the following screen: Configuration >
Device Management > DNS.