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12-11

Domain Name System (DNS) Services

Troubleshooting DNS

When the ProCurve Secure Router cannot correctly resolve domain names,

you can monitor DNS error messages to pinpoint the source of the problem.

You should be able to interpret DNS messages well enough to track the DNS

process and determine where problems arise.

Caution Enabling DNS debug messages can seriously compromise the network as the

router is forced to debug the many DNS requests arriving from clients.

Before enabling debug messages, you can check for some of the most common

problems described in the next section.

You should also determine that all connections are up and that hosts can ping

each other. In other words, you should be certain that basic connectivity is

not the root of the problem.

Process

First, determine whether the router is acting as a DNS client or a DNS server.

Then activate the corresponding debug messages.

The ProCurve Secure Router acts as a DNS server when it:

■ receives DNS requests from hosts on its network

■ checks its host table for a matching entry

■ forwards queries to an external DNS server

■ forwards the IP address for a hostname to a DNS client

The ProCurve Secure Router acts as a DNS client when it:

■ sends a query to an external name server on its own behalf

Debugging DNS Server Activity

To monitor the router’s activity as it receives, forwards, and responds to DNS

requests, enter the following enable mode context command:

ProCurve# debug ip dns-proxy

HP ProCurve 7000dl Series User Manual

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