HP ProCurve 7000dl Series Basic Management And Configuration Manual page 629

Domain Name System (DNS) Services
Troubleshooting DNS
Host Table Does Not Include a Hostname. If necessary, add an entry to
the host table. You can view the current entries in the running-config. Look
for a miskeyed entry. Delete the faulty entry from the host table before adding
the correct entry. (It is very easy to edit an entry in the Web browser interface;
see Chapter 14: Using the Web Browser Interface for Basic Configuration
Tasks.)
Often, however, the local host table does not contain the entry for a host
because it should not. The router only should have local hostnames in its host
table. The router should be able to communicate with external name servers
to receive IP addresses for hosts outside its own domain.
No External DNS Server. If the debug messages indicate that the router is
not forwarding queries, you should specify an IP address for at least one DNS
server. (See "Specifying DNS Server Addresses" on page 12-10.)
Forwarding Debug Message Repeats. If, on the other hand, you continu-
ally receive the Forwarding query... message, the router either cannot reach
the DNS server or the server cannot translate the hostname.
If the server cannot translate the name, there is little you can do beyond adding
another DNS server in hopes that it will provide better service. It is also quite
possible that the hostname is invalid.
If the server consistently fails to translate hostnames, you should remove it
from the system by entering no ip name-server <server A.B.C.D>. (Find
the address in the running-config.)
However, before writing hostnames and servers off, you should determine that
the router is actually reaching the server. Verify that the connection is up and
attempt to ping the server. (Tips for bringing up an interface can be found in
Chapter 3: Configuring Ethernet Interfaces, Chapter 4: Configuring E1 and
T1 Interfaces, Chapter 5: Configuring Serial Interfaces for E1- and T1-Car-
rier Lines, Chapter 6: Configuring the Data Link Layer Protocol for E1, T1,
and Serial Interfaces, and Chapter 7: ADSL WAN Connections.) If the router
cannot reach the server, verify that it knows a route to the server's subnet
(enter show ip route). You can learn how to add a static route and trouble-
shoot routing protocols in Chapter 11: IP Routing—Configuring Static
Routes.
No Default Domain Name. Also, check that the router is appending a
default domain name to resent queries and that this domain name is correct.
See "Adding an Entry to the Router's Host Table" on page 12-9 to learn how to
configure the default domain name.
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