System information

Troubleshooting Dialin Connections 16-367

Dialin: Modem Cannot Send or Receive IP Data

DNS

server not speciﬁed on router

or workstation

Step 1 Check to see whether the workstation and router both have DNS

information speciﬁed. On the router, use the show running-conﬁg

privileged exec command to see whether DNS is conﬁgured. For

information on verifying the workstation conﬁguration, refer to the

vendor documentation.

Step 2 If the router and workstation are not conﬁgured to use DNS, use the

ip domain-lookup, ip domain-name, and ip name-server

commands to conﬁgure the router.

Example:

The following example enables the IP DNS-based host

name-to-address translation:

ip domain-lookup

Example:

The following example deﬁnes cisco.com as the default domain

name:

ip domain-name cisco.com

Example:

The following example speciﬁes host 131.108.1.111 as the primary

name server and host 131.108.1.2 as the secondary server:

ip name-server 131.108.1.111 131.108.1.2

This command is reﬂected in the conﬁguration ﬁle as follows:

ip name-server 131.108.1.111

ip name-server 131.108.1.2

Conﬁgure a DNS server address in the TCP/IP software on the PC.

For more information, refer to the vendor documentation.

1 DNS = Domain Name System

Possible Causes Suggested Actions