Ping the DNS server from the router using its IP address, and make sure that the ip name-server command is used to configure the IP address of the DNS server on the router. Router# ping Translating "server (255.255.255.255)Ĭomplete these steps to troubleshoot this problem:Įnsure the router can reach the DNS server. Router#undebug allAll possible debugging has been turned off % Unrecognized host or address, or protocol not running. Under rare conditions, you may see one of these error conditions: Router# debug ip udp Success rate is 100 percent (5/5), round-trip min/avg/max = 224/228/236 ms Troubleshooting Ip name-server 192.168.1.100 !- Configures the IP address of the name server. This example shows a sample configuration on a router configured for basic DNS lookup: Sample Basic DNS Lookup Configuration This feature makes it easier to identify a router because the router is displayed by name rather than by its router ID or neighbor ID. Do not include the initial period that separates an unqualified name from the domain name.Ĭonfigures Open Shortest Path First (OSPF) to look up DNS names for use in all OSPF show EXEC command displays.
#CCNA NETWORK VISUALIZER DISABLE DNS LOOKUP SOFTWARE#
If there is a domain list, the default domain name is not used.ĭefines a default domain name that the Cisco IOS software uses to complete unqualified host names (names without a dotted-decimal domain name). Note: If there is no domain list, the domain name that you specified with the ip domain-name global configuration command is used. Specifies the address of one or more name servers.ĭefines a list of domains, each to be tried in turn. Use these commands to do so: CommandĮnables DNS-based host name-to-address translation. Your router can be configured to use DNS lookups if you wish to use the ping or traceroute commands with a host name rather than an IP address. Conventionsįor more information on document conventions, refer to the Cisco Technical Tips Conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on these software and hardware versions: Readers of this document should have knowledge of these topics: The purpose of this document is to bring together certain points about Domain Name System (DNS) use by Cisco routers.
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