264 | IPv4 Routing
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Resolution of Host Names
Domain name service (DNS) maps host names to IP addresses. This feature simplifies commands such as
Telnet and FTP by allowing you to enter a name instead of an IP address.
Dynamic resolution of host names is disabled by default. Unless you enable the feature, the system
resolves only host names entered into the host table with the
ip host command.
• Enable Dynamic Resolution of Host Names
• Specify Local System Domain and a List of Domains
• DNS with Traceroute
Enable Dynamic Resolution of Host Names
By default, dynamic resolution of host names (DNS) is disabled.
To enable DNS, use the following commands in CONFIGURATION mode:
To view current bindings, use the
show hosts command (Figure 14-5).
Figure 14-5. show hosts Command Example
To view the current configuration, use the show running-config resolve command.
Command Syntax Command Mode Purpose
ip domain-lookup
CONFIGURATION Enable dynamic resolution of host names.
ip name-server ip-address
[ip-address2 ... ip-address6]
CONFIGURATION Specify up to 6 name servers. The order you entered the
servers determines the order of their use.
FTOS>show host
Default domain is force10networks.com
Name/address lookup uses domain service
Name servers are not set
Host Flags TTL Type Address
-------- ----- ---- ---- -------
ks (perm, OK) - IP 2.2.2.2
patch1 (perm, OK) - IP 192.68.69.2
tomm-3 (perm, OK) - IP 192.68.99.2
gxr (perm, OK) - IP 192.71.18.2
f00-3 (perm, OK) - IP 192.71.23.1
FTOS>
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