Concept Guide

The following sections describe DNS and the resolution of host names.
• Enabling Dynamic Resolution of Host Names
• Specifying the Local System Domain and a List of Domains
• Conguring DNS with Traceroute
Name server, Domain name, and Domain list are VRF specic. The maximum number of Name servers and Domain lists per VRF is six.
Enabling Dynamic Resolution of Host Names
By default, dynamic resolution of host names (DNS) is disabled.
To enable DNS, use the following commands.
• Enable dynamic resolution of host names.
CONFIGURATION mode
ip domain-lookup
• Specify up to six name servers.
CONFIGURATION mode
ip name-server ip-address [ip-address2 ... ip-address6]
The order you entered the servers determines the order of their use.
Example of the show hosts Command
To view current bindings, use the show hosts command.
DellEMC>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
DellEMC>
To view the current conguration, use the show running-config resolve command.
Specifying the Local System Domain and a List of
Domains
If you enter a partial domain, Dell EMC Networking OS can search dierent domains to nish or fully qualify that partial domain.
A fully qualied domain name (FQDN) is any name that is terminated with a period/dot. Dell EMC Networking OS searches the host table
rst to resolve the partial domain. The host table contains both statically congured and dynamically learnt host and IP addresses. If Dell
EMC Networking OS cannot resolve the domain, it tries the domain name assigned to the local system. If that does not resolve the partial
domain, Dell EMC Networking OS searches the list of domains congured.
To congure a domain name or a list of domain names, use the following commands.
• Enter up to 63 characters to congure one domain name.
CONFIGURATION mode
ip domain-name name
• Enter up to 63 characters to congure names to complete unqualied host names.
CONFIGURATION mode
470
IPv4 Routing