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Example: Configure a Device’s Unique Identity for the Network
To use a device in a network, you must configure the device’s identity. Configuring the device's identity makes the device accessible on the network and allows other users to log in to it. You can refer to any Internet-connected device in either of two ways:
-
By its IP address
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By its hostname
Once you have a hostname, you can:
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Find the IP address
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Use the Domain Name System (DNS) to resolve an IP address from a hostname
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Manually map the hostname to a static IP address
Using DNS is an easy and scalable way to resolve IP addresses from hostnames. However, you might not have a DNS entry for the device. You might not want the computer to contact the DNS server to resolve a particular IP address. Perhaps you use this particular IP address frequently. Maybe you use it only for testing or development purposes and do not want to give it a DNS entry.
To configure a device's unique identity, you might need to include some or all of the following details: The hostname of the device, its IP address, the domain name, and IP addresses for two or three domain name servers.
Requirements
You don't need to do any special configuration beyond device initialization.
Overview
In this example, the hostname is the device’s name. Most people find it easier to remember a hostname than an IP address. The software uses the configured hostname as part of the command prompt, to prepend log files and other accounting information, and in other places where knowing the device identity is useful. You can also use the hostname to telnet to a device.
You append a domain name to hostnames that are not fully qualified. The domain name is the name of a network associated with an organization. For sites in the United States, domain names typically take the form of org-name.org-type—for example, “Juniper.net.”
If your hostname and IP address do not have a DNS entry in a name server, configure a static mapping. See Step 4 in the following procedure for an example.
This example uses the values given in the following table to configure each of these variables. You need to substitute data specific to your device and network for these values.
Name of Variable |
Value Used in Example |
Value You Substitute |
---|---|---|
|
|
Provide your value. |
|
|
Provide your value. |
|
|
Provide your value. |
|
|
Provide your value. |
Configuration
CLI Quick Configuration
To quickly configure a device using this example:
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Copy the following commands and paste the commands in a text file.
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Remove any line breaks.
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Change the values listed here to match your network configuration.
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Copy and paste the commands into the CLI at the
[edit]
hierarchy level. -
Enter
commit
in configuration mode.
set system domain-name device.example.net set system host-name example-re0 set system name-server 172.24.16.115 set system name-server 192.0.2.10 set system static-host-mapping example-re0 inet 172.22.147.39
Configure the Device's Identity
Step-by-Step Procedure
To configure the identity settings of a device:
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Configure the domain name of your network.
[edit] user@host# set system domain-name device.example.net
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Configure the hostname of the device.
[edit] user@host# set system host-name example-re0
-
Configure from one to three name servers.
[edit] user@host# set system name-server 172.24.16.115 user@host# set system name-server 192.0.2.10
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Map the device hostname to its IP address.
[edit] user@host# set system static-host-mapping example-re0 inet 172.22.147.39
Results
To check the configuration, use the configuration mode show
system
command.
[edit] user@host# show system domain-name device.example.net; host-name example-re0; name-server { 172.24.16.115; 192.0.2.10; } static-host-mapping { example-re0 { inet 172.22.147.39; } }
When you have the correct configuration, enter commit
.
Verification
Verify the Hostname and the IP Address of the Device
Purpose
Verify that the hostname and the IP address of a device are as expected.
Action
Issue the show host host-name
operational
command.
user@example-re0> show host newton newton.device.example.net is an alias for example-re0.device.example.net. example-re0.device.example.net has address 172.22.147.39