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What to Put in the “Search Domains” Field in Network Manager?

Ubuntu 16

Understanding the functionality of the “Search Domains” field in Network Manager is crucial in managing your network connections, especially when dealing with multiple servers. This article will provide an in-depth explanation of what to put in the “Search Domains” field and how it can be beneficial in your network management tasks.

Quick Answer

The "Search Domains" field in Network Manager is where you can enter a list of domains that the DNS resolver will use when resolving hostnames to IP addresses. It is beneficial for managing connections to multiple servers within a specific domain, saving time and effort in network management tasks.

Understanding the “Search Domains” Field

The “Search Domains” field is a part of the Network Manager where you can enter a list of domains. The Domain Name System (DNS) resolver will use these domains when attempting to resolve a hostname to an Internet Protocol (IP) address.

This feature is particularly useful when you frequently access servers within a specific domain and want to avoid typing the fully-qualified domain name each time.

How Does “Search Domains” Work?

When you input a domain in the “Search Domains” field, the DNS resolver will append this domain to the hostname during the resolution process. For instance, if you manage multiple servers at mycompany.com (like web1.mycompany.com, web2.mycompany.com, db.mycompany.com, etc.), you can add mycompany.com to the “Search Domains” field.

When you ping or Secure Shell (SSH) to a server such as web1, the resolver will first try to resolve web1. If it fails, it will then try web1.mycompany.com, which will likely succeed.

Practical Use of “Search Domains”

For users connecting to a domain server at work with multiple connected servers, you can input the names of the other servers you wish to search in the “Search Domains” field. This way, you can simplify the process of connecting to these servers.

However, for average users connecting to their Internet Service Provider (ISP), this field is typically left blank.

Example: Adding a Domain to the “Search Domains” Field

Here’s a simple example of how to add a domain to the “Search Domains” field in Network Manager:

  1. Open Network Manager.
  2. Navigate to the settings of the network connection you want to modify.
  3. In the IPv4 or IPv6 settings tab, you’ll find the “Search Domains” field.
  4. Enter mycompany.com (or your specific domain) in the field.
  5. Click Apply to save the changes.

Now, when you access a server like web1, the resolver will append mycompany.com to it, attempting to resolve it as web1.mycompany.com.

Conclusion

In conclusion, the “Search Domains” field in Network Manager is a convenient tool for managing connections to multiple servers within a specific domain. It simplifies the process of resolving hostnames to IP addresses, saving you time and effort in your network management tasks. However, for most users who are simply connecting to their ISP, this field is usually left blank.

Remember to always apply the changes after adding a domain to the “Search Domains” field. This ensures that the resolver can append the domain to the hostname during the resolution process.

What is the purpose of the “Search Domains” field in Network Manager?

The "Search Domains" field in Network Manager allows you to enter a list of domains that the Domain Name System (DNS) resolver will use when attempting to resolve a hostname to an IP address. It simplifies the process of connecting to servers within a specific domain by appending the domain to the hostname during the resolution process.

When should I use the “Search Domains” field in Network Manager?

You should use the "Search Domains" field in Network Manager when you frequently access servers within a specific domain and want to avoid typing the fully-qualified domain name each time. It is particularly useful in managing connections to multiple servers within a domain.

How does the “Search Domains” field work?

When you input a domain in the "Search Domains" field, the DNS resolver will append this domain to the hostname during the resolution process. For example, if you have added mycompany.com to the "Search Domains" field and you try to connect to a server named web1, the resolver will first try to resolve web1. If it fails, it will then try web1.mycompany.com, which will likely succeed.

Can I leave the “Search Domains” field blank?

Yes, you can leave the "Search Domains" field blank, especially if you are a regular user connecting to your Internet Service Provider (ISP). This field is typically used when managing connections to servers within a specific domain and may not be necessary for average users.

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