Deprecated Linux Networking Commands and Their Replacements

Linux is a very popular operating system among developers and system administrators due to its strong and robust command-line interface (CLI). However, some of the networking commands have become outdated over time, making way for newer and more efficient options. In this article, we'll have a look at some of the deprecated commands and their new modern-day replacements to help you keep up with your Linux networking configurations.

In this tutorial, we'll go through each of the deprecated commands and their corresponding substitutions. We'll also provide examples of how to use the new commands. By the end of this article, you'll have a clear understanding of the new networking commands in Linux systems.

Deprecated Linux Networking Commands and Their Replacements

1. ifconfig ? ip

ifconfig was a commonly used command for network configuration, but it has been deprecated and replaced with the more powerful ip command.

ifconfig was used to view and configure network interfaces and display their configurations. However, it had a number of limitations and security problems that made it unreliable. As a result, the new ip command was introduced, which is more powerful and flexible than the ifconfig command.

The ip command is a powerful tool that is used for network management on Linux systems. It allows a user to view and configure various aspects of network interfaces and routing tables.

Here's an example of how to use the ip command to view the configurations of the network interfaces ?

$ sudo ip addr show

This output of the above command will display the configurations of all the network interfaces, similar to the ifconfig command. It will show the IP addresses, MAC addresses, and other details for each interface.

2. route ? ip route

The route command was used to view and configure the kernel routing table in a Linux machine. However, it has been deprecated and replaced with the ip route command.

The ip route command is much more powerful and adaptable than the route command, and it can configure routing tables in more refined ways. With this command, you can view the contents of the routing table, add or delete routes, and modify various routing-related settings.

Here is an example of how to use the ip route command ?

$ sudo ip route show

This command is going to display the kernel routing table and its configurations. This routing table shows how packets should be forwarded between different networks based on their destination IP addresses.

3. arp ? ip neigh

The arp command was used to display and modify the Address Resolution Protocol (ARP) cache. However, it has been deprecated and replaced with the ip neigh command.

The ip neigh command provides similar functionality to the arp command but has some additional features. It is used to view and manage the kernel's ARP cache, which stores information about other network devices on the same network segment.

Here is an example of how to use the ip neigh command to display the ARP cache ?

ip neigh show

The ip neigh show command will specifically show the contents of the ARP cache, including the IP address, MAC address, and interface information for each device in the cache.

4. netstat ? ss

The netstat command was commonly used to display network connections, routing tables, and interface statistics in Linux systems. However, it has been deprecated and replaced with the new ss command.

The ss command (short for "socket statistics") is a Linux utility that is used to display detailed information about the network sockets and connections. It is more efficient and faster than netstat, and it provides more detailed information about network connections.

Here is an example of how to use the ss command ?

$ sudo ss -tunap

This output of the above command will display information about all TCP and UDP sockets, including their state and associated processes, as well as the local and remote addresses.

5. iptables ? nftables

The iptables command was used to configure firewall rules and packet filtering in Linux. However, it has been deprecated and replaced with the nftables command.

nftables is a Linux command-line utility used for managing the Linux kernel's packet filtering framework. It is a modern replacement for the older iptables firewall system and offers enhanced performance, scalability, and ease of use.

With nftables, you can define rules for filtering network traffic based on a variety of criteria, such as source and destination IP addresses, TCP/UDP port numbers, and packet contents. You can also define rules for forwarding, dropping, or accepting packets, among other actions.

Here is an example of how to use the nftables command to create a simple firewall rule ?

sudo nft add rule ip filter input tcp dport 22 accept

This command will allow incoming TCP traffic on port 22 (SSH), which is useful for remote access to a server.

The nftables command uses a hierarchical structure to organize firewall rules, which makes it easier to manage complex configurations. Additionally, nftables has a simpler syntax for defining rules, which can help reduce errors and improve security.

6. hostname ? hostnamectl

The hostname command was used to set or display the hostname of a Linux system. However, it has been deprecated and replaced with the hostnamectl command.

hostnamectl is a Linux command-line utility used to view and manage the hostname and related system settings on a Linux system. It is available on most modern Linux distributions and is typically used with administrative privileges.

With hostnamectl, you can perform a variety of tasks related to the system's hostname and domain name settings, such as ?

• View the current hostname and related information

• Set a new static hostname

• Set a new transient hostname (which resets after a reboot)

• Change the system's domain name

Here is an example of how to use the hostnamectl command to view the current hostname ?

hostnamectl

The output of above command will display the current hostname and other related information.

Comparison Table

Conclusion

In this article, we've gone through six deprecated Linux networking commands and their modern replacements. These new commands provide better functionality, enhanced performance, and more comprehensive features. By adopting these new commands, you can improve your networking experience on Linux and take advantage of the advanced capabilities they offer.