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Linux Commands Cheat Sheet - Networking


(@sravan)
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Joined: 9 months ago
Posts: 39
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This cheat sheet provides a foundational set of commands for managing and troubleshooting network issues in Linux. With these tools, you can monitor network performance, diagnose problems, and configure network settings.

Command Description
ping host Send ICMP ECHO_REQUEST packets to a host to test connectivity.
ifconfig Display or configure a network interface (deprecated in favor of ip command in many distributions).
ip addr show Show information for all network interfaces.
ip link show Show state of all network interfaces.
netstat -tuln List all TCP and UDP ports listening on the system.
ss -tuln An alternative to netstat that is faster and more informative, lists listening ports.
traceroute host Trace the route packets take to reach the network host.
tracepath host Similar to traceroute but does not require root privileges.
nslookup domain Query Internet domain name servers for DNS information.
dig domain Fetch DNS information of a domain (more detailed than nslookup).
host domain Lookup DNS information of a domain, simpler than dig.
hostname -I Display the IP addresses associated with the host.
ip route show Show routing table.
route -n Show or manipulate the IP routing table (considered deprecated for ip route).
arp -a Display the ARP (Address Resolution Protocol) cache.
iwconfig Configure wireless network interfaces (use iw for newer replacements).
tcpdump Capture and display network packets. Requires root privileges.
nmap Network exploration tool and security scanner.
nc or netcat Utility for reading and writing across network connections using TCP or UDP.
iptables -L List all active firewall rules set by iptables.
firewall-cmd --list-all List firewall settings using firewalld (Red Hat/CentOS).
ufw status Show status of firewall using Uncomplicated Firewall (UFW) (Debian/Ubuntu).
sshd SSH daemon for accepting incoming SSH connections.
scp source target Securely copy files between hosts on a network.
rsync -av source target Synchronize files/directories between two hosts.
wget URL Download files from the web.
curl URL Transfer data from or to a server, with URL syntax.
lsof -i List open files and the corresponding network connections.
mtr host Combines the functionality of traceroute and ping in a single network diagnostic tool.
iftop Display bandwidth usage on an interface.
iptraf Interactive Colorful IP LAN Monitor.
nload Visualize network traffic and bandwidth usage.

   
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