#networking
All articles tagged #networking — practical guides from production experience.
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23 posts tagged #networking · page 1 of 3
How to Trace Route in Linux: traceroute Examples
Use traceroute in Linux to diagnose network path issues — read hop output, interpret timeouts, use TCP mode to bypass firewalls, and identify where packets are being dropped.
How to Test TCP Connection in Linux: nc, curl, telnet
Test TCP connections in Linux using nc, curl, telnet, and /dev/tcp — verify port reachability, measure response time, and debug connection failures with real examples.
SSH Connection Refused Linux: Fix Guide
Fix SSH connection refused on Linux — diagnose why SSH won't connect, check sshd service and firewall, recover from lockout, and harden SSH without breaking access.
How to Restart Network Service in Linux (All Distros)
Restart network service in Linux using systemctl, nmcli, and ip commands — covering Ubuntu, RHEL, Debian, and CentOS with real examples and what to do when restart fails.
Port Already in Use Linux: How to Find and Fix It
Fix 'port already in use' errors on Linux — find what process owns the port, kill it safely, handle TIME-WAIT sockets, and prevent the issue from recurring.
ping vs curl vs telnet: Which to Use for Network Testing
Know when to use ping, curl, and telnet for network testing — what each tool tests, what its limitations are, and which to reach for first when debugging connectivity issues.
netstat vs ss: Which to Use and What's the Difference
netstat vs ss — understand the differences, when to use each, equivalent command translations, and why ss is the modern replacement for netstat on Linux.
Linux Check Open Connections: ss, netstat, lsof Examples
Check open network connections in Linux using ss, netstat, and lsof — see established connections, connection counts by state, and find which process owns each connection.
Linux Check Listening Ports with ss: Complete Guide
Check listening ports in Linux with ss — see TCP and UDP listeners, find which process owns each port, filter by interface binding, and detect unexpected services.