MODERN LINUX NETWORK TROUBLESHOOTING

MODERN LINUX NETWORK TROUBLESHOOTING - PAKWAP https://pakwap.com/ RSS - PAKWAP https://pakwap.com/assets/img/images/logo.png RSS - PAKWAP https://pakwap.com/ admin@pakwap.com (admin) admin@pakwap.com (admin) Sun, 08 Feb 2026 11:14:03 +0500 🐧 MODERN LINUX NETWORK TROUBLESHOOTING – MADE SIMPLE! Whether you’re using Ubuntu, Debian, Fedora, Arch, or RHEL-based systems, this light-theme infographic walks you through modern Linux networking commands step by step — from checking IPs and routing to DNS, NetworkManager, and packet capture 🌐💻 🐧 Modern Linux Network Troubleshooting Guide Works on Ubuntu 20.04+, Debian 11+, RHEL/CentOS Stream, Rocky, Fedora, Arch 1️⃣ CHECK NETWORK INTERFACES & IP ADDRESS Copy code Bash ip addr show Purpose: Shows IP addresses (IPv4/IPv6) Confirms interface is UP Copy code Bash ip link show Purpose: Checks physical/logical interface state (UP/DOWN) 2️⃣ CHECK DEFAULT GATEWAY & ROUTING Copy code Bash ip route show Purpose: Displays routing table Confirms default gateway exists Copy code Bash ip route get 8.8.8.8 Purpose: Shows which interface & gateway traffic uses 3️⃣ TEST CONNECTIVITY Copy code Bash ping -c 4 127.0.0.1 Purpose: Tests local TCP/IP stack Copy code Bash ping -c 4 <gateway- ip> Purpose: Confirms LAN/router connectivity Copy code Bash ping -c 4 8.8.8.8 Purpose: Tests internet access without DNS Copy code Bash ping -c 4 google.com Purpose: Tests DNS + internet 4️⃣ DNS TROUBLESHOOTING (Modern systemd) Copy code Bash resolvectl status Purpose: Shows active DNS servers per interface Copy code Bash resolvectl query google.com Purpose: Tests DNS resolution directly Copy code Bash resolvectl flush-caches Purpose: Clears DNS cache 5️⃣ NETWORK MANAGER (Modern Linux) Copy code Bash nmcli device status Purpose: Shows device state (connected, disconnected) Copy code Bash nmcli connection show Purpose: Lists network profiles Copy code Bash nmcli device wifi list Purpose: Scans available Wi-Fi networks 6️⃣ CHECK LISTENING PORTS & CONNECTIONS Copy code Bash ss -tuln Purpose: Shows listening TCP/UDP ports Copy code Bash ss -antp Purpose: Shows active connections and processes 7️⃣ ARP / NEIGHBOR ISSUES (Modern Replacement) Copy code Bash ip neigh show Purpose: Shows ARP / neighbor table Copy code Bash ip neigh flush all Purpose: Clears stale ARP entries 8️⃣ TRACE NETWORK PATH & LATENCY Copy code Bash traceroute google. com Purpose: Finds where packets stop Copy code Bash mtr google. com Purpose: Continuous latency & packet-loss analysis 9️⃣ RESTART NETWORK SERVICES (Correct Way) Copy code Bash sudo systemctl restart NetworkManager Purpose: Safely restarts networking Copy code Bash sudo nmcli networking off && sudo nmcli networking on Purpose: Soft reset without reboot 🔟 PACKET CAPTURE (ADVANCED) Copy code Bash sudo tcpdump -i eth0 Purpose: Captures raw packets for deep debugging ❌ AVOID THESE (Deprecated) Command Status ifconfig Deprecated netstat Replaced by ss arp Replaced by ip neigh iwconfig Replaced by nmcli / iw /etc/init.d/networking Legacy 🧠 RECOMMENDED TROUBLESHOOTING Order ip addr show ip route show ping gateway ping 8.8.8.8 resolvectl query ss -tuln traceroute / mtr Save it, share it, and use it as your go-to Linux networking cheat sheet! Follow ANIK Digital and Information Technology for more clean, practical tech infographics 🚀 <a href="https://pakwap.com/search?query=Linux">#Linux</a> <a href="https://pakwap.com/search?query=LinuxNetworking">#LinuxNetworking</a> <a href="https://pakwap.com/search?query=NetworkTroubleshooting">#NetworkTroubleshooting</a> <a href="https://pakwap.com/search?query=SysAdmin">#SysAdmin</a> <a href="https://pakwap.com/search?query=DevOps">#DevOps</a> <a href="https://pakwap.com/search?query=ITSupport">#ITSupport</a> <a href="https://pakwap.com/search?query=OpenSource">#OpenSource</a> <a href="https://pakwap.com/search?query=TechTips">#TechTips</a> <a href="https://pakwap.com/search?query=DigitalSkills">#DigitalSkills</a> <a href="https://pakwap.com/search?query=CyberSecurity">#CyberSecurity</a> <a href="https://pakwap.com/search?query=OnlineSafety">#OnlineSafety</a> <a href="https://pakwap.com/search?query=TechHacks">#TechHacks</a> <a href="https://pakwap.com/search?query=RemoteWork">#RemoteWork</a> <a href="https://pakwap.com/search?query=USA">#USA</a> <a href="https://pakwap.com/search?query=Canada">#Canada</a> https://pakwap.com/topics/208?pid=294 MODERN LINUX NETWORK TROUBLESHOOTING REHAN Tue, 27 Jan 2026 14:58:28 +0500 Messages https://pakwap.com/topics/208?pid=294