VMware ESXi Networking Basics: vSwitch, Port Groups and VLAN ID
Learn ESXi networking: virtual switch (vSS), uplinks vmnic, port groups, VLAN tagging for VMs, vmkernel ports for management,…
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Change Linux Hostname: hostnamectl, /etc/hostname and /etc/hosts
Change hostname on Linux with hostnamectl set-hostname, edit /etc/hostname and /etc/hosts, cloud VPS caveats, mail HELO and TLS…
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Linux Networking: ip, ping, traceroute and mtr (Troubleshooting Guide)
Troubleshoot Linux networking with ip addr/route, ping for reachability, traceroute for path hops, mtr for packet loss, and…
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lsof Command on Linux: Find Process Using a Port or File
Use lsof on Linux: list open files and sockets, lsof -i :PORT, who blocks umount, deleted files still…
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dig and nslookup on Linux: DNS Troubleshooting (A, MX, TTL, resolvers)
Troubleshoot DNS on Linux with dig and nslookup: read resolv.conf, query A/MX records, +trace, test against 8.8.8.8, NXDOMAIN…
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nftables on Linux: Basic Firewall Rules (SSH, HTTP/HTTPS) That Persist
Set up nftables on Linux: tables, chains, default drop, allow SSH and web ports, persist ruleset to /etc/nftables.conf,…
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ss Command on Linux: Listening Ports, Connections and Troubleshooting
Use ss on Linux instead of netstat: list listening TCP/UDP ports, show established connections, map sockets to PIDs,…
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Set Up an NTP Server on Linux with chrony for Your LAN
Turn a Linux host into an internal NTP server with chrony: allow your subnet, firewall rules, Linux and…
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SSH Tunneling and Port Forwarding on Linux: -L, -R, -D and ProxyJump
Learn SSH local, remote and dynamic port forwarding, ProxyJump bastion access, persistent tunnels with systemd, and how to…
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WireGuard VPN Server Setup on Linux (Step-by-Step Guide)
Build a WireGuard VPN server on Linux: keys, wg0.conf, NAT and firewall rules, client configs, and peer management.
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