bashLINUXipnetworkinterfaces
bash
ip -br addressA compact everyday networking view.
Linux Networking Admin Cheat Sheet
Comprehensive Linux networking administration reference covering iproute2, DNS, HTTP debugging, TLS, SSH tunnels, packet capture, and firewall inspection.
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Interfaces Routing and Addresses
Inspect and configure interfaces, routes, and gateways.
bashLINUXiproutenetwork
bash
ip route get 1.1.1.1Useful when policy routing or multiple interfaces are involved.
bashLINUXipnetworkinterface
bash
sudo ip link set dev eth0 upUseful in labs, VMs, and interface recovery steps.
bashLINUXipaddressnetwork
bash
sudo ip addr add 192.168.50.10/24 dev eth0Temporary until persisted through distro networking config.
bashLINUXiproutenetwork
bash
sudo ip route add 10.20.0.0/16 via 192.168.50.1Useful for lab environments and temporary routing changes.
bashLINUXiparpnetwork
bash
ip neigh showUseful for local-L2 reachability troubleshooting.
DNS HTTP and Remote Connectivity
Debug name resolution, HTTP, TLS, and remote host access.
bashLINUXdnsdigtrace
bash
dig +trace example.comUseful when debugging delegation or authoritative-server issues.
bashLINUXdnsdigmx
bash
dig +short MX example.comUseful for mail diagnostics.
bashLINUXcurlhttpdebug
bash
curl -v https://example.comGreat for debugging redirects, headers, TLS, and auth.
bashLINUXcurlapijson
bash
curl -X POST https://api.example.com/items -H 'Content-Type: application/json' -d '{"name":"demo"}'Useful for quick API testing without a GUI client.
bashLINUXopenssltlsnetwork
bash
openssl s_client -connect example.com:443 -servername example.comA go-to tool for TLS debugging and certificate inspection.
bashLINUXsshtunnelport-forward
bash
ssh -L 5433:127.0.0.1:5432 user@db-bastionUseful for securely reaching private services like databases.
bashLINUXsshkeysremote
bash
ssh-copy-id user@server.example.comSimplifies passwordless SSH setup.
Traffic Capture and Firewall Inspection
Capture packets and inspect firewall state.
bashLINUXtcpdumpcapturenetwork
bash
sudo tcpdump -i eth0Start broad, then add host, port, or protocol filters.
bashLINUXtcpdumpcapturenetwork
bash
sudo tcpdump -i any host 10.0.0.10 and port 443Useful for focusing on one problematic connection.
bashLINUXiptablesfirewallnetwork
bash
sudo iptables -L -n -vCommon on older systems and container hosts.
bashLINUXnftablesfirewallnetwork
bash
sudo nft list rulesetModern Linux firewall inspection on nft-based systems.
bashLINUXufwfirewallnetwork
bash
sudo ufw status verboseCommon on Ubuntu servers and personal Linux systems.
bashLINUXfirewalldfirewallnetwork
bash
sudo firewall-cmd --list-allUseful on RHEL-family systems that use firewalld.
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