Networknet notebook

Command-line snippets

Commands worth keeping close. Each snippet explains the flags and when the command helps.

Snippet gallery 3-second rotation

Networknet Snippet showing nc -zv ifconfig.io 443, a TCP connection check from Linux or Kubernetes, and correlation with firewall events and pcaps.
Check TCP/443 reachability with netcat

Networking

3 snippets
Command-line snippet Networking

Check TCP/443 reachability with netcat

How I use netcat from Linux VMs or Kubernetes pods to check TCP connectivity and correlate the result with firewall events and packet captures.

Command-line snippet Networking

Listen on TCP/443 with netcat

How I used a Linux netcat listener on TCP/443 to test remote connectivity and validate a ZTNA policy.

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Command-line snippet Networking

Discover your public egress IP

How I use curl over IPv4 and IPv6 to check the public address visible to a service through NAT, proxies or VPNs.