Networknet notebook

Troubleshooting

Command-line snippetNetworking

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 snippetNetworking

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.

Command-line snippetNetworking

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.