CIDR Calc

Packet Path Triage

A guided flow for diagnosing connectivity issues without guesswork.

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Basic reachability

Can you resolve DNS and ping the target?

Routing and gateway

Do traceroute hops progress past your default gateway?

Firewall / ACLs

Are inbound and outbound rules allowing this traffic?

TLS or port-specific checks

If ping works, does the target port respond?

MTU / fragmentation

Do large requests stall or fail with DF set?

Guidance

Next action

Start with DNS and ICMP reachability.
Tip: capture timestamps with each test to correlate logs and firewall events.