Echo Request — protocol payload
Analyze the supplied ICMP request transcript and identify the exact payload marker expected by the echo responder.
ICMP TRANSCRIPT
request type: echo
payload marker: protocol-payload
response: accepted only when the expected marker is present
Attribution: Adapted from Crate-CTF, 2025 challenge “Echo Request” by larshson. Used under the MIT License; flags and secrets were replaced for GisVuln. See source and license details.
This GisVuln adaptation is self-contained and does not contact the original challenge infrastructure.