Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
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Network Analysis - IPv4 Overlapping Fragment Reassembly
Mission
The UDP datagram with IPv4 ID 0xbeef in fragments.pcap contains overlapping fragments that overwrite earlier bytes. Reassemble it using last-arriving bytes, then recover the flag from the Base64 data in the UDP payload.
Hints
Hint 1 Show
IPv4 fragment offsets are in 8-byte units; focus on Identification 0xbeef
Hint 2 Show
Write fragments into a reassembly buffer in capture order so later data overwrites overlaps
Hint 3 Show
Remove the 8-byte UDP header and PAYLOAD= prefix, then Base64-decode