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hardikghimire opened this issue May 18, 2025 · 1 comment
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print incorrect result while scanning using vpn #3112

hardikghimire opened this issue May 18, 2025 · 1 comment
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expected-behavior Behavior described is currently expected/documented, but that doesn't preclude improvements Nmap

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@hardikghimire
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i connect to vpn and scan ip , when nmap fetch result, it print all ports are open , i used --packet-trace -v -v , even there was synack SA response , and after i disconnect vpn and scan than only proper result appear
@nnposter nnposter added the expected-behavior Behavior described is currently expected/documented, but that doesn't preclude improvements label May 19, 2025
@nnposter
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In "raw" scan, if Nmap receives a SYN-ACK response to its TCP probe then it logically assumes that the port is open. One common situation where this might produce wrong results is with network devices that automatically respond to every SYN packet with a SYN-ACK as a defensive measure against SYN floods. Raw scan also might not work correctly with some VPN types in general.

Try to use "connect" scan, -sT instead.

@nnposter nnposter closed this as not planned Won't fix, can't repro, duplicate, stale May 21, 2025
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expected-behavior Behavior described is currently expected/documented, but that doesn't preclude improvements Nmap
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