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Make clear the local host limitation #286

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3 changes: 2 additions & 1 deletion README.md
Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,8 @@ ranges and port ranges.
NOTE: masscan uses a **custom TCP/IP stack**. Anything other than simple port
scans will cause conflict with the local TCP/IP stack. This means you need to
either use the `-S` option to use a separate IP address, or configure your
operating system to firewall the ports that masscan uses.
operating system to firewall the ports that masscan uses. Because
masscan uses a custom stack, it cannot scan the local host.

This tool is free, but consider funding it here:
1MASSCANaHUiyTtR3bJ2sLGuMw5kDBaj4T
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