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Document that IP proto scan has special cases for SCTP and IGMP as well
as TCP, UDP, and ICMP.
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@@ -1579,8 +1579,8 @@ improvements!</para>
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of iterating through the port number field of a UDP packet, it sends
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IP packet headers and iterates through the eight-bit IP protocol field.
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The headers are usually empty, containing no data and not even the
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proper header for the claimed protocol. The three exceptions are TCP,
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UDP, and ICMP. A proper protocol header for those is included since
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proper header for the claimed protocol. The exceptions are TCP,
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UDP, ICMP, SCTP, and IGMP. A proper protocol header for those is included since
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some systems won't send them otherwise and because Nmap already has
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functions to create them. Instead of watching for ICMP port
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unreachable messages, protocol scan is on the lookout for ICMP
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