IPv6 host discovery Bug in 6.47 -- perhaps newer versions

[Allen Landsidel <landsidel.allen () gmail com>]

It appears that when scanning a host with ipv6, if you don't specify any 
discovery options, that only the port 80 and port 443 checks described 
in the man page are actually tried -- the ICMP echo request isn't. 
Scanning with "nmap -6 -PE host::addr" works fine and detects the host 
is up, but scanning with just "nmap -6 host::addr" does not.

Tcpdump indicates only the 80 and 443 packets are being sent, while the 
man page indicates the ICMP echo request is also tried.

Using FreeBSD, so I don't know if this is fixed in 6.48 or 6.49, as 6.47 
is the latest version available in ports.

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