Bug in nmap -PO, Protocol Ping scan type?

[i2n2 <i2n2 () telia com>]

Hi,

OK, I'm new to the filed of network scanning so it can be a 
misunderstanding when reading the man page for nmap but...

The "Scan Type" -PO doesn’t do an IP Protocol Ping. It looks like it's 
doing a default SYN Stealth Scan on 1000 tcp ports ("Scan Type" -sS).

The "Scan Type" -sO do an IP Protocol Ping as expected.



I find the same "bug" on two tested system.

OS X 10.11.6 (15G1108)
Nmap version 7.31

Linux 3.18.0-trunk-rpi #1 PREEMPT Debian 3.18.5-1~exp1+rpi19 
(2015-08-08) armv6l GNU/Linux
Nmap version 6.00


The test commands that convinced me that it can be a bug (Probably only 
in the parse_options function in nmap.cc? )


# sudo nmap -v -PO 192.168.0.1
# sudo nmap -v -sS 192.168.0.1
# sudo nmap -v -sO -p1,2,4 192.168.0.1

/ i2n2
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