Nmap displaying scan results twice in IPv6 mode?

[Jacek Wielemborek <d33tah () gmail com>]

List,

Why is Nmap behaving like this?

> $ nmap -6 localhost ::1 -sT
>
> Starting Nmap 6.45 ( http://nmap.org ) at 2014-06-30 13:04 CEST
> Nmap scan report for localhost (::1)
> Host is up (0.0013s latency).
> Not shown: 997 closed ports
> PORT    STATE SERVICE
> 22/tcp  open  ssh
> 111/tcp open  rpcbind
> 631/tcp open  ipp
>
> Nmap scan report for localhost (::1)
> Host is up (0.0012s latency).
> Not shown: 997 closed ports
> PORT    STATE SERVICE
> 22/tcp  open  ssh
> 111/tcp open  rpcbind
> 631/tcp open  ipp
>
> Nmap done: 2 IP addresses (2 hosts up) scanned in 0.17 seconds

Compare this with:

> $ nmap localhost -sT 
>
> Starting Nmap 6.45 ( http://nmap.org ) at 2014-06-30 13:04 CEST
> Nmap scan report for localhost (127.0.0.1)
> Host is up (0.0011s latency).
> Other addresses for localhost (not scanned): 127.0.0.1
> Not shown: 997 closed ports
> PORT    STATE SERVICE
> 22/tcp  open  ssh
> 111/tcp open  rpcbind
> 631/tcp open  ipp
>
> Nmap done: 1 IP address (1 host up) scanned in 0.11 seconds

Tested on Fedora 20.

Yours,
Jacek Wielemborek

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