Snort alerts

[Pildesapo2 via Snort-sigs <snort-sigs () lists snort org>]

Hello,

Currently I am trying to setup Snort 2.9.11. The problem is that snort is not detecting any nmap scans nor metasploit 
attacks. Adding a simple ICMP rule works though. Both community and registered rulesets are added and loaded into Snort.

Setup:
Virtualbox environment (1 attack VM, 1 victim VM) with snort on the host machine, listening on vboxnet4 on which the 
victim VM receives nmap and metasploit attacks.

Snort start command:
$ sudo snort -c /etc/snort/snort.conf -l /var/log/snort/test5 -A full -i vboxnet4 -k none -de

My question is: why aren't any alerts triggered on the nmap or metasploit attacks.

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