1. NBTSCAN

root@bt:~# nbtscan -r 10.0.2.0/24
Doing NBT name scan for addresses from 10.0.2.0/24

IP address NetBIOS Name Server User MAC address
------------------------------------------------------------------------------
10.0.2.0 Sendto failed: Permission denied
10.0.2.10 <unknown> <unknown>
10.0.2.15 METASPLOITABLE <server> METASPLOITABLE 00-00-00-00-00-00
10.0.2.18 TEST01 <server> TEST01 00-11-21-22-1d-4d
10.0.2.45 TEST04 <server> TEST04 00-12-d2-34-11-55

2. NMAP

nmap -p 1-65535 -T4 -O -A -v 10.0.2.15

3. SMBCLIENT

root@bt:~# smbclient -L=10.0.2.15

Null Sessions

root@bt:~# smbclient \\\\10.0.2.15\\tmp
Enter root's password:
Anonymous login successful


SMB Enumeration Techniques using Windows Tools:

1. NetBIOS Enumerator (nbtenum)

http://nbtenum.sourceforge.net/