If
netbios_header is 4 bytes smaller or more than SMB_packet, it just blow !"Firewall is useless in this case. This is the part of the Server Message Block (SMB) which is a protocol of the Microsoft Windows Network to provide shared access to files and printers. There is no BSOD, just pull of the plug.
Read more at Laurent Gaffié Blog: Windows 7 / Server 2008R2 Remote Kernel Crash