Will you allow NetBIOS into your DMZ?
No. Typically you don't want your servers where they trust any other systems because that means they could compromise the DMZ server and tunnel using that trusted relationship. That means no domains, etc. Therefore, NetBIOS is not exactly useful since there are no trusts. Also, by the very nature of a system being in a DMZ the recommendation is:
- Uninstall what you don't need
- Disable it if you can't uninstall it
This goes for services, users, protocols, etc. Therefore, NetBIOS usually gets struck pretty quick.