Mapping network drives with limited protocols/services

What protocol/service if any is required when mapping network drives? I'm running a software-based firewall to...

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separate my two network segments and wish to better secure my network by only allowing those service needed to access computers on lets say segment_B. I'm currently allowing ICMP, UDP, TCP, FTP and RDP request through the firewall. If I set the security rule to allow for any service, mapping a drive from one netork to the next is not problem.

Microsoft site

Windows 2000 is a different animal if using the new features and not older NT 4.0 features. Direct hosted "NetBIOS-less" SMB traffic uses port 445 (TCP and UDP). In this situation, a four-byte header precedes the SMB traffic. The first byte of this header is always 0x00, and the next three bytes are the length of the remaining data.

This is obvious. Microsoft no longer will support them.

What is NetBIOS?
Determining which TCP/IP services are needed
Infrastructure and Network Security

Is there a site I could go to that might assist me in knowing what protocol/service controls which communication request? As found on the , NT 4.0 used: NetBIOS over TCP traditionally with the following ports: nbname 137/UDP nbname 137/TCP nbdatagram 138/UDP nbsession 139/TCP Finally, I think the answer is found in if you are using NetBIOS over TCP (ports 137, 138 and 139) or the newer NetBIOS-less SMB traffic over port 445 (TCP & UDP). Fair warning any of the following will not work with a Win 2000 server unless running the following in legacy mode: IBM OS/2 1.3 Lan Manager 2.2 Microsoft Net Server 1.11 Hewlett-Packard Unix Lan Manager X For more information on this topic, visit these other SearchSecurity.com resources: Ask the Expert: Ask the Expert: Best Web Links:

This was last published in December 2002

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