Help: Newbie question of protocols on ports 139 and 445

Hi,

I have been reading the RFCs and some articles about protocols on
NetBIOS and CIFS (known as SMB). As far as I understand, NetBIOS name
service, sessions and datagram protocols are listening on ports 137,
138 and 139. For any communications to Windows 9X/NT and before,
NetBIOS protocol is used which is the 13[7-9] ports.
Assumes a NetBIOS session is established and the CIFS
authentication is succeeded. When a file transfer starts, the USER_DATA
portion inside the session message packet (according to section 4.3.6
in RFC 1002) is the CIFS packet with command field, SMB_COM_READ_ANDX
(0x2E). Is that right? Please feel free to comment.

I also read other articles saying that any communications between
Window XP and 2000, NetBIOS is not used. Instead, microsoft-ds protocol
is used on port 445. What is this microsoft-ds protocol? Is it just
CIFS over TCP/UDP? I cannot find any RFC or any document describing the
format of the protocol. Please can anyone point me to the right
direction.

Many thanks
Joe

.

Relevant Pages

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