Browser service without WINS across subnets
(This was Updated 1/2012 to reflect Windows 7 & Windows 2008 R2 changes)Ģ. NetBIOS and Hostname resolution for Microsoft Client and LAN Manager 2.2c Client: Hostname Resolution – Describes DNS domain name resolution The following two images are quoted from: The following information was quoted from:Ĭonfiguring IP Addressing and Name Resolution How NetBIOS name resolution really works, By Robert L. DirectSMB uses TCP 445… Direct-hosted SMB’s cannot be disabled in Windows without disabling additional features…Īpplies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2 Since Direct Hosting is not reliant on NetBIOS, NetBIOS over TCP/IP can be disabled and connectivity to resources via SMB is still possible to other machines, with the only caveat with legacy apps that rely on NetBIOS.”ĭirect hosting of SMB over TCP/IPRemoving WINS and NetBIOS broadcast as a means of name resolution. And Direct Hosting of SMB over TCP uses TCP port 445. If we disabled the NetBIOS over TCP/IP, the SMB connectivity was interrupted.Īt Windows 2000 and higher version, the OS support both NetBIOS sessions and Direct Hosting. This means that all SMB traffic will start after NetBIOS session is established. “Previous to Windows2000, Microsoft OS could only use SMB over a NetBIOS session. TechNet Thread question: “ Netbios Session Service and SMB” Quoted from Aiden Cao, MIcrosoft, in thread: This allows Windows to function properly with operating systems that do not support direct hosting of SMB traffic. If both the direct hosted and NBT interfaces are enabled, both methods are tried at the same time and the first to respond is used. If NetBIOS is disabled, which only disabled the NBT transport and interface, TCP will still use DirectSMB (also called Direct Hosted SMB) in Windows 2000 or newer. Is name longer than 15 characters? If so, perform Hostname (DNS) resolution process.Prior to Windows 2000 (ME, 95, DOS, 3.1, etc), NetBIOS was tried first, essentially if using WINS: Windows 2000 and newer – If not using WINS: DNS (this is where the search suffix comes in play if a single name query).Local hostname (DNS client side resolver) cache.Windows 2000 and newer, hostname (DNS or hosts file) resolution is used first before NetBIOS (WINS enabled)
H-Node – Mixed NBNS and Broadcast, but uses WINS FIRST. M-Node- Mixed NBNS and Broadcast, but uses Broadcast FIRST. P-Node – NBNS (Netbios Nameserver) or WINS ONLY H-Node is default, but the order can be changed with a registry change. If you are using an NBNS (NetBIOS Nameserver, such as WINS), that changes it a bit, and it also depends on what Node it’s in. If is is shorter than 15, then it will use NetBIOS, but if it doesn’t get resolved using NetBIOS, only then will it use the DNS hostname resolution process. Legacy pre-Windows 2000 clients, such as Windows NT, Windows 98, Windows 95, Windows 3.1, DOS, etc, use the NetBIOS process FIRST if the queried name is less than 15 characters, and if not, it uses hostname (DNS) resolution. If it does not get resolved using the DNS process, then it uses the NetBIOS process. Keep in mind, Win2000 and newer machines uses the DNS (hostname) process FIRST before the NetBIOS resolution process. How does resolution work in a multi-domain forest (with child domains)?.Client side DNS Devolution on Windows 7 and Windows 2008 R2 has Changed.What happens with Exchange and Outlook when when DNS goes down?.If one DC or DNS is down, why can’t I logon to the other DC or not use the second DNS address to find another DC?.DNS Forwarder Resolution and Time Out Process.DNS Client side Resolver service Query Process.Browser service without WINS across subnets.I know everyone always has trouble with this topic, as in why doesn’t DNS failover on the client, especially that I set four or five DNS addresses on it? Why!!!īecause it doesn’t work that way! And NO, it’s not a “Microsoft” client thing or server thing, it’s based on the client side resolver service defined as an industry standard that all manufacturer’s (Microsoft, Apple, Unix flavors, Android, etc) operating systems follow, including your phone.