Link Layer Topology Discovery in Windows Vista consists of two components. The LLTD Mapper I/O component is the master module which controls the discovery process and generates the Network Map. Appropriate permissions for this may be configured with Group Policy settings. It can be allowed or disallowed for domains, and private and public networks. Is videopad free. Mar 25, 2013 The Link-Layer Topology Discovery Mapper service must be running. It may need to be started by an account with administrative privileges if the service is set to manual instead of automatic. RPC/DCOM (TCP port 135) must not be blocked by a software or hardware firewall.
The Link-Layer Topology Discovery (LLTD) is a component of the Windows networking implementation that allows computers and other devices to be represented on a map. Windows Vista, Windows Server 2008, and Windows 7 computers can natively populate the Network Map. This is visible in the Network and Sharing Center by selecting See Full Map.
Link Layer Topology Discovery (LLTD) is a proprietary link layer protocol for network topology discovery and quality of service diagnostics. Microsoft developed it as part of the Windows Rally set of technologies. The LLTD protocol operates over both wired (such as Ethernet (IEEE 802.3) or power line communication[1]) as well as wireless networks (such as IEEE 802.11).
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Link-Layer Topology Discovery Mapper - Windows 10 Service Creates a Network Map, consisting of PC and device topology (connectivity) information, and metadata describing each PC and device. If this service is disabled, the Network Map will not function properly. Jan 21, 2011 In the navigation pane, open the following folders: Local Computer Policy, Computer Configuration, Administrative Templates, Network, and Link-Layer Topology Discovery. In the details pane, double-click Turn on Mapper I/O (LLTDIO) driver. To disable the Mapper I/O component, click Disabled, and then click OK. The lltdio.sys (Link-Layer Topology Mapper I/O driver) file is a Windows driver. Generally, drivers are used by Windows to enable internal components like graphic cards and drives, or external devices, such as printers, backup media or input devices. Click here to check if you need to update your lltdio driver.
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LLTD is included in Windows Vista and Windows 7. It is used by their Network Map feature to display a graphical representation of the local area network (LAN) or wireless LAN (WLAN), to which the computer is connected. Windows XP does not contain the LLTD protocol as a standard component and as a result, Windows XP computers do not appear on the Network Map unless the LLTD responder is installed on Windows XP computers.[2] LLTD is available for download for 32-bit editions of Windows XP with Service Pack 2 (as a publicly released update)[3] and for Windows XP with Service Pack 3 (as a hotfix by request).[4] LLTD Responder was not released for Windows XP Professional x64 Edition. A 2006 fall update for the Xbox 360 enabled support for the LLTD protocol.[5]
Being a link layer (or OSI Layer 2) implementation, LLTD operates strictly on a given local network segment. It cannot discover devices across routers, an operation which would require Internet Protocol level routing.
Link Layer Topology Discovery in Windows Vista consists of two components. The LLTD Mapper I/O component is the master module which controls the discovery process and generates the Network Map. Appropriate permissions for this may be configured with Group Policy settings. It can be allowed or disallowed for domains, and private and public networks. The Mapper sends discovery command packets onto the local network segment via a raw network interface socket. The second component of LLTD are the LLTD Responders which answer Mapper requests about their host and possibly other discovered network information.
In addition to illustrating the layout of a network with representative icons for the hosts and interconnecting lines, each device icon may be explored to produce a popup information box summarizing important network and host parameters, such as MAC address and IP address (both IPv4 and IPv6). Icons are labeled with the hostnames (or first component of their fully qualified domain names), or a representative name of the function of the device, e.g., 'gateway'. If the device has reported the presence of a management Web interface, clicking on the icon will open a HTTP session to the host.
The LLTD responder for Windows XP only supports reporting of IPv4 addresses and not IPv6.
A royalty freeLinux sample implementation of the LLTD responder is available from Microsoft as part of the Windows Rally Development Kit. Using LLTD specifications requires signing a Microsoft Windows Rally license agreement.[6]
There also exists a Perl implementation, using Net::Frame, available via CPAN[7]
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