LanHelper - Hainsoft.com
 Speed up your LAN management




 

How to scan network & gather network information

When using the remote administration tool for the first time, generally you should scan network to find IP and computer, get a computers list before performing other operations. The remote administration tool provides four functions, "Scan LAN", "Scan Domain", "Scan Workgroups" and "Scan IP", to perform scan operation. To manually add computer by name or by IP address one by one, using "Add Machine". To make the scan engine work better and gather more detailed network information, one should properly set security credentials options in Security Credentials dialog.

Scan Domain


Get computers list from domain controller through LDAP connection, and parse the computer information from the network. Acceptable addresses of domain controller are shown as below:

(1) LDAP://DC=domain, DC=net
(2) LDAP://www.domain.net
(3) LDAP://192.168.1.2
(4) LDAP://192.168.1.2/OU=ou1, DC=domain, DC=net

Display OU structure in Comment column
Use this option to identify one member computer's OU structure. To one member named "CN=PC1, OU=Child, OU=Parent, DC=Domain, DC=net", Comment column displays "OU=Parent, OU=Child".

Add member to XML group named with the OU name
If this option is turned on, the program will create XML Group for every member according to the OU structure. To one member named "CN=PC1, OU=Child, OU=Parent, DC=Domain, DC=net", it'll be added to one XML group named "Parent.Child". For more information of XML group, please refer to XML Group section in the help document.

Duplicate names: Reserve existed alive-status items
When searching and removing duplicate-names items from the list before adding one new item, the program will reserve the items with alive status (alive, !@, !@, *@, @*), and only remove the not-alive items. So users won't have to re-scan the whole list. This option can be set only when the scan option "Allow Duplicate Targets In The List" is turned off.

Scan Domain function use the security credentials user provided in this dialog, instead of the ones provided in Security Credentials dialog, to connect to member computers and gather network information.

Scan LAN

Scan local network.

Scan Workgroups


Select one or more workgroups to scan within local network.

Scan IP


In Scan IP dialog box, specify the ranges of IP address that you would like to scan in "IP Ranges" field. Click "C Class" or "B Class" radio button to automatically fill them according to local IP address. For example, the local IP address is w.x.y.z, then the IP ranges will be from w.x.y.0 to w.x.y.255 when click "C class", and be from w.x.0.0 to w.x.255.255 while click "B class". The options "Ping Timeout" and "Maximum Threads For IP Scanning" please refer to Options section in the help document.

When running the program under Windows XP without service pack 1 installed, you must set the threads number to 1 while scanning IP, otherwise you will get incorrect DNS name or NetBIOS name returned due to a bug of Windows XP system.

Skip ping
At present LanHelper sends ICMP echo request to target IP and wait for a reply to verify an IP to be active or be in use. This improves the efficiency and speed while scanning IP. But nowadays almost all the routers and the firewalls (including personal firewall programs) would filter or block the ICMP traffic, which has caused great difficulties for scanning IPs that behind router or firewall. This option helps Scan IP to find more secret targets, but it may greatly slow down the speed.


Scan Domain approach is recommended if you had domain controller.  You can also use Scan LAN and Scan Workgroups to scan targets on your LAN. If the targets are located on a different subnet such as virtual LAN or WAN, use Scan IP instead. If a computer has multiple network adapters installed, only the first one would be scanned.

Having a high speed in analyzing, Scan IP function is capable of scanning hundreds of IP addresses per second. Using the function you can scan LAN, virtual LAN and MAN, WAN. At presently LanHelper sends ICMP echo request to target IP to verify whether an IP is active or in use. This improves the efficiency and speed. But nowadays almost all the routers and the firewalls (including personal firewall programs) would filter or block the ICMP traffic, which has caused great difficulties for scanning IPs behind router or firewall. From version 1.20 on, an option "Skip Ping" was available, which helps to find more secret targets, but may greatly slow down the speed.

The returned computer data includes name (NetBIOS name or DNS name), IP address, MAC address, SNMP (system), workgroup name, logged-on user name, OS type, server type, comment, shared folders, shared printers, access property to the shared folders (writable, read-only or password protected), comment of the shared resource, etc.

If the remote administration tool LanHelper failed to get valid data from a target, the name may be shown as "(Unknown)", the IP address may be shown as "?.?.?.?" and the MAC address may be shown as "00-00-00-00-00-00".
 






  Copyright (C) 2012 Hainsoft.com. All Rights Reserved.