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.
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
(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 local network.
Select one or more workgroups to scan within local network.
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
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.
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".