Linux ACL Tutorial
Written by A.Jesin Sunday, 9 October 2011 02:46
Access Control Lists( (ACLs) are a way to assign fine tuned permissions in Linux apart from using the chmod command. When the chmod command is used only one owner and one group can be assigned permissions on a file or directory. If multiple users need access to a resource we need to place them in a group and then give that group the necessary permissions. But with File ACLs in Linux we can assign fine grained permissions to each user and group on a file and even deny access to a particular user even if the file has world permissions. This tutorial on Linux File ACL will explain the usage of the commands getfacl and setfacl. Read More…
Configure Inter-VLAN routing on Cisco Router
Written by A.Jesin Wednesday, 5 October 2011 03:34
This tutorial explains how to configure InterVLAN routing on Cisco routers. InterVLAN routing allows communication between Virtual LANs. The first part of the tutorial explains how to configure VLAN on the switch and the second part explains how to configure InterVLAN routing on a router.
The following is the connectivity of the switch
fastEthernet 0/1 - Router
fastEthernet 1/1 (VLAN 2) - PC0
fastEthernet 2/1 (VLAN 2) - PC1
fastEthernet 3/1 (VLAN 3) - PC2
fastEthernet 4/1 (VLAN 3) - PC3
fastEthernet 5/1 (VLAN 4) - PC4
fastEthernet 6/1 (VLAN 4) - PC5
The image below shows the topology of the network. Read More…
How to set the time in Cisco devices
Written by A.Jesin Monday, 3 October 2011 01:37
A quickie explaining how to set the clock in Cisco routers and switches. Setting the correct time is important when logging the activities of a Cisco device. To display date and time use the following command in privileged mode
R1#show clock
To set the correct time enter the following command in privileged mode
R1#clock set hh:mm:ss MONTH <Day of the month> <Year>
Example
R1#clock set 13:35:00 oct 3 2011
How to prestage a computer in Active Directory
Written by A.Jesin Wednesday, 28 September 2011 10:58
This tutorial explains prestaging a computer object in the Windows Active Directory database. Prestaging means to add a computer to the Active Directory database before joining the computer to the domain. By prestaging a computer you can make sure the WDS (Windows Deployment Services) server responds only to known computers. By default if you join a computer to a domain the computer object is created in the Computers container, even though you can move it to another container later, by prestaging you can place the computer inside the container of your choice even before joining it to the domain. Read More…
Installing ADSI edit in Windows Server 2003
Written by A.Jesin Monday, 26 September 2011 08:41
The ADSI (Active Directory Service Interfaces) editor is a management console that comes along with the Windows Server support tools. Using this you can edit each and every attribute of the objects present in your active directory database. The support tools for the Windows Server OS is present in the OS installation CD. It is located at
[CDDRIVE]:\SUPPORT\TOOLS\SUPTOOLS.MSI
If you don’t have the OS CD you can download it from Microsoft
After installation got to Start -> Run and type adsiedit.msc to get the ADSI edit console. If you get an error message saying adsiedit.msc is not found you have to register the DLL file required for it manually. To do this go to Start-> Run and type regsvr32 adsiedit.dll.
Happy Tweaking ! :-)
Hide Last Logged in Username in Windows (Security Policy)
Written by A.Jesin Sunday, 25 September 2011 08:21
This tutorial will show you how to hide the last logged in Username in Windows by editing a security policy. But you’d have seen a similar article Hide Last Logged in Username in Windows, this article will describe how to do the same by editing the windows registry. This tutorial will be useful when applying this setting as a policy in a domain environment, but this can also be done on a normal workgroup environment using the secpol.msc command.
Go to Start -> Run or [Windows Key] + R and type secpol.msc, the “Local Security Policy” Window opens. Navigate to Local Policies -> Security Options and look for the policy “Interactive logon: Do not display last user name” and change it to enabled. To apply the changes immediately go to Run and type gpupdate.
