Skip to main content

DHCP superscope

DHCP superscopes is in simple terms a logical grouping of DHCP Scopes. They  are used in scenarios where there are multiple subnets created in a particular Vlan. In this case, your Vlan configuration would look like this:

Interface vlan 107
ip address
ip address secondary
ip address secondary

Create scopes for all the above subnets in your DHCP , then create a superscope and add the scopes to it.

The ideal case is to have one subnet per Vlan and to create individual scopes in DHCP for these Vlans. You will have to configure IP helper address for these Vlans and point them to your DHCP IP address so that the clients in various subnets get IPs from the DHCP. Your Vlan configuration would look like this (assume that the Ip of your DHCP is

vlan 12
interface vlan12 ip address
vlan 13
interface vlan13 ip address
ip helper-address
interface vlan14 ip address
ip helper-address

Here we have created a virtual interface (at layer 3), which can do inter-VLAN routing. DHCp requests for a Vlan received at the virtual interface is forwarded to the DHCP server, after changing the giaddr to the interface IP. DHCP when it receives the request, compares the subnet from the interface with the scopes configures. When it finds a match, the IP allocation process is initiated


Popular posts from this blog

Windows server 2012: where is my start button??

If you have been using Windows Server OS for a while, the one thing that will strike you most when you login to a Windows server 2012 is that there is no start button!!.. What??..How am I going to manage it?? Microsoft feels that you really dont need a start button, since you can do almost everything from your server  manager or even remotely from your desktop. After all the initial configurations are done, you could also do away with the GUI and go back to server core option.(In server 2012, there is an option to add and remove GUI). So does that mean, you need to learn to live without a start button. Actually no, the start button is very much there .Lets start looking for it. Option 1: There is "charms" bar on the side of your deskop, where you will find a "start" option. You can use the "Windows +C" shortcut to pop out the charms bar Option 2: There is a hidden "start area"in  the bottom left corner of your desktop

Use Diskpart to make drives online

Issue: In disk management, disk is shown as missing or Offline in Windows Resolution: The disks can be made online by using diskpart utility - Open a command prompt->type diskpart -Inorder to list the disks in the system type: list disk -Note down the number of the disk that you want to make online -Select that disk to operate upon, For eg:, if the disk number is 1, type: Select disk 1 -Now that particular disk will be selected as teh active disk. If you type "list disk" command once more, you can see a * symbol on the left side of the selected disk -Inorder to make the selected disk online type : online disk - If the disk is made online, you will get a message that the operation is completed successfully

Kubernetes best practices in Azure: AKS name space isolation and AAD integration

Once you have decided to run your workloads in AKS service in Azure, there are certain best practices to be followed during design and implementation. In this blog we will discuss two of these recommended practices and the practical aspects of their implementation- Azure AD integration and name space isolation While AAD helps to authenticate users to your AKS cluster using the existing users and groups in your Azure AD, name space isolation provides logical isolation of resources used by them. It is useful in multi tenant scenarios where the same cluster is being used by different teams/departments to run their workloads. It is also useful in running say a dev, test and QA environment for organization in the same cluster. Combining AAD integration with name spaces allow users to login to their namespace using their Azure AD credentials AAD integration with AKS : The following Microsoft document will get you started  with AAD integration of AKS cluster.: https://docs.microsof