Disconnect or terminate an Airtel postpaid connection

I was using an Airtel 4G dongle and decided to disconnect. There was nothing wrong with the Airtel service, the reason to disconnect was very simple availability of cheaper wireless services from JIO.

Now I had already ported my primary mobile number to JIO, so it no longer necessary to have a separate 4G dongle connection for internet access. Around 2014, when I bought this Airtel 4G connection, there was no JIO hence Airtel 4G was the best option back then. Today with JIO around its a different story altogether.

So finally, I decided to terminate my Airtel 4G connection. However the hurdle that I faced was not straight forward information available online to process the termination request from home. And that is the reason I am writing this blog. May be someone may find this information useful.

So process the disconnection request online and to avoid going to the Airtel Store, here is what you need do:

  1. Send a postpaid connection termination request to Airtel at 121@in.airtel.com
  2. Call the Helpline number and file a request for termination. The helpline number is 1800-103-0405

Now technically any one of the above steps is enough but you just want to be doubly sure, hence log the request using both mechanisms.

On completing the above 2 steps, you will receive a call from the Airtel help desk, asking for a reason why you want to disconnect and they may propose you some alternate plan to keep you within the network. You have already done your home work and you have decided to terminate the services, so don’t fall for the trap and stick to your decision of terminating the services.

Here is a sample request letter for terminating the connection:


I would request you to permanently disconnect/terminate and discontinue my existing AIRTEL 4G connection as I no longer require these services. This is for your kind information and necessary action.

My connections details are mentioned below:

Customer Relationship Number:
Mobile Number:

Request you to accept this request and acknowledge the same. I am also attaching a scanned letter request for your perusal.

Please terminate all 4G and mobile services from today!

Yours Sincerely,
<Your Name>


  1. Remember to initiate this termination (disconnection) request from the same email address on which you receive your online bill.
  2. When you initiate this request all postpaid services will stop from the next billing cycle.
  3. You may receive one last bill for final settlement. Pay this bill. It is your legal and financial responsibility to pay the final settlement bill. Not paying the final settlement bill will impact you CIBIL score.

Powercli oneliner for changing MTU to 9000

I wanted to set MTU on number of standard vSwitches across multiple ESXi hosts and Powercli made that job easier. Here’s a oneliner to get the job done across multiple vSwitches.

Get-VMHost My-ESXi-Host| Get-VirtualPortGroup "PG_SearchString*" | Get-VirtualSwitch | Set-VirtualSwitch -Mtu 9000 -Confirm:$false



Mounting a USB Drive in FreeBSD

Search for NTFS package

pkg search ntfs

Install NTFS packages

pkg install fusefs-ntfs-2014.2.15_2

Read through basic instructions

less /usr/local/share/doc/ntfs-3g/README.FreeBSD

Link the NTFS mount binary

ln -s `which ntfs-3g` /usr/sbin/mount_ntfs-3g

Enable FuseFS in /etc/rc.conf

echo '' >> /etc/rc.conf
echo '# Enable fusefs support required for ntfs-3g' >> /etc/rc.conf
echo 'fusefs_enable="YES"' >> /etc/rc.conf
echo '' >> /etc/rc.conf

Connect the USB drive and search for your USB drive in the discovered disks

dmesg | grep -i da

Inspect the disk partitions on the USB drive

fdisk /dev/da10

Create a mount point

mkdir /media/usb-hdd

Mount the USB partition

mount_ntfs-3g -o ro /dev/da8s1 /media/usb-hdd

Verify the disk contents

ls -alR /media/usb-hdd

Comparison between SATA and SAS HDD connector

Like different SATA connectors (SATA1, SATA2 & SATA3) the SAS connectors are compatible. So a SAS1 HDD can be connect to a SAS2 port and SAS2 HDD can be connect to a SAS1 port. This is a connector compatibility, without the speed improvements.

Additional thing to remember is SAS connectors, because of the way the connectors are constructed, SAS connectors are compatible with SATA HDDs. It is part of the SAS specification. a SAS connector can take a SATA drive, but a SATA cable cannot take a SAS drive. A SAS connector can connect to SATA HDD, but a SATA connector cannot connector to a SAS HDD.

Refer to the picture shown below for a pictorial comparison between the 2 connectors types.


Additional Reference:
SAS/SATA Compatibility Simplifies Storage by Design

A Salute to “The Master Blaster”

Who is not a fan of “The Master Blaster” on this side of the world. And what an illustrious career he has had. Yes I am writing about one and only SRT: “Sachin Ramesh Tendulkar”.

The ongoing test against West Indies his 200th and the last, where he will wear the India cap. He has already said goodbye to the ODI. And I am sad that I will not be able to watch him bat again for India. I feel all the more sad that, in the last 24 years I never went to watch him in action in “live” on a Stadium.

Great talent with greater hard work & dedication. He has been an inspiration. A great player, a soft spoken and a very humble human being.

What else can I say, SACHINCREDIBLE.

Some quotes about Sachin by the foreign media.

FreeBSD slices and partitions

Although I have worked with various Unices over the last few years. However there was a time when I was confused the the partitioning scheme in Unix. Based on some of my earlier notes, for my benefit ;-), FreeBSD partitions explained:

Straight from The Linux+FreeBSD mini-howto:

FreeBSD needs one of the four entries in the partition table on your PC’s hard drive. This primary partition is called a ‘slice’ in FreeBSD terminology. It then uses the disklabel program to make up to eight partitions in this primary partition. These logical partitions are called ‘partitions’ in FreeBSD terminology.

From the FreeBSD handbook:

A disk can have up to eight partitions, labeled a-h.

Partition ‘a‘ normally contains the root file system (/). Typically there would be only one disk with the ‘a’ partition.

Partition ‘b‘ is used for swap. Multiple disks can contain swap partitions.

Partition ‘c‘ is used to address the entire disk in dedicated mode, or the entire FreeBSD slice in slice mode. Typically useful for debugging and troubleshooting (say a bad block scanner). You would never want to create a file system on this partition.

Partition ‘d‘ used to have a special meaning associated with it, although that is now gone and d may work as any normal partition.

Thus partitions ‘d’, ‘e’, ‘f’, ‘i’ & ‘h’ can be used for any general purpose.

I guess the disk layout diagram from the FreeBSD handbook would make things clear!

FreeBSD disk layout

PowerShell Goodness

I have been a Perl user for years now. And hence I was a bit slow and probably less than willing to learn PowerShell. However over the last couple of years I have seen the popularity of rising and VMware also ships a very cool PSSnapin called as PowerCLI, hence decided take up learning PowerShell.

However I have to admit the learning experience was very pleasant and I was bowled over by all the goodness PowerShell. The PSSnapin being shipped by VMware is also equally great. Crossing over from Perl I found learning PowerShell to be very easy. In the last 1 month I have ended up re-writing some of my Perl scripts in PowerCLI.