Skip to main content

Identify other end PC...or OS!!!

IP packet contains n number of information within. One important protocol is TTL i.e. Time To Live.
It is an eight-bit field helps prevent datagrams from persisting (e.g. going in circles) on an internet. This field limits a datagram's lifetime. It is specified in seconds, but time intervals less than 1 second are rounded up to 1. In latencies typical in practice, it has come to be a hop count field. Each packet switch (or router) that a datagram crosses decrements the TTL field by one. When the TTL field hits zero, the packet is no longer forwarded by a packet switch and is discarded. Typically, an ICMP message is sent back to the sender that it has been discarded.
In addition to that there is a good reason to use this field, i.e. for identifying the other end PC, device or OS.
How? Lets check:
goto command prompt (in linux goto terminal)
and use ping command to identify the availability of other end device.
You will find :
Here you can see the TTL (highlighted) value is 30 the end pc or device or os is windows NT machine. Its range could be 28 to 32. Similarly for linux machine (open source machines) it would be 62-64, for windows (windows machines) 126-128. For routers it would be 255-256.
You can also check this with following list.

OS/Device Version Protocol TTL value
AIX 3.2, 4.1 ICMP 255
BSDI BSD/OS 3.1 and 4.0 ICMP 255
Cisco ICMP 254
Juniper ICMP 64
Linux 2.0.x kernel ICMP 64
Linux 2.2.14 kernel ICMP 255
Linux 2.4 kernel ICMP 255
Linux Red Hat 9 ICMP and TCP 64
Solaris 2.5.1, 2.6, 2.7, 2.8 ICMP/TCP 255/64
SunOS 5.7 ICMP and TCP 255
Windows for Workgroups TCP and UDP 32
Windows 95 TCP and UDP 32
Windows 98 ICMP/TCP 128
Windows NT 4.0 TCP and UDP 128
Windows Server 2003 128
Windows XP ICMP/TCP/UDP 128


  1. PC has different issue related to different software installed in it. Operating system is as important for the user and its main advantages are often explained very well to rush my essay through a person may judge the real uses of PC but PC is nothing without operating system as OS is like its important part required to be executed. Software matters a lot for hardware.


Post a Comment

Popular posts from this blog

SharePoint WebPart Error - Unable to add selected web part (s) – MOSS 2007

ISSUE: Recently I faced this issue that when I try to deploy my WebPart.  Unable to add selected web part(s). WebPartName: Cannon unregister UpdatePanel with ID ‘ctl00RTMPanel’ since it was not registerd with the ScripManager. This might occure if the UpdatePanel was removed from the control tree and later added again, which is not supported. Parameter name: updatePanel.   I faced this issue twice and both the time the issue was not what display here. This could be sure to any error in the WebPart. Following are list resolution from multiple instances.   RESOLUTION: 1. Check the WebPartName.webpart file. Check whether you have a proper PublicKeyToken value. When I face the issue the value was PublicKeyToken=$PublicKeyToken$. If you have used WSP builder then in the Visual Studio you will find this file at \WebPartsProject\12\TEMPLATE\FEATURES\WebPartName\WebPartName.webpart. Sometime when you create a new WebPart using WSP builder then you do not get

My Grandparents – Grand Parents Day Essay Competition Winner

Vedic won the Grand Parents Day Essay Competition at HSCF New Age Sr. Group function. There were 27 participants in his category (Elementary School Category) and he won 1st price.Full list of winners are available at . Video of Vedic reading his essay after winning: My Grandparents – Grand Parents Day Essay Competition Winner from Laksha on Vimeo . Below is the script of his Essay: My Grandparents I have three grandparents, my “dada ji, dadi ji and nani ji”. My grandparents live in India. Sometime I go to India and stay with them. My dada ji is a homeopathic doctor. Whenever I get sick he gives me sweet medicine. I love my dada ji because my dada ji take me out for a walk and always play with me. And whenever we go for a walk my dada ji tells me stories. My grand ma takes me to temple. She even played with me and made food for me. My nani ji sing “Bhajans” everyday. She play with me and take me

How To Create Virtual Machine Using Existing vmdk file in VMWare Workstation

vmdk file is hard disk of the VMWare virtual machine. There are many scenarios where you may need to create a new virtual machine for an existing vmdk file. This is also an alternate Method to the “ vmx is not a valid virtual machine configuration file – Could not open virtual machine ” issue. Please refer to the previous post “ Could not open virtual machine – vmx is not a valid virtual machine configuration file ” for a full list of possible resolution. This post is to describe one of the solution in more details. How To Create a new virtual machine & attach the existing .vmdk file: 1. Open VMware and select create a new virtual machine with custom (advanced) configuration option. 2. Chose “I will install the operating system later”. and chose “I will install the operating system later”. 3. Select the operating system that matches the operating system in your existing .vldk file. 4. Select a location of the new virtual machine 5. Chose “Use an exis