Category: Network (LAN/WAN)

How to disable Tunnel/ISATAP Adapter?

There was an issue that whenever I ping a windows server, I was getting the response I was getting the response with IPV6 address. When checked on the source and destination, IPV6 was disabled. On detailed analysis found that the IPV6 was actually active on Tunnel adapter of the destination server.

Issue was fixed after disabling IPV6 from the Tunnel adapter on destination server by using the below command:

netsh int ipv6 isatap set state disabled
netsh int ipv6 6to4 set state disabled

You can also disable Teredo/isatap(Tunnel) adapter using the below command:

netsh interface teredo set state disable
netsh interface isatap state disable


Filed under: Network (LAN/WAN), Windows(2003/2008/2012)Tagged with: , , , , , , , , , ,

Change Network Card MAC Address in Windows

Steps to change the MAC address in Windows operating system.

1. Open the Network Connection using the command “ncpa.cpl” from RUN prompt.
2. Right-click on the NIC you want to change the MAC address and select properties.
3. Under “General” tab, click on the “Configure” button
4. Click on “Advanced” tab
5. Under “Property section”, you should see an item called “Network Address” or “Locally Administered Address”, click on it.
6. On the right side, under “Value”, type in the New MAC address without “-“.
7. Go to command prompt and type in “net config rdr” to verify the changes.
8. Reboot your system to succesfully complete the task.

Filed under: Network (LAN/WAN), Windows(2003/2008/2012)Tagged with: ,

Network Troubleshooting Tools in Windows Operating System

Windows contains an assortment of utilities you can use to diagnose, monitor, and repair network connections. Here’s an overview of the key tools you’ll find in Windows Operating System and what they’re used for.

Get MAC Address (Getmac.exe)
Discovers the Media Access Control (MAC) address, and lists associated network protocols for all network cards in a computer, either locally or across a network.

Hostname (Hostname.exe)
Displays the host name of the current computer.

IP Configuration Utility (Ipconfig.exe)
Displays all current TCP/IP network configuration values, and refreshes DHCP and DNS settings.

Name Server Lookup (Nslookup.exe)
Displays information about Domain Name System records for specific IP addresses and/or host names so that you can troubleshoot DNS problems.

Net services commands (Net.exe)
Performs a broad range of network tasks; type net with no parameters to see a full list of available command-line options.

Netstat (Netstat.exe)
Displays active TCP connections, ports on which the computer is listening, Ethernet statistics, the IP routing table, and IPv4/IPv6 statistics.

Network Command Shell (Netsh.exe)
Displays or modifies the network configuration of a local or remote computer that is currently running; this command-line scripting utility has a huge number of options, which are fully detailed in Help.

PathPing (Pathping.exe)
Combines functions of Traceroute and Ping to identify problems at a router or network link.

TCP/IP NetBIOS Information (Nbtstat.exe)
Displays statistics for NetBIOS over TCP/IP (NetBT) protocol, NetBIOS name tables for both the local computer and remote computers, and the NetBIOS name cache.

TCP/IP Ping (Ping.exe)
Verifies IP-level connectivity to another internet address by sending ICMP packets and measuring response time in milliseconds.

TCP/IP Route (Route.exe)
Displays and modifies entries in the local IP routing table.

TCP/IP Traceroute (Tracert.exe)
Determines the path to an internet address and lists the time required to reach each hop; useful for troubleshooting connectivity problems on specific network segments.

Filed under: Network (LAN/WAN), Windows(2003/2008/2012)Tagged with: , , , , , , , , , , , ,

What is the difference between TCP and UDP?

TCP is a connection oriented protocol, which means that everytime a packet is sent say from host A to B, we will get an acknowledgement. Whereas UDP on the other hand, is a connection less protocol.

Where will it be used : TCP -> Say you have a file transfer and you need to ensure that the file reaches intact, and time is not a factor, in such a case we can use TCP.

UDP-> Media Streaming, question is say you are watching a movie…would you prefer that your movie comes..perfectly….but u need to wait a long time before you see the next frame ?..or would you prefer the movie to keep streaming…Yes…The second option is definely better….This is when we need UDP

Filed under: Network (LAN/WAN)Tagged with: , ,

What is ARP/RARP?

ARP: Stands for Address Resolution Protocol…whenever a request is sent by a node on one network to the node on another network the Physical address(MAC) is required and for this the IP address need to be flow over the network..whenver a router with that network (IP) gets the msg. the required MAC address is sent through the network this process of converting the IP address to MAC address is Called ARP..and the reverse thats the convertion of the Mac address to the IP address is called RARP ( Reverse Address Resolution Protocol)

Filed under: Network (LAN/WAN)Tagged with: , ,