Chapter 14: Troubleshooting Hints
If you are running under TCP/IP, there are severalapplications that you can use to test the compatibility of the clientcomputer and server computer TCP/IP protocol stack. The ping utilityprovided with many TCP/IP packages is useful for testingthe IP network layer.
Using ping to testthe IP layer
Each IP layer has an associated address—a four-integerperiod-separated number (such as 191.72.109.12). Ping takesas an argument an IP address and attempts to send a single packetto the named IP protocol stack.
First, determine if your own protocol stack is operating correctlyby “pinging” your own computer. For example, ifyour IP address is 191.72.109.12, enter:
ping 191.72.109.12
at the command line prompt and wait to see if the packetsare routed at all. If they are, the output will appear similar tothe following:
c:> ping 191.72.109.12Pinging 191.72.109.12 with 32 bytes of data:Reply from 191.72.109.12: bytes=32 time<.10ms TTL=32Reply from 191.72.109.12: bytes=32 time<.10ms TTL=32Reply from 191.72.109.12: bytes=32 time<.10ms TTL=32...
If the ping works, then the computer is able to route packetsto itself. This is reasonable assurance that the IP layer is setup correctly. Ask someone else running TCP/IP for theirIP address and try pinging their computer.
Ensure that you can ping the computer running the databaseserver from the client computer before proceeding.
Using Telnet to test theTCP/IP stack
To further test the TCP/IP stack, start a serverapplication on one computer, and a client program on the other computer,and test whether they can communicate properly.
There are several applications commonly provided with TCP/IP implementationsthat can be used for this purpose. The following procedure showshow to use the telnet command to test the TCP/IPstack.
Start a Telnet serverprocess (or daemon) on one machine. Checkyour TCP/IP software documentation to see how to do this.For a typical command line Telnet program, type the following instructionat the command prompt:
telnetd
Start the Telnet client process on the other machine,and see if you get a connection. Again, check your TCP/IPsoftware documentation to see how to do this. For command line programs,you typically type the following instruction:
telnet server_name
where server_name is the nameor IP address of the computer running the Telnet server process.
If a Telnet connection is established between these two machines,the protocol stack is stable and the client and server should beable to communicate using the TCP/IP link between the twocomputers. If a Telnet connection cannot be established, there isa problem. You should ensure that your TCP/IP protocol stackis working correctly before proceeding.
FAQs
Using ping to test the IP layer
Ping takes as an argument an IP address and attempts to send a single packet to the named IP protocol stack. at the command line prompt and wait to see if the packets are routed at all. If they are, the output will appear similar to the following: c:> ping 191.72.
How do I test my TCP IP connection? ›
Testing TCP/IP using the command prompts
From a workstation, open a command prompt and type ping followed by the IP address of the interface you have configured.
What should the technician do to test the TCP IP stack? ›
The IP address 127.0. 0.1 is reserved for the loopback interface, which allows a host to send network packets to itself. By issuing a ping to this address, the technician can verify whether the TCP/IP stack is functioning properly on their own machine.
What command do you use to test the TCP IP stack on a computer choose two? ›
ipconfig: Displays current TCP/IP network configuration details including IP address, subnet mask, default gateway, and more. ping: Tests connectivity to another device on the network using ICMP packets.
What is the tool to test TCP? ›
iPerf - The ultimate speed test tool for TCP, UDP and SCTPTest the limits of your network + Internet neutrality test.
What is the IP address used for testing the TCP IP stack? ›
To verify that your workstation can receive and send responses, and that Cisco TCP/IP Suite is operating correctly, use Ping with the special loopback address 127.0. 0.1.
How to check TCP protocol? ›
On a Windows computer
Press the Windows key + R, then type "cmd.exe" and click OK. Enter "telnet + IP address or hostname + port number" (e.g., telnet www.example.com 1723 or telnet 10.17. xxx. xxx 5000) to run the telnet command in Command Prompt and test the TCP port status.
How to find IP stack? ›
Question: Find the configuration of the TCP/IP stack on your computer. If you are using Windows, you can do that with the command ipconfig /all at the Command Prompt (Command prompt is in the group Accessories). You can also open the window Control Panel ‐> Network connections ‐> TCP/IP.
How do I run an IP test? ›
For Windows 10, go to Search in the taskbar and:
- Type “cmd” to bring up the Command Prompt.
- Open the Command Prompt.
- Type “ping” in the black box and hit the space bar.
- Type the IP address you'd like to ping (e.g., 192.XXX.X.X).
- Review the ping results displayed.
Therefore, to test the IP stack on your local host, you need to ping the loopback address which is represented by the IP address 127.0. 0.1 or localhost.
TCP tests allow you to monitor whether or not low-level TCP connections can be established on the ports of given hosts, ensuring the availability of several key services such as SSH (22), SMTP (25), DNS (53), VPN over HTTPS (443), and any custom services living on other ports.
How do I fix a corrupt TCP/IP stack? ›
Follow these steps to use the reset command to reset TCP/IP manually:
- To open a command prompt, click Start and then click Run. ...
- At the command prompt, copy and paste (or type) the following command and then press ENTER: netsh int ip reset c:\resetlog. ...
- Reboot the computer.
Find Your TCP/IP Properties in Microsoft Windows 10
At the command prompt, type ipconfig /all and press Enter. Note the values that you see for the primary network adapter.
Which command should you use to verify that TCP/IP is correctly installed and configured on the local host? ›
Use the ping command with the remote system's TCP/IP address -- for example, ping 192.9. 200.1. If this is unsuccessful, the TCP/IP software is not properly installed and configured. TCP/IP must be working before you can use it.
What IP command would you use to test the entire IP stack? ›
The ipconfig /all switch will display the most complete listing of TCP/IP configuration information, also displaying the MAC address, DHCP lease times, and the DNS addresses.
How do you test the IP stack on your local host? ›
To test the IP stack on your local host, you need to ping the loopback address. The loopback address is a virtual IP address that is used to establish a connection between two applications or processes running on the same machine. The loopback address is represented by the IP address 127.0. 0.1 or localhost.
How do I know if my TCP is working? ›
Press the Windows key + R, then type "cmd.exe" and click OK. Enter "telnet + IP address or hostname + port number" (e.g., telnet www.example.com 1723 or telnet 10.17.xxx.xxx 5000) to run the telnet command in Command Prompt and test the TCP port status. If the port is open, only a cursor will show.
How do I know if TCP IP protocol is enabled? ›
Select the Windows Start button, then the Settings menu, and then the Control Panel from the Settings menu. Double click on the Network icon. Look in the top list box in the Configuration tab. If you do not see an entry that starts with TCP/IP then you have not installed TCP/IP.
