Articles > Networking
Here is some information that you might want to save and refer to should you ever need it later when a problem arises.
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******************** Troubleshooting - TCP/IP General ********************
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How to troubleshoot TCP/IP connectivity with Windows XP
http://support.microsoft.com/kb/314067
Chapter 16 - Troubleshooting TCP/IP
http://technet.microsoft.com/en-us/library/bb727023.aspx
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***** Troubleshooting - TCP Ports Open/closed And/OR Firewalls ****
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How to Troubleshoot Basic TCP/IP Problems
http://support.microsoft.com/kb/169790
Use the Telnet tool to verify that the other computer is configured to permit connections on the same port you are using to connect. To do so, type the following line at a command prompt:
telnet <IP address> <port>
Where <IP address> is the IP address of the other computer and <port> is the port you are attempting to make a connection on. For example, if you are attempting to make an ftp connection to the other computer on port 21, type telnet <IP address> 21.
If you do not receive an error message, the other computer is configured to permit connections on that port. You should be able to make a connection using the appropriate service on that port.
Troubleshooting Windows Firewall settings in Windows XP Service Pack 2 for advanced users
http://support.microsoft.com/kb/875357 (shows how to figure out what TCP/IP port a process is using)
Linux Firewall (IPtables) Troubleshooting
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch14_:_Linux_Firewalls_Using_iptables
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******************** Troubleshooting - TCP Packets *****************************
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Basic Network Application Troubleshooting With Wireshark (Ethereal)
http://www.petri.co.il/wireshark-ethereal.htm
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**** Troubleshooting - DNS ******
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Nslookup Tutorial - Linux
http://www.debianhelp.co.uk/nslookup.htm
Nslookup Tutorial - Windows
http://www.windowsnetworking.com/articles_tutorials/Using-NSLOOKUP-DNS-Server-diagnosis.html
***** Bandwidth Testing *********
LAN Bandwidth testing:
https://publishing.ucf.edu/sites/itr/cst/Pages/IPerf.aspx
http://sourceforge.net/projects/iperf/
Internet Bandwidth Test:
http://www.speedtest.net/
http://www.dslreports.com/speedtest
**** SSH Client *******
http://www.chiark.greenend.org.uk/~sgtatham/putty/
Basic Network Troubleshooting for Windows and Linux
Last Updated: 1/24/11Here is some information that you might want to save and refer to should you ever need it later when a problem arises.
********************************************************************************
******************** Troubleshooting - TCP/IP General ********************
********************************************************************************
How to troubleshoot TCP/IP connectivity with Windows XP
http://support.microsoft.com/kb/314067
Chapter 16 - Troubleshooting TCP/IP
http://technet.microsoft.com/en-us/library/bb727023.aspx
********************************************************************************
***** Troubleshooting - TCP Ports Open/closed And/OR Firewalls ****
********************************************************************************
How to Troubleshoot Basic TCP/IP Problems
http://support.microsoft.com/kb/169790
Use the Telnet tool to verify that the other computer is configured to permit connections on the same port you are using to connect. To do so, type the following line at a command prompt:
telnet <IP address> <port>
Where <IP address> is the IP address of the other computer and <port> is the port you are attempting to make a connection on. For example, if you are attempting to make an ftp connection to the other computer on port 21, type telnet <IP address> 21.
If you do not receive an error message, the other computer is configured to permit connections on that port. You should be able to make a connection using the appropriate service on that port.
Troubleshooting Windows Firewall settings in Windows XP Service Pack 2 for advanced users
http://support.microsoft.com/kb/875357 (shows how to figure out what TCP/IP port a process is using)
Linux Firewall (IPtables) Troubleshooting
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch14_:_Linux_Firewalls_Using_iptables
********************************************************************************
******************** Troubleshooting - TCP Packets *****************************
********************************************************************************
Basic Network Application Troubleshooting With Wireshark (Ethereal)
http://www.petri.co.il/wireshark-ethereal.htm
****************************************
**** Troubleshooting - DNS ******
****************************************
Nslookup Tutorial - Linux
http://www.debianhelp.co.uk/nslookup.htm
Nslookup Tutorial - Windows
http://www.windowsnetworking.com/articles_tutorials/Using-NSLOOKUP-DNS-Server-diagnosis.html
***** Bandwidth Testing *********
LAN Bandwidth testing:
https://publishing.ucf.edu/sites/itr/cst/Pages/IPerf.aspx
http://sourceforge.net/projects/iperf/
Internet Bandwidth Test:
http://www.speedtest.net/
http://www.dslreports.com/speedtest
**** SSH Client *******
http://www.chiark.greenend.org.uk/~sgtatham/putty/
Keywords: network troubleshooting, basics of tcpip, windows, linux, firewall