If all of the above test fails contact remote IDC staff. I recommend you to read tcpdump recipes for more information. Read man page of tcpdump for more examples and usage. For example to print all packets arriving at router, use: They can watch routing, client and server communication, packets and much more.įor detailed usage please refer to official documentation tcpdump These tools are commonly known as a network protocol analyzer. #8 Network analysisīesides above tools you must use network analysis tools such as Wireshark aka Ethereal sniffer, netwatch, tcpdump and others. Sometime you change default ports to increase security, so make sure you are connecting to correct remote port. Most service connects to default port such as If you are using Cisco PIX or dedicated Linux / OpenBSD box as firewall, check logs for more information. Make sure your own firewall is not blocking access to remote server. It is possible that someone may have pulled out network cable from switch/workstation. Make sure the network cable is plugged into interface as well as into network switch/hub. # route #5: Check for network cables and power supply It is a good idea to restart network interface: Some time network admin make changes to DHCP server or changes IP routing or other stuff. Make sure you have correct IP address assigned by DHCP server. If traceroute point out that you cannot reach to your own gateway, then check routing setting on your own workstation.
$ traceroute #3: Look for default route / gateway IP You can always find out if server is down from your own workstation or gateway router. traceroute provides the detailed information about path to a network server. If you cannot ping your server at all, use traceroute to trace network problem.
If you can ping by IP address but not by hostname, then make sure you have correct DNS name servers setup in /etc/nf file. Steps to diagnose the problem: #1: Use ping commandĪlways ping the IP address of server and then try hostname. You can try these tips/tools to diagnose an issue of Linux network connectivity to remote or local servers. In this article I will try to provide tools and information about how to diagnose network configurations. Many new admin or Linux users get frustrated when their remote Linux box is not accessible dues to network connectivity.
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