Traceroute is an application that traces the path data takes from one computer to another. Basically a traceroute is a map that shows what stops or locations that data must pass through in order to go from one computer to another.
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To be an effective troubleshooting tool, the traceroute needs to be run from a computer experiencing the problem while the problem is occurring.
QFabric System,QFX Series,OCX1100,M Series,MX Series,T Series,SRX Series,EX Series,PTX Series. Routes, displayingto specified network host Display the route that packets take to a specified network host. Use traceroute as a debugging tool to locate points of failure in a network. Tools like ping, traceroute, lookup, whois, finger, netstat, ipconfig, and port scanners are available on nearly every operating system you can get your hands on. They’re used for everything from troubleshooting a connection to looking up information. Whether you’re using Windows, Linux, or Mac OS X, these tools are always close at hand. Mac has a GUI tool for this built into OS X. From the Applications folder, open the Utilities folder, and then open the Network Utility application. Within the Network Utility you have Traceroute.
How Do I Run A Traceroute?To Run a Traceroute in Windows
The command application (cmd.exe) is used to run a traceroute on Windows. Launching it is slightly different depending on your version of Windows:
To run the traceroute, type:
tracert domainname.com
into the command prompt, where “domainname.com” is the name of the server to which you are having difficulty connecting.
The traceroute may take only a few seconds or a few minutes. Typically, the closer you are to the server, geographically, the more quickly the traceroute will complete.
To Run a Traceroute in Mac OS X
If you have a Mac, you can use the built-in network tools to run a traceroute.
To Run a Traceroute in Linux
At the command line, type:
traceroute domainname.com
What Does the Traceroute Show You?![]()
Let’s take a few sample traceroute outputs.
![]() traceroute msu.edu
The output from that command shows a successful trace:
traceroute to msu.edu (35.8.10.134), 30 hops max, 40 byte packets
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It looks like gibberish, right? But it’s actually fairly easy to understand. After the traceroute command, the program tells you what it’s doing:
The numbers at the far left are the number of the hop, followed by the name and/or IP address of the router that hop is going through. You can see that this trace started within the Liquid Web network, progressed through AT&T and found its way to msu.edu.
The set of three numbers on the right side of the lines indicate the amount of time, in milliseconds, it took for that hop to complete. Traceroute performs each hop three times.
Note: When troubleshooting network latency by analyzing the time of each hop, please be aware that distance from your geographic location to the server is a factor. Any single hop covering a large physical distance (such as when crossing an ocean) naturally will take longer to complete.
In this example, there are no asterisks (which indicate a failure to respond within 5 seconds) and no inordinately long delays. If your traceroute to your VPS server looks like this, you’re in good shape in terms of network connectivity.
Now, let’s look at a simulated traceroute that ends without reaching its destination:
traceroute liquidweb.com
Tracert Equivalent In Mactraceroute to liquidweb.com (209.59.139.21), 30 hops max, 40 byte packets
In this example, our trace failed because we deliberately ran it from our internal network (just to demonstrate what a failed trace would look like).
You can see that, beginning on the fifth hop, we have nothing but packet loss. The traceroute continued for the full 30 hops, each reporting * * * as it went.
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If your traceroute to the server ends with asterisks like this one, and never displays an IP address or server name after the asterisks, that means that the connection was not able to be completed. This could be for a variety of reasons including:
However, if the traceroute picks back up following a series of asterisks and ultimately ends with a server name and IP address, it means that the connection was successful — regardless of how many hops exceeded the 5-second response time. This can be an indication of network issues along the routes used in those hops, but it does not indicate a network problem on either your end or the server’s.
Note: If you see these asterisks once you are inside Liquid Web’s network, there may be no need to worry. VPS customers frequently are not able to trace to their instance on the parent server.
If you believe you are experiencing network issues, having the output of traceroute handy and providing it, along with your public IPV4 address (which you can obtain from http://ip.liquidweb.com) when contacting Heroic Support® is an excellent way to help us begin investigating the issue as quickly as possible.
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