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network-diagnostic-tips [2016/07/15 10:17]
serbizadmin 		network-diagnostic-tips [2016/07/16 15:53]
serbizadmin
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 ====== Network Diagnostic Tips ====== ====== Network Diagnostic Tips ======
  
-To say that a site is unaccessible is hardly helpful to its administrators. Please help us address the issue head on by using the following tips:+To just say that a site is inaccessible is hardly helpful to its administrators. Please help us address the issue head on by using the following tips:
  
 **1. Run a traceroute from your commandline and from an independent site.**\\ **1. Run a traceroute from your commandline and from an independent site.**\\
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   tracert myportal.upou.edu.ph   tracert myportal.upou.edu.ph
  
-on **Mac** or **Linux**\\+On **Mac** or **Linux**\\
   traceroute myportal.upou.edu.ph   traceroute myportal.upou.edu.ph
 {{ ::myportal_traceroute_screenshot.png?nolink&600 |}} {{ ::myportal_traceroute_screenshot.png?nolink&600 |}}
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 Please send the whole result to [email protected]\\ Please send the whole result to [email protected]\\
 \\ \\
-From an independent site like [[http://network-tools.com|network-tools.com]], a traceroute result would look like this+From an independent diagnostic site like [[http://network-tools.com|network-tools.com]], a traceroute result would look like this
 {{ ::nwtools_traceroute.png?nolink |}} {{ ::nwtools_traceroute.png?nolink |}}
  
 \\ \\
-In both cases, both traceroute instances suggest that MyPortal is reachable. In the event that your local traceroute fails but the one from third-party works, please report the issue to your local Internet service provider.\\+In both cases, the traceroute instances suggest that MyPortal is reachable. In the event that your local traceroute fails but the one from third-party works, please report the issue to your local Internet service provider (ISP).\\
 \\ \\
-2. Change your computer's DNS.  +**2. Change your computer's DNS.** \\ 
-{{ ::mac_dns.png?nolink&200 |}} +It's possible that your local ISP's DNS (Domain Name System) is acting erratically. Change it to some reliable DNS like Google's (8.8.8.8 or 4.4.4.4) or those (208.67.222.222  or 208.67.220.220) from OpenDNS. 
-**2. Test your site's DNS.** +{{ ::mac_dns.png?nolink&500 |}} 
-http://dnscheck.pingdom.com +DNS is like the phone book of the Internet. It keeps track of website names like myportal.upou.edu.ph.\\
  
 +**3. Help trace possible packet loss with MTR.**\\
 +Using an Admin or root account, run this from the command line\\
 +   mtr myportal.upou.edu.ph
 +That should display something like this:
 +{{ ::myportal_mtr.png?nolink |}}
 +Send your own results to [email protected]\\
 +\\
 +**4. Test your site's DNS.**\\
 +Diagnostic sites like [[http://dnscheck.pingdom.com|Pingdom]] can help your administrator figure out the issue. Report if you find anything strange. 
  
  
 +----
 +For some people, doing all these could be overwhelming. Just do the ones that you can do or are willing to.
Last modified: 2020/06/13 15:10