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Old 05-09-2016, 07:44 PM   #1
bomurf
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Network Connectivity troubleshooting steps in Linux based DC


Hi,

For those that work in DC's with Linux based machines that are built in house...a ticket comes in to check network connectivity on a server (purposely vague in nature as this is sometimes the case from a requester), what general good practice steps would you take?
 
Old 05-10-2016, 12:22 AM   #2
sag47
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There's multiple ways to test. Some of the most common include using telnet or netcat. In general, in order to test you need:
  • The source host (the host you ssh to test from)
  • The destination host.
  • Destination port.

Let's say the destination host is example.com and destination port is 80 (to test HTTP). I would use the following command.

Code:
nc -vz example.com 80
That's just one of many ways to test. Other ways include using:
  • telnet
  • nmap
  • openssl s_client
  • traceroute (for testing over TCP to a destination port)

Those utilities are OK at testing just the socket but can do much more. Additionally, it depends on the protocol you're testing because there may be a whole suite of utilities which can test that protocol over the network. Many ways to tackle the same problem in Linux.

In general, when I get tickets that are vague I tend to ask the requester more questions. If they want the work done they should be more than willing to fill you in on the info you need. I also tend to document guidelines for opening tickets with example scenarios of common requests and information I need to complete the request. This way requesters have a reference to open tickets with proper information (saves us both time).

Last edited by sag47; 05-10-2016 at 11:05 PM.
 
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