Last Wednesday we had a major network issue. The story started from end-users calling our help-desk and soon there was a chaos in the department because of the increasing number of phone calls. Soon users spread the news among themselves and we confirmed the whole site is experiencing networking issues.
We spent almost 5 hours sorting out the problem, however I will only mention the steps anyone should be taking in this scenario to cut the long story short.
1. First thing first always check whether you can connect to the core switches on the site. In our case we had 2 core switches and one went down because of a faulty port on the switch (in our case it was F11). It does sound very easy however it was a nightmare for us to get to this information because we couldn't even login to the switch. We had to connect and log-in to the other core switch and find the faulty port from there.
2. Second thing to look for is the DNS. Reboot your DNS server and it fixes the problem 5 out of 10 times.
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