Network interruption of XX University Library in China

September 9, 2013 China ky University

Fault symptom:

The library suddenly failed to access the Internet on the afternoon of June 13, September 7, and the failure of restarting the core switch remained.

Troubleshooting process:

1. log on to the core switch and check whether the core switch can access the internet. Check whether the core switch cannot be pinged to the Internet.

2. Confirm the connectivity between the core switch and the upper-layer firewall. The interface indicator light connecting to the firewall is not on)

3. Check whether the firewall is faulty. From the appearance, the indicator is normal. After the management software is used to wait for the firewall, it is found that the firewall has been disabled and the firewall is initially suspected to be faulty .)

4. Restart the firewall. After the firewall is restarted, you can access the Internet. However, if a fault occurs again five minutes after the firewall is restarted, the firewall system fault can be determined)

5. bypass the firewall to solve the fault.

6. The firewall repair equipment detects that the fan is aging, but it is not sure that the fault is the direct cause ).

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