Network Monitoring witn Ntop

There are various types of network problems that occur in an organization,which results in inaccessible devices,performance degradation, etc.These can be classified as:

Network Hardware failure : Includes faulty devices like switches,Ethernet cards,improper cabling etc.

Network configuration problems : Includes issues related to improper configuration of protocols

Malicious code : Includes issues as a result of the presence of worms/viruses on the network

In order to troubleshoot network problems from scratch you need to start checking by hardware – ie,physically check network cabling,network cables crossovers over electric cables,quality of switches routers etc. If the problem lies in the hardware this method of tracking is reasonably straightforward.

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Multiple SSL Certificates on a Single IP using Apache

SNI ( Server Name Identification) allows you to host multiple SSL certificates on a single IP address. Although, hosting several sites on a single virtual private server is possible with the use of virtual hosts, providing separate SSL certificates for each site traditionally required separate IP addresses. The process has now been simplified through the use of Server Name Indication (SNI), which sends a site visitor the certificate that matches the requested server name.


1. Domain names should be registered in order to serve the certificates by SNI.

2. Root Privileges to the server.

3. Apache should already be installed and running

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NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference. Why should time be synchronized? If you have communicating programs running on different computers, when the time is not synchronized, the program run time ahead in one system and in one it will lag. Switching between these systems would cause time to jump forward and back, a non-desirable effect. And hence, air traffic control is one of the main applications for NTP.

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