Availability Monitoring

Basically everything connected to the network can be considered as a service.

If there is a device on the network it always suits its purpose which is exactly providing a service. There are only different methods of checking the availability of those services.

Basic Level

Some of the services (devices) can be checked by a simple PING whereas others can be checked more thoroughly by Network Services monitors. Tthese monitors are called intelligent pings because they can check not only the connectivity but also received responses.

NetCrunch monitors the availability of over 65 predefined TCP/UDP network services, including DNS, FTP, HTTP, POP3, SMTP, etc. It can monitor network services performance measured upon a number of packets sent and received, response time, and the percentage of packets lost and received.

The monitored services can be customized and administrators can add their own definitions.

Advanced Level - User Experience Monitors

The monitoring of some important services can be performed on multiple levels. As the low level checks only basic service answer (it's usually some kind of HELLO), the higher monitoring levels allow checking more specific things like authentication (HTTP, FTP, POP3, SMTP) or if the service works properly (i.e. downloads file, receives and sends test emails).

HTTP/HTTPS

NetCrunch allows monitoring multiple URLs, and checking their availability. The program can also monitor page header or any content modifications. This ensures the proper display and desired content of the websites.

POP3

The program can periodically authenticate to the POP3 service with given credentials, thus confirming that e-mail users can successfully access the service.

SMTP

NetCrunch allows sending test email messages to a specific e-mail address. If SMTP service is unable to send the message, administrator is notified about it.

FTP

NetCrunch can authenticate to the FTP server. It can also monitor the directory file list and send notification if any change occurs (e.g. if any file has been modified or removed). Additionally, it can perform the file download test. It enables administrators to control the changes of FTP server content.

DNS

NetCrunch can resolve IP address or DNS name to verify if the DNS service response matches the expected pattern (defined by administrator in NetCrunch). It allows discovering unexpected (or even unauthorized) DNS changes.