Collecting log messages from UDP sources
Central logging is based on TCP connections in most cases (or even encrypted TCP connections) as it provides several reliability features that are simply not available using UDP. Still, there are certain situations, when you have to use UDP. One use case is when the company standard syslog configuration for servers contains only a single, common UDP destination, and it cannot be altered because of company IT policies. The other, more common use case is, that network devices, for example routers, switches or firewalls send their logs using UDP. Most of the time the TCP implementation of syslog is completely missing from these devices. In some cases it is there, but badly broken and therefore avoided by the users.
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