How to protect input in graylog?

Question

syslog

In Graylog3, an input was created to which the log arrives from the device, and I still don’t understand how to protect this input, because anyone can send terabytes of garbage logs to my log collection system.
There is not a word about this in the documentation, syslog transmission occurs without authorization, there is no filtering by IP anywhere, the question is actually brewing - I didn’t understand something fundamentally?

Answer 1

If there is no filtering at the Graylog level, what prevents iptables from filtering by hosts?
But if you are now talking about the productive segment, you don’t want to ask yourself if everything is fine with our security, that “after all, anyone can send terabytes of garbage logs to my log collection system”