Doing a random check of my server logs, looking for oddities and trouble.
In 'journalctl -u mastodon-web' I see, "ERROR -- : [ActionDispatch::HostAuthorization::DefaultResponseApp] Blocked hosts: <my server IP address>" as shown below.
Does this just mean someone/something is trying to access my Mastodon instance from the IP address and not the host name?
Safe to ignore? Normally the IP forwards to the domain name. I just checked and it does.
For a lecture dealing with DNS, I am trying to find a ballpark estimate of how often a DNS record gets updated. (In order to show how hosts.txt would never scale).
Up to date ballpark estimates of the current number of records on the internet are also appreciated.
Retoots while prevent a new Morris worm to ask all DNS servers to report the count in their zones :D
Based upon my experience, any TTL < 15s is inconsistent and doesn't work at all and <60s doesn't make much sense since all those will likely get cached not by authoritative nameservers but all the other DNS servers in between that may not necessarily handle TTLs below 60s well or at all.