On my dns server i got several of these in the event viewer:
"The DNS server encountered an invalid domain name in a packet from 89.33.88.1. The packet will be rejected. The event data contains the DNS packet."
"The DNS server encountered an invalid domain name in a packet from 89.33.88.2. The packet will be rejected. The event data contains the DNS packet."
This dns server only serves internal hosts on a small local lan and no dns requests are permitted into the network from the outside.
What does this mean?
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