Greetings.
We have 4 masters (rsync'd together) and a pair of load balancers each of which
distributes queries to any of the 4. On the masters, we run Solaris 10 with
BIND 9.5P1. Recently, one of the 4 stopped using TCP on port 53, but UDP
traffic continued unaffected. What would cause the TCP port to stop? The port
was unresponsive from the backside of the load balancers, and no DNS TCP
packets came from the server either. Is there anything in BIND which would
detect and block a potential DOS attack?
Thanx,
mrak
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