Bind + response from unexpected source

[Jaroslav Stefka]

Dobry den,
uz asi treti den se mi v messages objevuji nasledujici zaznamy:

Sep 21 13:17:08 linux named[462]: Response from unexpected source ([195.47.23.100].53)
Sep 21 13:27:09 linux named[462]: Response from unexpected source ([195.47.23.100].53)
Sep 21 13:37:10 linux named[462]: Response from unexpected source ([195.47.23.100].53)
Sep 21 13:47:12 linux named[462]: Response from unexpected source ([195.47.23.100].53)
Sep 21 13:57:13 linux named[462]: Response from unexpected source ([195.47.23.100].53)

Kdyby se to stalou jednou, tak to chapu, ale co si myslet o tom, ze se zaznam objevuje 
pravidelne po 10 minutach?

System je RH 6.0 + bind 8.2.3-0.6.x.
Bind ma nakonfigurovany forwarder 193.165.192.9

Dekuji.

J. Stefka