[SQU] Bind pinging ?

Hi guys,

A quick question, why do our bind 8 DNS ping servers continously try and
ping our clients and visa versa ?

#Sample#
Feb 15 12:26:30 firewall kernel: Packet log: output DENY ppp0 PROTO=1
10.0.0.1:3 10.0.0.2:3 L=404 S=0xC0 I=44615
 F=0x0000 T=255 (#16)
#/Sample#

I know that Squid seems to do this too sometimes ?
Is there a way to disable this, because my firewall logs get kinda large !
;-)
Any help would be appreciated, thanks.

Kindest regards
David Wilson
The S.A Internet

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