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Incoming packet through Port 53 blocked

Hello
I'm reading packetfilter.log file and I have seen entries like this:

2009:11:10-03:16:13 MYFIREWALLNAME ulogd[3247]: id="2001" severity="info" sys="SecureNet" sub="packetfilter" name="Packet dropped" action="drop" fwrule="60001" seq="0" initf="eth1" outitf="eth1" dstmac="xx:xx:xx:xx:xx:xx" srcmac="00:00:00:00:00:00" srcip="DNS SERVER IP ADDRESS" dstip="WAN IP ADDRESS" proto="17" length="67" tos="0x00" prec="0x00" ttl="57" srcport="53" dstport="3107"

I don't know how exactly DNS server works, in my lan we use DNS specified in srcip value and all seems to work fine. In your opinion, should I enable packets directed to port 53 to be accepted to my WAN address?

Thank you
Eclipse79

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