Linksys Router Question

I am using a Linksys BEFSR41 router and within a few minutes after I turn my Motorola SB5101 modem off svchost.exe sends UDP packets out to the DNS servers through over a dozen different ports. I am wondering why this happens and if it is anything to be concerned about as presently I am reluctant to turn the modem off and thus allowing this to happen because when at idle there is never any outgoing traffic sent out to the DNS servers.


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