Network Hog

I have a computer that is hogging bandwidth.  When I go to Wireshark I am told that the computer:
8096      25.694570      192.168.2.206      224.0.0.251      MDNS      128      Standard query response A, cache flush 192.168.2.206 PTR, cache flush 5DC03C000000.local

I, however, cannot find that computer on my network when I use LANSurveyor.  Is there any way that anyone out there knows to get rid of this computer getting access and apparently ruining access to the internet for everyone else?  That record appeared some 2000 times in 30 seconds, so they are definitely messing up everyone.  
aclaus225Asked:
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denver218Commented:
block the IP address not user:)
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denver218Commented:
I don't know what kind of router or firewall you have, but you could block that user.
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aclaus225Author Commented:
It is a Cisco 851 router
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denver218Commented:
Do you currently have an access-list on your inside interface?
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aclaus225Author Commented:
Yes
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aclaus225Author Commented:
access-list 120 deny 192.168.2.206 any
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aclaus225Author Commented:
I had the user blocked, but apparently the access-list wasn't applying it.
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