Port-wise your screwed.  Napster will find an open port.
Best thing to do is block to these address ranges:

208.178.163.56  mask: 255.255.255.248
208.178.175.128 mask: 255.255.255.248
208.49.239.240 mask: 255.255.255.240
208.49.228.0 mask: 255.255.255.0
208.184.216.0 mask: 255.255.255.0


> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Thomas Novin
> Sent: Tuesday, April 25, 2000 8:50 AM
> To: [EMAIL PROTECTED]
> Subject: napster
> 
> 
> Hi.
> 
> I would like to block all users on our network to run napster. 
> How do i know
> which ip ranges or ports i should block?
> 
> Thomas.
> 
> 
> 
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