Personal opinion here:
Unless you have a subpoena from a law enforcement agency, you don't need to do a thing. If you have a subpoena, explain to them that your network configuration does not allow you to identify the user. Ask them what kind of assistance they can offer.
End of opinion.

They should know the IP address on the other end. Run Torch on the inside of your network with the other IP as the Destination address. See which customer hits it. OR, run Packet Sniffer (a MT tool) withe the IP address in the filter. After a while analyze the file with WireShark or something similar.

On 9/9/2011 7:34 PM, ~NGL~ wrote:
I need to know which client is  downloading copyrighted material.
NGL
*Sent:* Friday, September 09, 2011 4:24 PM

    *To:* WISPA General List <mailto:[email protected]>
    *Subject:* Re: [WISPA] Individual IP addresses

    www.arin.org <http://www.arin.org> assuming you are in the
    Americas.  Otherwise you will get assignments from the
    organization for your area.
    IP addresses are not cheap, but are obtainable.
    I know Bret said NAT is not ideal, but I have 500 customers behind
    a couple of NATs in the same /24 from my provider and I do not
    have any problems.
    What issue are you trying to solve?

    On 9/9/2011 6:23 PM, ~NGL~ wrote:
    How many  addresses are in a block?
    What is the cost?
    NGL

        *From:* Josh Luthman <mailto:[email protected]>
        *Sent:* Friday, September 09, 2011 3:09 PM
        *To:* WISPA General List <mailto:[email protected]>
        *Subject:* Re: [WISPA] Individual IP addresses

        Do you want to buy a block from ARIN? Isp?

        Josh Luthman
        Office: 937-552-2340
        Direct: 937-552-2343
        1100 Wayne St
        Suite 1337
        Troy, OH 45373

        On Sep 9, 2011 5:38 PM, "~NGL~" <[email protected]
        <mailto:[email protected]>> wrote:
        > No, I believe I need my own block of IP addresses to assign.
        > NGL
        >
        > --------------------------------------------------
        > From: "Scott Reed" <[email protected] <mailto:[email protected]>>
        > Sent: Friday, September 09, 2011 2:31 PM
        > To: "WISPA General List" <[email protected]
        <mailto:[email protected]>>
        > Subject: Re: [WISPA] Individual IP addresses
        >
        >> So how are they configured that they use the same address?
        >> Are you looking for DHCP?
        >>
        >> On 9/9/2011 5:22 PM, ~NGL~ wrote:
        >>> Wireless
        >>>
        >>> --------------------------------------------------
        >>> From: "Scott Reed"<[email protected]
        <mailto:[email protected]>>
        >>> Sent: Friday, September 09, 2011 2:17 PM
        >>> To: "WISPA General List"<[email protected]
        <mailto:[email protected]>>
        >>> Subject: Re: [WISPA] Individual IP addresses
        >>>
        >>>> What kind of clients?
        >>>> Is this a wireless, wired, hotspot or some other kind of
        network?
        >>>>
        >>>> On 9/9/2011 4:33 PM, Blake Covarrubias wrote:
        >>>>> Please provide more information on what you're trying
        to achieve. Are
        >>>>> you
        >>>>> talking about public or private addresses?
        >>>>>
        >>>>> --
        >>>>> Blake Covarrubias
        >>>>>
        >>>>> On Sep 9, 2011, at 11:29 AM, ~NGL~ wrote:
        >>>>>
        >>>>>> How do I setup my clients so they all have individual
        IP addresses?
        >>>>>> Thanx
        >>>>>> NGL
        >>>>>>
        >>>>>>
        >>>>>>
        
--------------------------------------------------------------------------------
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        >>>>>>
        >>>>>> WISPA Wireless List: [email protected]
        <mailto:[email protected]>
        >>>>>>
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        >>>>>
        >>>> --
        >>>> Scott Reed
        >>>> Owner
        >>>> NewWays Networking, LLC
        >>>> Wireless Networking
        >>>> Network Design, Installation and Administration
        >>>>
        >>>>
        >>>>
        >>>> Mikrotik Advanced Certified
        >>>>
        >>>> www.nwwnet.net <http://www.nwwnet.net>
        >>>> (765) 855-1060
        >>>> (765) 439-4253
        >>>> (855) 231-6239
        >>>>
        >>>>
        >>>>
        >>>>
        >>>>
        
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        >>>> WISPA Wants You! Join today!
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        >>>>
        
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        >>>>
        >>>> WISPA Wireless List: [email protected]
        <mailto:[email protected]>
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        >>>>
        >>>> Archives: http://lists.wispa.org/pipermail/wireless/
        >>>
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        >>>
        
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        >>> WISPA Wants You! Join today!
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        >>>
        >>> WISPA Wireless List: [email protected]
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        >>
        >> --
        >> Scott Reed
        >> Owner
        >> NewWays Networking, LLC
        >> Wireless Networking
        >> Network Design, Installation and Administration
        >>
        >>
        >>
        >> Mikrotik Advanced Certified
        >>
        >> www.nwwnet.net <http://www.nwwnet.net>
        >> (765) 855-1060
        >> (765) 439-4253
        >> (855) 231-6239
        >>
        >>
        >>
        >>
        >>
        
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        >> WISPA Wants You! Join today!
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        >>
        >> WISPA Wireless List: [email protected]
        <mailto:[email protected]>
        >>
        >> Subscribe/Unsubscribe:
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        >> Archives: http://lists.wispa.org/pipermail/wireless/
        >
        >
        >
        >
        
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        >
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        ------------------------------------------------------------------------


        
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-- Scott Reed
    Owner
    NewWays Networking, LLC
    Wireless Networking
    Network Design, Installation and Administration



    Mikrotik Advanced Certified

    www.nwwnet.net
    (765) 855-1060
    (765) 439-4253
    (855) 231-6239

    ------------------------------------------------------------------------


    
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--
Scott Reed
Owner
NewWays Networking, LLC
Wireless Networking
Network Design, Installation and Administration



Mikrotik Advanced Certified

www.nwwnet.net
(765) 855-1060
(765) 439-4253
(855) 231-6239


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