[Winpcap-users] Loopback Device on Windows

[Gianluca Varenni]

I don't know exactly how the microsoft loopback interface works (I hope to play with it this coming weekend), but in general it will not allow you to capture the packets to/from the IP loopback address 127.0.0.1: such packets are managed directly by the TCP/IP protocol driver, and they do not reach any lower layer. WinPcap sits in parallel with the TCP/IP protocol driver, so it will not be able to see packets that do not go out of the TCP/IP stack.

Have a nice day
GV

  ----- Original Message ----- 
  From: George Elias 
  To: winpcap-users at winpcap.org 
  Sent: Tuesday, December 02, 2008 5:04 AM
  Subject: Re: [Winpcap-users] Loopback Device on Windows


  Sorry to trouble again, 

  But, does anyone know if there is a way to get the loopback interface automatically? I mean, someway I can code so it runs the right way in any computer... I guess that if I hard code the interface name it will be different on another computer.

  Thank's a lot!


  On Tue, Dec 2, 2008 at 10:35 AM, George Elias <fs.georgee at gmail.com> wrote:

    Hi Eddie!

    Just thanking you! It passes that point now.... Got other issues, but those are from the code I have...

    Thank's a lot!



    On Tue, Dec 2, 2008 at 10:08 AM, Eddie Ehlin <eddie.ehlin at vastgotadata.se> wrote:

      George Elias skrev:

        Hi Eddie,

        I did that, but I don't know the name of the device...

        Thank's a lot for the reply!


        On Tue, Dec 2, 2008 at 7:50 AM, Eddie Ehlin <eddie.ehlin at vastgotadata.se <mailto:eddie.ehlin at vastgotadata.se>> wrote:

           George Elias skrev:

               Hi all,

               I'm porting some former cooworker's code from Linux to Windows.

               On Linux it uses device "lo" as loopback device, what should I
               use on Windows? Libpcap can't find "127.0.0.1

               <http://127.0.0.1> <http://127.0.0.1>" neither "localhost" not

               even "ACE_LOCALHOST".


               Any help would be a great help!

               Thanks in advance

               --        George Elias Ferreira da Silva
               MSN: fs.georgee at gmail.com <mailto:fs.georgee at gmail.com>

               <mailto:fs.georgee at gmail.com <mailto:fs.georgee at gmail.com>>

               Skype: fs.georgee
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           Hi George,
           I'm not an expert at this but on Windows you need to install a
           network-adapter (MS Loopback).
           You should be able to install this adapter via the "Add&Remove
           hardware" under control-panel.

           See: http://support.microsoft.com/kb/839013

           Best regards,
           Eddie
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        -- 
        George Elias Ferreira da Silva
        Fone: (48) 9911-5084

        MSN: fs.georgee at gmail.com <mailto:fs.georgee at gmail.com>
        Skype: fs.georgee
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      Hi,

      You should be able to find the name of the device by calling pcap_findalldevs(). Check the example project "WpdPack/Example-pcap/iflist" which is shipped with the dev-pack.
      A name should look like something like this: \Device\NPF_{989C471A-BA83-4065-814A-6D5881F7957E}

      Though all the devices that is listed by calling pcap_findalldevs() is not suited for pcap, keep that in mind.

      I hope that this helps! :-)
      Best regards,
      Eddie

      Ps. No problem at all! Ds.

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    -- 
    George Elias Ferreira da Silva
    Fone: (48) 9911-5084
    MSN: fs.georgee at gmail.com

    Skype: fs.georgee




  -- 
  George Elias Ferreira da Silva
  Fone: (48) 9911-5084
  MSN: fs.georgee at gmail.com
  Skype: fs.georgee



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