[Winpcap-bugs] Re: Unable to list devices for interfacescontainingmany IPv6 addresses

[Gianluca Varenni]

You are definitely right. I didn't originally develop that code, so I don't know exactly why such limit is there, but it can definitely be fixed to dynamically allocate the storage for the addresses and use a linked list.

I will try to fix the code for the next version of WinPcap.
Do you have any sample app that programmatically adds such number of IPv4 and IPv6 addresses to an interface?

Have a nice day
GV
  ----- Original Message ----- 
  From: Bhairav 
  To: Gianluca Varenni 
  Cc: winpcap-bugs at winpcap.org 
  Sent: Wednesday, October 29, 2008 7:19 PM
  Subject: Re: [Winpcap-bugs] Re: Unable to list devices for interfacescontainingmany IPv6 addresses


  Hi GV,


  After quite a bit of fiddling with trying to build from source (thx for your pointers in using the VS 2005 Express), I was able to prove the below theory of the 16 addresses.


  Once I bumped up this value (to 1000) and replaced the original Packet.dll, I was able to get the list of interfaces by using the windump command.


  I am not sure why there is such a low limit (or why there is a limit at all), but hopefully this helps in perhaps fixing the issue faster?


  Thanks,
  Bhairav


  On Wed, Oct 22, 2008 at 6:30 PM, Bhairav <stan2k08 at gmail.com> wrote:

    Hi GV,


    Thanks for responding and confirming my emails are getting there :).


    Just wanted to let you know that I had looked at the code a little and think that part of the reason I am running into the issue is because there is a very low number IPv6 addresses being allowed, signified by the value of MAX_NETWORK_ADDRESSES.  Currently, that is set to 16.  So, it seems winpcap will only look up 16 IPv6 addresses before it decides to quit due to insufficient storage.


    HTH,
    Bhairav




    On Wed, Oct 22, 2008 at 12:26 PM, Gianluca Varenni <gianluca.varenni at cacetech.com> wrote:

      Your message has been correctly received on the mailing list, but I haven't found time to look at the WinPcap source code and understand exactly what the problem is.

      Have  a nice day
      GV
        ----- Original Message ----- 
        From: Bhairav 
        To: winpcap-bugs at winpcap.org 
        Sent: Tuesday, October 21, 2008 6:02 PM
        Subject: [Winpcap-bugs] Re: Unable to list devices for interfaces containingmany IPv6 addresses


        Hello All, 


        I had sent the previous email(s) for the very first time.  Wondering if it was even received by the list.  If so, any responses would be really appreciated.


        Thanks,
        Bhairav


        On Sat, Oct 18, 2008 at 5:20 PM, Bhairav <stan2k08 at gmail.com> wrote:

          Ooops ... apologies -- forgot to attach the file.  Attached now. 


          Thanks,
          Bhairav 



          On Sat, Oct 18, 2008 at 5:13 PM, Bhairav <stan2k08 at gmail.com> wrote:

            Hello, 


            I have captured debug information for an issue I am seeing according to the bug page on the WinPcap page.  Here are the details as requested on the page:


            1) WinPcap version is 4.1 beta4.  Please note, I was seeing the issue with 4.0.2 previously and decided to try out this beta version before reporting the problem.  The debug file created is with this beta version
            2) The output of windump -D is blank (the debug file will make it clear why this is the case)
            3) Win2k3
            4) 2 Network adapters installed - both HP NC324i PCIe Dual Port Gigabit Server, but I think the issue is independent of the adapters themselves
            5) The issue is this:  I have about 500 IPv4 and 500 IPv6 virtual addresses on one (out of 2) interfaces.  At the application level (wireshark and windump) I am not able to list the interfaces with these numbers of addresses.  I could have 1000 IPv4 addresses without a problem (in listing the interfaces) -- but whenever I get to a higher number of IPv6 (eg 1000 IPv4 + 14 IPv6), there becomes a problem listing the interfaces (a few IPv6 addresses is not a problem though). Looking at the debug file, I see the following error:
            [000005B4] 2008-10-18 16:34:23     The space in AdInfo->NNetworkAddresses is not large enough, failing


            Ideally, I wanted to use 1000 IPv4 + 1000 IPv6 addresses.  But, perhaps winpcap is not able to get enough space for all the IPs?


            Is it possible to increase the available storage space to accommodate these numbers of IP addresses.


            Thanks,
            Bhairav








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