Re: [Tcpreplay-users] An Help needed in using tcpreplay for behind NAT setup

[Aaron T. <syn...@gm...>]

What kind of traffic?  You know TCP traffic won't work right?  Also,
have you verified the src/dst IP and MAC addresses of the packets
match up to something the NAT gateway will accept?  Ie: the correct
dst IP/MAC (needs to be the interface of the NAT box tcpreplay is
facing) and the source IP is in the right subnet (so routing works).

Been a while since I played with iptables, but you should look in the
log files and see how the packets are being processed.


On Tue, Jan 31, 2012 at 9:53 PM, Senthil Kumar S
<sen...@sa...> wrote:
> Hi,
>
> Thanks for your reply. I am sorry to give you a whole lot of explanation below,
>
> NAT box set up is done with the iptable commands
>
> iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
>
> This works good if I browse or if connect to internet from the behind nat windows pc.
>
> So I thought the same is enough and so I didn make any changes in the captures with respect to tcpreplay. I just pumped the traffic I already captured using tcpreplay in the nat box eth0 interface. Still the traffic is not received by the behind nat windows pc.
>
> Any small help is really appreciable.
>
> Regards
> S. Senthil kumar
>
>
>
> -----Original Message-----
> From: Aaron Turner [mailto:syn...@gm...]
> Sent: Wednesday, February 01, 2012 5:41 AM
> To: Main forum for tcpreplay
> Subject: Re: [Tcpreplay-users] An Help needed in using tcpreplay for behind NAT setup
>
> Not really a whole lot to go on, but obviously I'd make sure your NAT config is correct and that the destination MAC/IP/Ports are correct.
> And read any logs on the NAT box.
>
> On Tue, Jan 31, 2012 at 2:41 AM, Senthil Kumar S <sen...@sa...> wrote:
>> Hi All,
>>
>>
>>
>> I am using tcpreplay version - 3.4.4 for my testing activity.
>>
>>
>>
>> My test set up consists of,
>>
>>
>>
>> one windows pc sits behind nat (eth0 ---> connected to eth1 of nat
>> pc), one nat pc (eth1 --> connected to behind nat windows pc, eth0
>> ---> connected to ubuntu pc where tcpreplay is running), one ubuntu pc
>> where tcpreplay is running (eth0 ---> connected to eth0 of nat pc).
>>
>>
>>
>> I had already taken some captures and trying to replay that traffic
>> using tcpreplay from the ubuntu pc (in the above mentioned set up).
>> problem is packets are received in eth0 of the nat pc but not
>> forwarded to the behind nat (windows) pc.
>>
>>
>>
>> Is there anything I need to do with tcpreplay???
>>
>>
>>
>> kindly help.
>>
>>
>>
>> Regards
>>
>> S. Senthil kumar
>>
>>
>>
>>
>>
>>
>> ________________________________
>> SASKEN BUSINESS DISCLAIMER: This message may contain confidential,
>> proprietary or legally privileged information. In case you are not the
>> original intended Recipient of the message, you must not, directly or
>> indirectly, use, disclose, distribute, print, or copy any part of this
>> message and you are requested to delete it and inform the sender. Any
>> views expressed in this message are those of the individual sender
>> unless otherwise stated. Nothing contained in this message shall be
>> construed as an offer or acceptance of any offer by Sasken
>> Communication Technologies Limited ("Sasken") unless sent with that
>> express intent and with due authority of Sasken. Sasken has taken
>> enough precautions to prevent the spread of viruses. However the
>> company accepts no liability for any damage caused by any virus transmitted by this email.
>> Read Disclaimer at http://www.sasken.com/extras/mail_disclaimer.html
>>
>> ----------------------------------------------------------------------
>> -------- Keep Your Developer Skills Current with LearnDevNow!
>> The most comprehensive online learning library for Microsoft
>> developers is just $99.99! Visual Studio, SharePoint, SQL - plus
>> HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now!
>> http://p.sf.net/sfu/learndevnow-d2d
>> _______________________________________________
>> Tcpreplay-users mailing list
>> Tcp...@li...
>> https://lists.sourceforge.net/lists/listinfo/tcpreplay-users
>> Support Information: http://tcpreplay.synfin.net/trac/wiki/Support
>
>
>
> --
> Aaron Turner
> http://synfin.net/         Twitter: @synfinatic http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.
>     -- Benjamin Franklin
> "carpe diem quam minimum credula postero"
>
> ------------------------------------------------------------------------------
> Keep Your Developer Skills Current with LearnDevNow!
> The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now!
> http://p.sf.net/sfu/learndevnow-d2d
> _______________________________________________
> Tcpreplay-users mailing list
> Tcp...@li...
> https://lists.sourceforge.net/lists/listinfo/tcpreplay-users
> Support Information: http://tcpreplay.synfin.net/trac/wiki/Support
>
> ------------------------------------------------------------------------------
> Keep Your Developer Skills Current with LearnDevNow!
> The most comprehensive online learning library for Microsoft developers
> is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
> Metro Style Apps, more. Free future releases when you subscribe now!
> http://p.sf.net/sfu/learndevnow-d2d
> _______________________________________________
> Tcpreplay-users mailing list
> Tcp...@li...
> https://lists.sourceforge.net/lists/listinfo/tcpreplay-users
> Support Information: http://tcpreplay.synfin.net/trac/wiki/Support



-- 
Aaron Turner
http://synfin.net/         Twitter: @synfinatic
http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows
Those who would give up essential Liberty, to purchase a little temporary
Safety, deserve neither Liberty nor Safety.
    -- Benjamin Franklin
"carpe diem quam minimum credula postero"