The traffic is fully TCP traffic, with some UDP packets (DNS queries and responses).
Src ip and dst ip's are always between the NAT box ip and the server ip in the internet. ex: src ip=10.2.12.156 ; dst ip= 203.22.15.75 (dst ip changes based on the server available in the internet). I am replaying this traffic without making any changes using tcpreplay tools. This scenario is ok?? or I need to do any changes in the way the traffic gets replayed??. Regards S. Senthil kumar -----Original Message----- From: Aaron Turner [mailto:synfina...@gmail.com] Sent: Wednesday, February 01, 2012 12:41 PM To: Main forum for tcpreplay Subject: Re: [Tcpreplay-users] An Help needed in using tcpreplay for behind NAT setup 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 <senthilkuma...@sasken.com> 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:synfina...@gmail.com] > 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 <senthilkuma...@sasken.com> > 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. 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Free future releases when you >> subscribe now! >> http://p.sf.net/sfu/learndevnow-d2d >> _______________________________________________ >> Tcpreplay-users mailing list >> Tcpreplay-users@lists.sourceforge.net >> 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. 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Free future releases when you > subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Tcpreplay-users mailing list > Tcpreplay-users@lists.sourceforge.net > 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 Tcpreplay-users@lists.sourceforge.net 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 Tcpreplay-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/tcpreplay-users Support Information: http://tcpreplay.synfin.net/trac/wiki/Support
