Date: Fri, 26 Nov 2010 16:09:09 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: nangergong <nangergong@gmail.com> Cc: freebsd-ipfw@freebsd.org Subject: Re: two questions:1 relationship between dummynet and wireshark 2 how to add latency for each packet to be sent Message-ID: <20101126150909.GA93106@onelab2.iet.unipi.it> In-Reply-To: <AANLkTimiomgh8cMh4o_4TTQ820YBHVJCf_1ibAq7O63t@mail.gmail.com> References: <AANLkTi=xPLG4JuJaRxdiRZra%2BYbfkQB5Sn%2B%2B2QAsAnes@mail.gmail.com> <20101125181825.GA79947@onelab2.iet.unipi.it> <AANLkTimiomgh8cMh4o_4TTQ820YBHVJCf_1ibAq7O63t@mail.gmail.com>
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On Fri, Nov 26, 2010 at 02:43:12PM +0000, nangergong wrote: > Hi??? > > Thank you so much for your reply. I used the windows version of > dummynet/IPFW, so is it the same that wireshark will intercept > incoming traffic before dummynet, and outgoing traffic after dummynet? Coz it all depends on where you run dummynet and where you run wireshark (is there a windows version of it ?) All i can tell you is that - on FreeBSD and linux, dummynet intercepts packets at the IP level, and wireshark sits just on top of the device driver (using bpf or similar mechanisms); - on windows, it acts as a miniport driver (so, it probably gets the full packet including MAC headers), but i have no idea where wireshark works -- it might be a miniport driver as well, in which case the order of loading might be relevant cheers luigi
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