Re: [Tcpreplay-devel] tcpreplay-edit plugin for just-before-sending payload rewrites

[Simon T. <sim...@gm...>]

Hi Aaron,

Thanks for the info.  I was able to do what I needed by hacking tcpedit.c,
but I am curious - would it be much work to further modify it so the
packets are edited immediately prior to sending, rather than prior to
delaying?  I'm going to take a quick look to see, but you perhaps know off
the top of your head.

Thanks,

Simon.

On Thu, Sep 15, 2016 at 7:59 PM, Aaron Turner <syn...@gm...> wrote:

> Hey Simon,
>
> Basically, if you're using tcpreplay-edit each packet is edited prior
> to the delay before sending.  What that means is that if you're
> sending packets as fast as possible (delay=0) then the timestamp
> should closely match when the packet is actually sent.  However, if
> you are sending packets at a slower rate, then there will be a
> difference equal to the delay.
> --
> Aaron Turner
> https://synfin.net/         Twitter: @synfinatic
> Those who would give up essential Liberty, to purchase a little temporary
> Safety, deserve neither Liberty nor Safety.
>     -- Benjamin Franklin
>
>
> On Thu, Sep 15, 2016 at 5:40 PM, Simon Thornington
> <sim...@gm...> wrote:
> > Hi all,
> >
> > I am interested in running a tcpreplay where, just prior to sending the
> > packets, I rewrite some timestamps in the interior of the UDP payloads.
> I
> > need this timestamp rewrite to happen as close as possible prior to
> sending
> > the frame out the interface.  Is this when tcpreplay-edit plugins are
> > invoked?  Or are they invoked prior to some intermediate buffering to the
> > outbound interface?  (as appears to be the case with solar_replay for
> > solarflare cards).
> >
> > Thanks,
> >
> > Simon.
> >
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