[Bro] handle out of order and retransmitted packets in offline trace

Song Zhao sxz135 at case.edu
Tue May 17 17:24:50 PDT 2011

Is that function of reassembling TCP bytestream embedded in event engine and
enabled by default when using http-rewriter.bro, or there is a policy
script  we need to call to sort out the tcp packets? Thanks.

On Mon, May 16, 2011 at 7:25 PM, Vern Paxson <vern at icir.org> wrote:

> > Can Bro itself differentiate these retransmitted and out of order
> packets?
> It's not clear what you mean by differentiate.  Bro reassembles the
> TCP bytestream, correctly acounting for retransmitted and out-of-order
> packets.
> > Besides, can http-rewriter.bro handle the special HTTP packet which, for
> > example, includes 2 or more requests or response or even one and half
> > requests or responses?
> Per Ruoming's earlier comment, http-rewriter.bro does *not* operate on
> individual packets, it operates on the reassembled bytestream.  It then
> constructs new packets from that bytestream.  The timing of these packets
> reflects the timing of the original packets, but the *sequencing* of the
> packets does not.
>                Vern
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