Re: Identifying packets beyond proxies

[masonke <masonke () gmail com>]

To do what you want, I would first identify the flows using the 5-tuple (src/dst IP, src/dst port and protocol), then 
find the packets using the actual Seq / Ack number pair and if available, the timestamps. Relative numbers mean just 
that, relative to the capture. If you have the SYN from the session on all your captures, then relative frames should 
be enough. If you don’t, they you need the actual numbers.
Kevin Mason
~KEM


> On Apr 2, 2015, at 10:22, Julio Talaverano <delaflota () yahoo com> wrote:
>
> Hi,
>
> I have to investigate on slow speed in the pick hours when our users surf the internet.
> The first problem is that we use three proxies throughout our network (A, B and C) until the last one(C) connects 
> to the web server through the last firewall.
> The second problem is, we use the BitBox Enterprise solution which  means that any connections 
> connect over a vpn to he BitBox gateway and then the traffic continues through the other proxies in clear 
> which means I can't follow a connection from the initiating client.
>
> My approach is to capture the traffic on all intermediate stations in  order to find out the RTTs of several http 
> packets 
> when they enter the proxy A (Ironport)  and when the same packet leaves the internet firewall.
> If this time is too long then I try to find the bottleneck inside our network.
>
> So I tried a few tests accessing some unusual pages just to be sure that they are not in any of the caches and no one 
> else is 
> accessing them while I'm testing.
>
> My question is now how I can reliably identify a packet along the whole path(at any intermediate capturing device)?
> Are the rel. SEQ# in Wireshark reliable enough? or at least a series of identical SEQs?
>
> Or is there a better way to do that?
>
> Thanks
> Julio
>
>
>
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