[Oisf-devel] Question about the stream management module (StreamTcp)

[Asim Jamshed]

Thanks!

On Tue, Jul 8, 2014 at 5:29 AM, Anoop Saldanha <anoopsaldanha at gmail.com> wrote:
> On Tue, Jul 8, 2014 at 1:49 PM, Victor Julien <victor at inliniac.net> wrote:
>> On 07/07/2014 05:04 PM, Anoop Saldanha wrote:
>>> On Mon, Jul 7, 2014 at 3:30 AM, Asim Jamshed <asim.jamshed at gmail.com> wrote:
>>>> Hi,
>>>>
>>>> I have recently started using Suricata and have been browsing
>>>> the code. I have had previous practical and slight development
>>>> experience with Snort IDS. In specific, I have been trying to
>>>> analyze Suricata's stream management module. I haven't been
>>>> able to find enough documentation to answer a few questions I
>>>> had regarding the reassembly section of the module. The code
>>>> itself is somewhat complicated to follow. Therefore I am posting
>>>> the questions here. I apologize in advance if these questions
>>>> were previously asked as well.
>>>>
>>>> Q1. For a large (active) TCP flow, how many bytes (or segments)
>>>> does the module collect before it flushes it to the detect module.
>>>> I know that this variable can be adjusted via configuration file but
>>>> what is the default value? What is the name of the config variable
>>>> that can help me in changing that value?
>>>>
>>>
>>> If unspecified in the config file, it's 2560, else it's specify by the
>>> toserver-chunk-size option in the config file.
>>>
>>
>> By default some randomization is added as well, it will list the value
>> that is actually used at startup (if you use -v):
>>
>> [10054] 8/7/2014 -- 10:18:33 - (stream-tcp.c:570) <Info>
>> (StreamTcpInitConfig) -- stream.reassembly "toserver-chunk-size": 2634
>> [10054] 8/7/2014 -- 10:18:33 - (stream-tcp.c:572) <Info>
>> (StreamTcpInitConfig) -- stream.reassembly "toclient-chunk-size": 2440
>>
>
> Right.  I missed the randomization part.
>
> --
> -------------------------------
> Anoop Saldanha
> http://www.poona.me
> -------------------------------
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