Re: SCTP De-chunking support

[vineeth vijay <vineethvijaysv () gmail com>]

Hi,

> Dissection is fine. What I was wondering is whether it is possible to
show these individual data chunks as separate frames themselves.
> But they are in the same frame. I really prefer not to show them in a way
they
have not been on the wire.

Basically agreed on the above point.  Changing the default behavior may not
be good due to all the copied lower layer bytes and resulting increase in
the size of capture in case there are 4-5 chunks per packet. But still feel
it would be a nice optional feature to have when doing actual offline
analysis.

> Hence, when i apply display filter ,  only the chunks with  exact matches
should be visible. Is this supported currently?
> No. Filtering is based on packets. Not sure how to improve that. We can't
show 'half' of a packet.
However, there might be ways to draw your attention to the upper layer
packet which matches the
filter.
Regarding above point, would like to suggest that the packet information
being displayed can be restricted to the PDU which actually matches the
display filter. E.g out of an SCTP packet carrying 3-4 M3UA chunks, the
pinfo of only the  chunk matching the filter can be displayed?

Vineeth

On Fri, Jan 11, 2013 at 12:54 AM, Michael Tuexen <
Michael.Tuexen () lurchi franken de> wrote:

> On Jan 10, 2013, at 5:31 PM, vineeth vijay wrote:
>
> > Hi,
> >
> > Dissection is fine. What I was wondering is whether it is possible to
> show these individual data chunks as separate frames themselves.
> But they are in the same frame. I really prefer not to show them in a way
> they
> have not been on the wire.
> > Hence, when i apply display filter ,  only the chunks with  exact
> matches should be visible. Is this supported currently?
> No. Filtering is based on packets. Not sure how to improve that. We can't
> show 'half' of a packet.
> However, there might be ways to draw your attention to the upper layer
> packet which matches the
> filter.
>
> Best regards
> Michael
> > Currently , i use the below tool for this purpose:
> > http://frox25.no-ip.org/~mtve/wiki/SctpDechunk.html
> >
> > Regards,
> > Vineeth
> >
> > what problem are you trying to solve? Wireshark supports dissecting the
> upper layer paylaod
> > for bundled DATA chunks for ages...
> >
> > Best regards
> > Michael
> > > Vineeth
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