[SR-Users] TCP packet bundling

[Alex Balashov]

Henning,

Thanks a lot for looking into it! I appreciate it.

On Thu, Jan 09, 2020 at 04:51:32PM +0000, Henning Westerholt wrote:

> Hello Alex,
> 
> I just briefly looked into it, did not digged into the code much. 
> Kamailio is doing some queuing in TCP async mode (default) e.g. if there 
> is some delay in sending out the data.
> 
> One idea - have a look to the core parameters
> 
> - tcp_wq_blk_size
> 
> - tcp_conn_wq_max
> 
> and change them to see if it makes a difference in your particular 
> situation.
> 
> Cheers,
> 
> Henning
> 
> Am 08.01.20 um 00:39 schrieb Alex Balashov:
> > Yes, I understand the formal properties of TCP and that anything is
> > possible. Thank you for explaining.
> >
> > What I am asking is whether Kamailio takes pains to ensure--I suppose,
> > if one must be labouriously precise, to maximise the probability--that
> > multiple SIP messages are packaged into separate packets. To the extent
> > it can do so.
> >
> > On Tue, Jan 07, 2020 at 05:50:18PM -0500, Greg Troxel wrote:
> >
> >> Alex Balashov <abalashov at evaristesys.com> writes:
> >>
> >>> On Tue, Jan 07, 2020 at 03:29:13PM -0500, Greg Troxel wrote:
> >>>
> >>>> there is no real meaning to the end applications to what bytes of user
> >>>> payload are in which TCP segments within packets.
> >>> No, not to the application. But perhaps to third-party packet analysis
> >>> systems which reconstruct SIP state from what they see on the wire. :-)
> >> They need to reassemble segments and cope anyway.   There's a long
> >> history of evading firewalls by creative fragmentation.
> 
> -- 
> Kamailio Merchandising - https://skalatan.de/merchandising/
> Kamailio services - https://skalatan.de/services
> Henning Westerholt - https://skalatan.de/blog/
> 

-- 
Alex Balashov | Principal | Evariste Systems LLC

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