[nwebe] How to track TCP socket variables? (cwnd, ssthresh)

[Lev Walkin]

Knocke wrote:
> thanks :-) I must admit that Stevens says sth about that tool.
> 
> But there's still (at least) one thing I don't understand: how to enable
> socket debbuging? Is it possible only when socket is created (fe: by some
> special system call) ? If yes, does it mean that it depends on the
> aplication itself, if it opens its sockets for debbuging and/or if it gives
> a command line switch command to turn it on?

Yes, the application must use setsockopt() call to enable socket debugging.
If an application does not turn it on, you can create a simple library
which would substitute socket() with socket()+setsockopt(SO_DEBUG) pair,
and attach it to the application via LD_PRELOAD.

> hk
> 
> 
> ----- Original Message ----- 
> From: "Bruce M Simpson" <bms at spc.org>
> To: "Knocke" <knockefreebsd at o2.pl>
> Cc: <freebsd-net at freebsd.org>
> Sent: Saturday, April 10, 2004 2:00 PM
> Subject: Re: [nwebe] How to track TCP socket variables? (cwnd, ssthresh)
> 
> 
> 
>>On Sat, Apr 10, 2004 at 01:23:24PM +0200, Knocke wrote:
>>
>>>Could somebode give me hint what to do? Is there any tool to connect to
> 
> existing TCP socket and dump its state per each segment sent or received? Or
> any other way to achive the goal? It could be also a kind of dedicated
> benchmark tool (lice ttcp) that comes togehter with what i need, I don't
> necesarly need to track existing sshd or apache owned sockets.
> 
>>man 8 trpt
>>
>>BMS
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> 
> 
> 
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-- 
Lev Walkin
vlm at netli.com