[Orca-users] Re: TCP attempt fail rate

[Blair Zajac]

Martin,

Thanks.  I've updated with page

http://www.orcaware.com/orca/docs/orcallator.html#TCP_attempt_fail_rate

with this information.

You can also watch this value grow by doing this:

netstat -s | grep tcpAttemptFails
telnet www.caltech.edu 64321
netstat -s | grep tcpAttemptFails

Best,
Blair

-- 
Blair Zajac <blair at orcaware.com>
Web and OS performance plots - http://www.orcaware.com/orca/

Martin Jenner wrote:
> 
> Blair
> 
> Thanks for the quick response. I'll tell you what I know.
> If you run netstat -s (on a Solaris machine at least) you get a set of protocol
> statistics including TCPAttemptFails
> After you email it appears that  twhat ORCA shows is that figure. There's an
> official definition in the RFC's of what this value means - to paraphrase;  it
> records interrupted attempts to make a connection.
> 
> Thanks four your help
> 
> Martin
> 
> Blair Zajac wrote:
> 
> > Martin Jenner wrote:
> > >
> > > Hello
> > >
> > > I work for a large ISP and one of our customers is using your ORCA tool
> > > to moinot performance of the servers we manage for them.
> > >
> > > They've raised an issue about the "TCP attempt fail rate" levels that
> > > ORCA is recording.
> > >
> > > Can you tell me exectly what this is measuring so I can address the
> > > issue?
> >
> > Hi,
> >
> > [cc'ing Orca Users mailing list.]
> >
> > Good question.  My page
> >
> > http://www.orcaware.com/orca/docs/orcallator.html#TCP_attempt_fail_rate
> >
> > specifically the section at
> >
> > http://www.orcaware.com/orca/docs/orcallator.html#TCP_attempt_fail_rate
> >
> > doesn't describe a whole lot.
> >
> > Looking at the SE source code which gets this from the kernel
> > (RICHPse/include/mib.se)
> >
> > uint  tcpAttemptFails;  // # of dir. SYN-SENT/RCVD->CLOSED/LISTEN { tcp 7 }
> >
> > Does anybody know exactly what this measures?  It looks like it's the
> > number of active connections the host is attempting to set up that fail
> > per second.
> >
> > > is this recording some system parameters actually on the machine or
> >
> > Yes.
> >
> > > would it be recording data from some remote machine trying to connect?
> >
> > No, it doesn't appear so.
> >
> > Best,
> > Blair
> >
> > --
> > Blair Zajac <blair at orcaware.com>
> > Web and OS performance plots - http://www.orcaware.com/orca/
> >
> > >
> > > Any data would be gratefully received.
> > >
> > > Best Regards
> > >
> > > Martin Jenner
> > > Internet Support Group
> > > NTL