Focus on IDS
IDS causing troubles Feb 01 2011 09:53AM
Shang Tsung (shangtsung71 gmail com) (9 replies)
Re: IDS causing troubles Feb 03 2011 10:32AM
Udo Sprotte (Udo Sprotte t-online de)
Re: IDS causing troubles Feb 02 2011 10:59PM
Paul Palmer (b paul palmer gmail com)
From your description it sounds like the network is disrupted whenever
the device activates and deactivates its network bypass. Normally the
bypass is disabled and the IDS/IPS maintains two distinct network
connections between two different switch ports and forwards packets
between them as it inspects them. When the most common bypass design
is enabled, the two switch ports are electrically connected and the
IDS is eliminated from the circuit.

IDS/IPS can be quite clever and can still forward packets surprisingly
well even when the two switch ports are configured differently.
However, if the device goes into bypass the two mismatched ports will
not be nearly so successful. I have heard of failures because one
switch port was in full duplex and the other in half duplex as a
common problem. There can also be speed mismatches. I have heard of
some switches that do not successfully complete auto-configuration
after bypass engages.

In a related configuration problem I have heard of failures in which a
pass-thru cable was used on one side of the IDS/IPS and a cross-over
cable was used on the other and this caused the ports to fail to
synchronize when the IDS entered bypass.

Although I suppose it is possible for the relay in the bypass to fail
and no longer close the contacts to engage bypass when it is supposed
to, I have never heard of this.

You did not mention which model IBM network IPS you had. If it is an
older one, retrofitting it with an active bypass unit could provide
significant relief. Such a device provides bypass capability by a
different means that largely avoids the network reconfiguration
problems it sounds like you might be experiencing.

Good luck.

On Tue, Feb 1, 2011 at 4:53 AM, Shang Tsung <shangtsung71 (at) gmail (dot) com [email concealed]> wrote:
> Hello,
>
> We have the following problem. Now and then, the IDS will cause
> disruptions to the network, especially after updates. We have an IBM
> (ex ISS) Intrusion Detection System with a few network sensors and
> several host sensors. The IDS is not managed by us but we have it
> outsourced.
>
> The disruptions mentioned above cause our network engineers extreme
> dissatisfaction (and anxiety) about the IDS and they would "burn the
> damn thing", if they could. We have 2 - 3 serious issues, causing
> downtime, per year.
>
> My questions are:
>
> - Are any of you experience the same issues?
> - Is these disruptions common to others or should we seriously
> consider replacing the IDS and/or the outsourcing company?
> - Could this be an issue with our network infrastructure?
>
> I will appreciate any thoughts.
>
> Thanks,
> ST
>
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[ reply ]
RE: IDS causing troubles Feb 02 2011 06:33AM
alex cc technion ac il
RE: IDS causing troubles Feb 02 2011 04:06AM
Alex Nepolian cognizant com
Re: IDS causing troubles Feb 02 2011 12:04AM
Antônio Arruda Neto (anetoarruda gmail com)
Re: IDS causing troubles Feb 01 2011 09:41PM
Jeff Ames (jeffames nemesissolutions co uk)
Re: IDS causing troubles Feb 01 2011 08:50PM
Shwetabh Sharma (shwetabhsharma gmail com) (1 replies)
RE: IDS causing troubles Feb 04 2011 06:35AM
IT_H_Security (IT_H_Security MahindraSatyamBPO com)
Re: IDS causing troubles Feb 01 2011 08:48PM
JiPi DiNi (jipidini gmail com)
RE: IDS causing troubles Feb 01 2011 08:26PM
Andrew Plato (andrew plato anitian com) (1 replies)
Re: IDS causing troubles Feb 11 2011 07:41AM
Joel Jaeggli (joelja bogus com) (2 replies)
RE: IDS causing troubles Feb 12 2011 06:39PM
Bob-Buel (bob buel org) (1 replies)
SV: IDS causing troubles Feb 15 2011 07:39AM
Anders Petrén (anders certezza net)
RE: IDS causing troubles Feb 11 2011 06:23PM
Matthew Fitzgerald (matthew fitzgerald cae com) (2 replies)
Re: IDS causing troubles Feb 14 2011 05:21PM
Curt Purdy (infosysec gmail com)
Re: IDS causing troubles Feb 11 2011 07:14PM
Joel Jaeggli (joelja bogus com) (2 replies)
Re: IDS causing troubles Feb 15 2011 03:23PM
Joel Esler (joel esler me com) (1 replies)
Re: IDS causing troubles Feb 18 2011 02:21PM
Curt Purdy (infosysec gmail com) (1 replies)
Re: IDS causing troubles Feb 18 2011 02:28PM
Joel Esler (joel esler me com) (1 replies)
Re: IDS causing troubles Feb 18 2011 02:49PM
Curt Purdy (infosysec gmail com) (1 replies)
Re: IDS causing troubles Feb 18 2011 02:51PM
Joel Esler (joel esler me com)
Re: IDS causing troubles Feb 14 2011 06:28PM
JiPi DiNi (jipidini gmail com) (1 replies)
Re: IDS causing troubles Feb 15 2011 03:25PM
Joel Esler (joel esler me com) (2 replies)
Re: IDS causing troubles Feb 19 2011 03:47AM
Ichilov (zivi radware com)
RE: IDS causing troubles Feb 15 2011 04:08PM
Matthew Fitzgerald (matthew fitzgerald cae com)


 

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