On 2/11/11 10:23 AM, Matthew Fitzgerald wrote: > Joel, its inline because prevention requires intervention.
It doesn't actually require that, plenty of ips systems can do their job with a tap and another port for injection. the fact of the matter is if the ids can't keep up with the presented load that's going to be a problem whether it's inline or presented through a tap, in the later case however it's not going to cause an outage. > You bring > up a good point though, perhaps the issue should be taken outside of > the technical arena and brought to the business/contract folks to > reset expectations around prevention/detection. > > > -----Original Message----- From: [email protected] > [mailto:[email protected]] On Behalf Of Joel Jaeggli Sent: > February 11, 2011 3:41 AM To: Andrew Plato Cc: 'Shang Tsung'; > [email protected] Subject: Re: IDS causing troubles > > You might ask yourself why it's inline rather than an on on monitor > port or a tap. > > There are serious scalability and performance problems to be had > when putting an inspection device in some locations in the network > and you should be mindful of that, ultimately if availability is a > consideration and it generally is and the thing causes outages them > you have a rather a big problem. > > joel > > On 2/1/11 12:26 PM, Andrew Plato wrote: >> All network engineers want to burn down the IPS. That's nothing >> new. >> >> >> Disruptions should not be common. Most modern IPS/IDS solutions >> are pretty good about minimizing the downtime. ISS stuff is pretty >> good about this, although not great. >> >> I'd say your outsourced provider may have some issues or you need >> to update to the latest versions. >> >> Firmware updates should be scheduled to coincide with normal >> maintenance windows in case there is any downtime. Signature >> updates can also be scheduled for a reasonable daily or weekly >> window. >> >> Network admins will blame EVERYTHING on the IDS/IPS because it's >> easier for them to blame the IPS then for them to do their jobs. >> There is a possibility you have network infrastructure issues. You >> might want to consider getting a third party assessment of your >> network. That way you can get an objective analysis that will hold >> more weight with management. >> >> Good luck. >> >> >> Andrew Plato, CISSP, CISM, QSA Anitian Enterprise Security >> >> >> >> -----Original Message----- From: [email protected] >> [mailto:[email protected]] On Behalf Of Shang Tsung >> Sent: Tuesday, February 01, 2011 1:53 AM To: >> [email protected] Subject: IDS causing troubles >> >> 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 >> >> ----------------------------------------------------------------- >> Securing Your Online Data Transfer with SSL. A guide to >> understanding SSL certificates, how they operate and their >> application. 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