Re: definition for Inline IDS/IPS

[Graeme Connell <gconnell () middlebury edu>]

By my understanding, an inline IDS or IPS actually has packets pass 
through it as opposed to passively sniffing packets on a network.  And 
because packets going from one location to another must pass THROUGH the 
inline IDS, the possibility opens up to modify traffic on a 
packet-by-packet basis.  Therefore, not only can attacks be detected; 
they can actually be nullified by modifying packet payload.
   Regarding the IDS/IPS definition, if an inline IDS actually DOES 
modify packets to nullify attacks instead of just alerting of suspicious 
activity, it becomes an IPS.  In that case, it is actually PREVENTING 
attacks from succeeding.  I should note that ALL inline intrusion 
detection systems that I've heard of are IPS.  But that doesn't mean, I 
don't think, that you couldn't have just an inline IDS.

      --Graeme Connell

Vijai K (Infosec) - CTD, Chennai. wrote:

> Hi folks ,
>
> can anybody pls clarify me the functionality definition for inline
> IDS/IPS??How it differ from normal IDS operation??
>
> i came to know that Inline IDS is nothing called as IPS ,am i rite.
>
> pls clear my doubt..
>
> thanx in advance 
>
>
>
> Regds
> Vijai.K
>
>
>
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