Re: Shomiti Taps, Cisco Port Mirroring and IDS

[Don Ng <sayhockng () yahoo com>]

 Hello John, the following case is where the firewall
is connected directly to the external router. So there
was no switches that could be used to carry out
Spanning. So I was looking at how to use taps.
 The only reason to use taps instead of hubs is to
ensure that when there is a power failure, the normal
traffic can still pass thorugh.
 Though I could get an UPS for the HUB :)

Thanks
Don


--- John Adams <jna () retina net> wrote:
> I don't understand why you would ever need one of
> these devices if you
> have the two switches on a VLAN and you have a span
> port enabled.
>
> On the other hand, if you think you need another
> hub, perhaps you could
> use two crossover cables in and out of the tap?
>
> -john
>
> On Thu, 3 Jan 2002, Don Ng wrote:
>
> >  Hello all, just need some assistance on the issue
> of
> > Shomiti taps. I have spoken to the vendors but
> they
> > had to check ...
> >
> >  I am looking at their Century taps that comes
> with 4
> > ports.
> >  Two ports are used to place the device inline
> with
> > the segment to be monitored.
> >
> > Original
> >   Router-----Firewall
> > After
> >   Router----<P 1> Century TAP <Port 2>---Firewall
> >                   |         |
> >                  <P 3>    <P 4>
> > The vendors advised me that for the other 2 ports,
> I
> > was told that each port mirrored out one direction
> > flow. Eg. Router --->Firewall for Port 3 and
> > Firewall---> Router for Port 4.
> >
> >  From the looks of things I would have to connect
> both
> > Port 3 and 4 to another Hub and plugging an
> network
> > IDS into that hub.
> >
> >  Router----<P 1> Century TAP <Port 2>---Firewall
> >                   |         |
> >                  <P 3>    <P 4>
> >                     |      |
> >                      HUB
> >                       |----NID-200
> >
> > Is this the optimal way to put an inline tap.
> > Cisco port mirroring seems to work fine mirroing
> > multiple ports to a single port connected to an
> IDS.
> > Glad for any help and comments.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > =====
> > A Nobel Peace Prize for Jim Henson,
> >  He bought laughter to a lot of people.
> >
> >  PS: I work in www.Quantiqint.com so
> >  comments regarding CyberGuard FW, NFR Security,
> Network-1,
> >  might be judged to be biased.
> >
> > __________________________________________________
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>
> --
> J. Adams                                      http://www.retina.net/~jna
>
> I'm not offened by the things that you say, 'cause
> it's such a predictable
> way to wreak havoc / Talk. I need something to agree
> with at first / You
> were right / I was wrong / Now does that make you
> happy?  --Lush


=====
A Nobel Peace Prize for Jim Henson,
 He bought laughter to a lot of people.

 PS: I work in www.Quantiqint.com so 
 comments regarding CyberGuard FW, NFR Security, Network-1,
 might be judged to be biased.

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