Adding extension to Interface to 4235 4FE - requirements, warnings?

I'm under version 4.1 (1) S48 on 4235 sensor.

I want to monitor two separate subnets in the DMZ with a sensor. 4.1 supports several interfaces of promiscuity, it seems that the addition of the 4FE interface card support this well. Bandwidth is not really a concern, these connections are not heavily used T - 1 connections.

My questions are related to the impact on the sensor. Will there be additional requirements of memory/CPU by adding more surveillance interfaces? I noticed that it also seem to be a new plug-in memory available for sensors, I was wondering if this is related?

From a point of view of configuration, I assumed that, for the moment, the same signature settings will be applied to all virtual devices (virtual sensor is equivalent to a physical interface of remote sensing)? It is very good for the current application, but I wonder if it is will be supported for different signature by virtual sensor parameters in the future?

Any reserves, traps, etc. that you can share on the displacement of several interfaces of remote sensing would be appreciated.

Thank you

Chad

Traps to keep in mind:

4FE card is attached to four 10/100 ports. The standard onboard sniffing port is a 10/100/1000. So be aware of the limit of 100 Mbps on FE 4 10/100 ports.

Since you are dealing with only T1 lines that won't be a problem for you.

The performance of the IDS-4235 is based on the total bandwidth of all interfaces combined.

If I remember correctly the IDS-4235 performance rating is about 250 Mbps.

So let's say that you plug in 3 interfaces of the 4FE, then 3 interfaces could send up to 300 Mbps of traffic and overwhelm the sensor performance.

It could be worse if we consider the 1000 Mbps card on board. So, theoretically with all 4 plugged FEs and the edge sniffing plugged as well, you could theoretically send 1.4 Gbps of traffic to this sensor years 250Mbps seriously overwhelm.

In you case to connect only 2 ports currency limit you the total maximum rate 200 Mbps (still more low whereas you have T1 connections) so it will not be a problem for you, with performances of the 4235 250 Mbit/s.

With regard to the other CPU/memmory. There is no additional CPU or available for the 4235 memmory. The additional memmory was only for old models of 4210 and 4220.

You do not need anyway. 250 Mbit/s performance is based on the provided memmory and cpu regardless of the number of interaces since it's overall performance and not by the performance of the interface.

When version 4.1 is loaded with the 4FE each of the interfaces is usually attributed to "interface group 0" and default is off (stop). You should make sure that the interface you are using are indeed assigned to the "interface group 0" and then activate the interfaces that you want to use (no downtime).

You are right to assume that version 4.1 supports a single virtual sensor (single set of configurations of signature) which is applied to all interfaces.

Indeed the virtual sensor is applied to "interface group 0" and all interfaces are placed in group 0. The only group 0 is currently supported for a single virtual sensor is currently supported.

Support for multiple virtual devices / groups is planned for a future release (could not begin to speculate when that can happen).

Since a single virtual sensor is used, it is sometimes confusing determine on what interface things occurred.

Each event lists on which interface the packet that triggered the alert has been detected. SO for example with a sweep of ping host first 4 pings can be seen on an interface but the 5th ping that triggers the alert can be seen on the second interface; This translates into the second interface in the alert.

Marco

Tags: Cisco Security

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