Newbie Qustions

I just got a project which includes the installation and configuration of devices IPS-4240. I used the IPS modules in the ASA devices in the past, but the dedicated devices are new for me. So I really have a few basic questions

1 are these devices purely IPS, or they perform tasks of IDS so if configured correctly?

2 - where in the path of data should they be placed, my solution is web hosting with a firewall, load ballancer and IPS?

3 do not operate devices IPS to L2 or L3?

The IPS-4240 can be used in conjunction with a derivation of NetOptics or ShoreMicro switch.

The ByPass switch would be connected inbetween 2 network devices (typically between a firewall or router and a switch).

Then, there are 2 additional ports on the bypass switch that are then connected to 2 ports of the sensor.

2 sensor ports must be configured as a pair of InLine Interface.

If the sensor is in the way of traffic, then traffic from the firewall in the bypass switch will be sent to the probe on the 1st port. The sensor analyzes the packets and transfers on the 2nd port on the bypass switch. The bypass switch passes on the main switch.

The same for traffic from the main switch.

The bypass switch transmits packets at the 2nd port of the sensor. Packet is parsed and passed through the 1 port. The bypass switch then passes the packet on the firewall.

However, if the probe stops passing traffic (sensor loses connection, sensor is turned off or sensor stops just processing for some reason any), then the bypass switch will detect that the traffic to and from the sensor has stopped.

The bypass switch will then connect the firewall and switch directly to each other and as you say it, it acts like a cable transmission.

The same happens also if the bypass switch power is lost.

So for the IPS 4215 IPS-4235, IPS-4250, IPS-4240, IPS-4255 it requires a switch of derivation of NetOptics or ShoreMicro for this feature.

The IPS-4260 and IPS-4270, however, have this functionality integrated directly into their 4 port copper TX NIC GE so a bypass switch it is not necessary when using these cards. (Ignore the switch always needed for 2 network interface cards GE fiber ports)

We call the function above material ByPass where avoidance can happen even with loss of power on the sensor.

The sensor also supports a feature we call SOFTWARE ByPass. With software ByPass the driver for the CARD itself will pass through even the analytical engine should stop analysis for some reason any.

In most situations the sensor still has the power and the software bypass road takes care to pass traffic through and it is basically just power failure or sensor reboot of the situations in which a hardware bypass feature is used.

All the sensor platforms are supported by the features of circumvention software.

Also understand that the sensor supports 3 types of InLine monitoring mode.

(1) in mode InLine Interface pair where 2 interfaces are paired together for the follow-up online. Hardware bypass switches (or the NIC of ByPass of material in the IPS-4260 and IPS-4270) can be used in mode InLine Interface pair.

(2) the InLine Vlan pair mode where 2 VLANS on a single interface is paired together for the follow-up online. Because only a single NETWORK adapter is used there is no ByPass material support for InLine Vlan pair mode.

(3) designated chassis mode InLine for Modules. For our PURPOSE - IPS (module to the router) and AIP - SSM (module for the SAA), it is the chassis configuration (router or ASA) that determines whether a package can be monitored online or not.

There is no ByPass hardware support for modules.

HOWEVER, the router and the ASA supported by a configuration "rescue" where if the sensor module fails then the router / ASA is able to continue the traffic passing through even if the sensor module has failed. If the configuration of 'rescue' can be considered the equivalent of the sensor module of the function of derivation of material for devices.

In all 3 modes of monitoring online above, IPS software does support the functionality of circumvention software.

Tags: Cisco Security

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