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tap mode vs inline mode


we are planing to implement the M-3050 appliance in our core network.

We like the TAP mode, but we are not sure if it is effective as inline mode.

Can anybody share their thoughts on this?

2 Replies

Re: tap mode vs inline mode


The detection rate is same as inline mode.

The difference is just the availability of block the attack packet, quarantine the attacker ip.

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Re: tap mode vs inline mode

  • In-line mode
    In-line mode places a Sensor directly in the network traffic path, inspecting all traffic at wire speed as it passes through the Sensor. In-line mode enables you to run the Sensor in a protection/prevention mode, where packet inspection is performed in real time, and intrusive packets can be dealt with immediately; you can drop malicious packets because the Sensor is physically in the path of all network traffic. This enables the prevention of an attack from reaching its target.

  • Full-duplex tap mode
    Tap mode works through installation of an external wire tap (I-4000,I-4010) or built-in internal taps (I-2600,I-2700). A Sensor deployed in tap mode monitors or sniffs the packet information as it traverses the network segment.

    Full-duplex taps split a link into separate transmit and receive channels. Sensors provide multiple monitoring interfaces to monitor the two channels, and Sensor ports are wired in pairs to accommodate full-duplex taps. Typically there is a limited number of SPAN ports per switch, and often there is competition for those ports. Tap mode enables you to monitor traffic on a segment of traffic where no SPAN port is available.

    The downside of tapped mode is that, unlike in-line mode, you cannot prevent attacks. Tap mode is passive; the Sensor essentially sees malicious traffic as it passes. You cannot inject response packets back through a tap, so discovering an attack in tap mode triggers a response post-attack.

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