Drop ID vs Reset

I understand that drop a package prevents the connection broke in your network, and a TCP Reset resets the connection in both directions.

Which is not functionally pretty much the same thing? Whatever it is, you end the connection, right?

Since TCP Reset only works on TCP traffic, why even use it? Is not abandoning the connection good enough take care of this?

A question to be considered is that of system resources.

If the ear falls the connection (or packets), the connection is not able to continue.

BUT the client and the server think that the connection is still ongoing and will return packets and conserve system resources open until a possible time-out occurs.

With TCP Reset, another part of the client and the server knows the connection has been reset and may release the system resources and stop making resends.

However, the TCP Reset by itself, does not guarantee that the connection will disappear.

TCP Reset is a better estimate for the sequence of numbers for the connection to be reset. You are indeed to misuse of the connection, and diversion does not always work (especially in fast connections).

If all you are worried for prevents an attack then drop packets works very well.

But if you are worried about dropping the attacks but also to free up system resources (particularly a web server that can be constantly attacked in the case of worms) I would recommend that you use the action down and restore actions.

SIDE NOTE:

Version 4.1 of the ID software support TCP resets, but does not support the actions of moving.

SPI version 5.0 (forthcoming) will support a new InLine feature that supports drop as actions (the so-called deny actions in IPS v5.0). So in 5.0, you can do the two rejections of an action and a tcp reset action on signatures which often fire. This way your servers won't be wasting resources on connections that have already been removed by the PPE.

Tags: Cisco Security

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