using tcp replacement reset interface
Hi I'm new to cisco ips. can someone tell me pls the function to use the alternative interface for tcp reset.
I have 2 interfaces for IP addresses. a command and control and other interface is an interface in promiscious mode.
without this command the ID can send some tcp resets. or because it uses a different interface for tcp resets.
can someone tell me pls.
concerning
Assane
Under most of the facilities the tcp replacement reset interface is not necessary.
By default the ports TCP resets will come back on the same interface where the attack was detected.
So if your interface promiscuity is connected to a 100 Mbps for tracking hub then the tcp reset will be sent back this same interface promiscuitee in the hub.
Or if your interface promiscuity is connected to the span switch port, the tcp reset will be sent back the same interface of promiscuity in that span port.
The question becomes is the sensor can send reset tcp, but if the switch will accept them. Various switches will accept from the span port tcp resets. Some switches require only an extra parameter on the extended configuration to tell the switch to allow incoming packets to the span port.
BUT there are some switches that do NOT allow incoming packets of their span ports.
These ituations are the reason for the replacement tcp reset the configuration of the interface.
Need 2 remote sensing interfaces (one for surveillance of promiscuity and the used the other as just replacing tcp reset interface). The port command and control NOT allow as the other tcp reset interface.
Connect to the interface promiscuity to the scope of the switch port. You configure the second interface as the alternate tcp reset interface of the first interface of promiscuity. Then plug the second interface on the switch of the saem (but do not have the 2nd one a span port).
Now, when the sensor detects an attack on interface 1 it will NOT send tcp resets the interface 1, but rather will send the reset tcp on the 2nd interface.
Given that the switch does not accept that the tcp resets since the span port you need of the second interface for tcp resets in the switch.
It is also possible with taps where the taps (because the taps have no way to accept incoming packets).
The alternative tcp reset interface configuration is ignored when it is configured for online tracking. It is used only with supervision of promiscuity.
Tags: Cisco Security
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