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I don´t want blocked CDP by Firewall

patricio.rodriguez
Level 1
Level 1

‎07-11-2003 02:13 PM - edited ‎03-02-2019 08:49 AM

I´d like to konw if it exist some trick to allow CDP pass through a Firewall, so I could discover (Campus Manager 3.2) a network behind the firewall (NOKIA IP 440). I know that Routers can be jump with a checkbox in Campus Manager.

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rmushtaq
Level 8
Level 8

‎07-11-2003 02:24 PM

CDP is a mac-layer protocol which is multicast, so it is not possible to

permit this through the PIX firewall by ip/port. CDP only gives neighbor information. You will not see CDP flow from one side of the network across the PIX to the other. You can still poll the devices on the other-side to get their neighbor status, just not the device connected to the PIX.

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