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Network Security Firewalls
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Layer 3 and Firewall

from [dubaisans dubai] Network Security [Permanent Link]
Subject: Layer 3 and Firewall
Date: Wed, 4 Oct 2006 20:44:46 +0530 
Hi,

Is it a REALLY BAD idea to have multiple Firewall segments connected
on the same 6509?

I have a 6509 Layer 3 switch which connects the LAN , WAN and Server
segment. This has three Layer 3 VLANs

I plan to implement a Firewall [ either PIX or checkpoint] which will
segregate  these 3 segments.

On the Cisco 6509 I will convert the existing Layer 3 VLANs into Layer
2 and assign those IP[which is the default gateway for the respective
segments] to the 3 interfaces of the Firewall.

Firewall is managed by me[Infosec dept] while the switch is managed by
Networking dept.

My worry is - After i implement Firewall , if the network admin pulls
out the Firewall cables and brings back the Layer 3 VLANs with those
IPs then there is no Firewall.

How can we tackle this risk ?

What is the technical workaround. Is it a REALLY BAD idea to have
multiple Firewall segments connected on the same 6509?

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