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New Member

IPS 4240 5.0 inline mode configuration

Dear Pros,

Please let me know the IPS placement for the following network scenarios i am implementing for my customer

-DSL internet connection terminated in Cisco 3825 internet router.

-3825 inside ethernet segmemt goes to PIX failover pair outside segment.

-PIX Failover pair inside zone now connected to the inside core 4510R switch in the separate vlan 32 (

-SVI ip address for inside pix zone is

-In the core i have created multiple floorwise vlans for each buildings

-Created SVI for L3 interface in the core for all the vlans

In this setup I want to insert the IPS in inline mode.

Please suggest me the suitable design to place the IPS to configure it as inline mode with configuration details.




Re: IPS 4240 5.0 inline mode configuration

Hi .. basically it depends on which segments you are trying to protect. If you are only interested about protecting the Inside segments from the internet. then the IPS could be placed inline between the Firewall's internal interface and the Core 4510R on Vlan32. This will provide protection for all you inside segments however because you are using the Core for Inter-vlan routing, traffic between your internal segments will not be inspected.

I hope it helps .. please rate it if it does !!

New Member

Re: IPS 4240 5.0 inline mode configuration

Dear Fernando,

Thank you for your excellent info.

I can put inline with fw to protect all segments to internet.

But If i want to protect the each vlan then how can i configure the ips to protect?

What about inline vlan ips.

Please explain it in details.




Re: IPS 4240 5.0 inline mode configuration

Check this document about sensor placing

It always depends on your preferencies and data flows