IPS not detecting packets Entering & Exiting Same Interface

Hi,
Consider scenario :-
Host A--->Router B--->Router C
All are in the same subnet
Router C also has an active interface on another subnet.
When I telnet from A to C (interface with ip address in another subnet),
I force traffic from A to C to pass through B, by setting static routes AND ** DISABLING IP REDIRECTS ***
Trafic flows from A to B IN through Fa0/0, and OUT again through Fa0/0 from B to C
I have ACL's (permit/log) that show this flow !!!!
I also have IPS enabled in/out on Fa0/0 on router B.
However, traffic flowing through Router B, which enters / exits the same interface, does not get picked up by IPS. (I trigger signatures)
Is this normal ?? Or am I missing something ?

I don't use the router IPS, but I'll give it a shot;-) I don't understand the network config. I'll try to redraw the network to see if I understand what you're saying:
Host A
(NET1/IP1)
|
-------- (NET1/IP3) Router C (NET2/IP4)---
|
(NET1/IP2)
Router B
Host A uses Router B as its gateway to NET2 and since redirects are disabled on router B, all traffic from Host A to IP4 flows through router B. If the diagram above is correct though, return traffic from router C will not be routed through Router B because the destination is on the same network as router C. How are you getting return traffic to flow through router B?
Based on the following doc:
http://www.cisco.com/application/pdf/en/us/guest/products/ps6634/c1244/cdccont_0900aecd80327257.pdf
If you're attempting to fire atomic signatures (single packet) then signatures should still fire anyway when inspected inbound. If you're attempting to trigger a stateful signature then this would be a plausible explanation.

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