I am trying to understand the difference between adding an ACL to an interface with the ip access-group in ip access-group out statement. I have 'in' on one interface, and 'out' on another, and they seem to behave differently. Both of the interfaces end up going out to the internet. A firewall allows the 192.168.3.0/24 range out to the internet. So the 192.168.150.0/24 network gets NAT'd to 192.168.3.100-150 (Overloaded), and the 192.168.3.0/24 interface just keeps the same IP.
The difference in applying an ACL in or out is pretty easy. When you apply an ACL "in", the router examines all traffic it RECEIVES on the interface against the ACL.
When you apply an ACL "out" on an interface the router examines any traffic attempting to leave that interface against the ACL.
Also, I take it that your firewall is connected to your interface FastEthernet0/1. ANd also that you are NATing the 192.168.150.0/24 to 192.168.3.100-150 (Overloaded) on this router?
I imagine you are using NAT or PAT on the firewall for 192.168.3.0/24 traffic to access the internet. If you do not want your 192.168.150.0/24 traffic to go to the internet, I suggest removing the NATing on the router.
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