I config the 1811 to be a FW. It can filter and block IM service if the PC and workstation are on the VLAN1. It is working properly.
ip address 192.168.12.1 255.255.255.0
I will put another router and connect to 192.168.12.0 segment.
ip address 192.168.12.2 255.255.255.0
ip address 192.168.18.2 255.255.255.0
ip address 192.168.19.2 255.255.255.0
I find that all packets of R2 (192.168.18.0/24 and 192.168.19.0/24) are blocked by 1811.
How to configurate the 1811 so that the 1811 can allow those segment go out and protect those two segments?