Hi,
I have a Vigor 2925n on which I have set up two separate LANs on two separate interfaces. I have allocated the following subnets to the LANs:
192.168.3.0/24 (LAN3)
192.168.100.0/24 (LAN4)
I have also configured InterLAN routing to allow traffic to pass between the two LANs. Up to this point the config works fine.

I have another requirement, which is that while devices on LAN3 should be able to access devices on LAN4, no device on LAN4 should be able to access any device on LAN3. To achieve this I have set up a firewall filter with the following settings:

Check to enable filter rule: Checked

Direction: LAN -> LAN
Source: 192.168.100.0 255.255.255.0
Destination: 192.168.3.0. 255.255.255.0
Service: Any
Fragments: Don't Care

Action/Profile: Block Immediately

Despite this, i can still ping both from LAN3 to LAN4 and vice versa.

Can anyone please tell me where i have gone wrong?

Thanks

just switch off the inter vlan routing.