Range ip isolation

[atomico]

Hello, i am using gargoyle 1.7.1. This is my situation:
Router ip 192.168.1.1
Group Pc A: 192.168.1.100-192.168.1.120
Guest DHCP 192.168.1.18-192.168.1.28

I need that the GUEST one can't see lan stuffs of the group A. I can't use the wireless isolation feature because some group A are wireless.

How can i do it?

edit: i did some test and i think i success..

http://i.imgur.com/8BXa0xo.png

is it correct? (i added the last two rows)

[ispyisail]

is it still working as expected?

[atomico]

Hi, yes, it work for me.