I just switched my router from a Asus RT-AC3200 to a Netgear Nighthawk 6700 (which I upgraded to a 7000!) and flashed advanced tomato. I've been using pi-hole on my pi zero the past few weeks and everything worked like a charm. On my Asus router I set my Lan DNS to my pi hole IP, turned off DHCP and let my Pi handle everything. On the latest version of advanced tomato I only have the option to change my Wan DNS. There is no option to change my Lan DNS. Is something wrong? I log into the router admin page, go to Basic Settings > Network but it is not there. I'd post a link showing it but I can't since I have no karma.
Note - I also had this problem on my Asus AC68U using the latest version.