create a text file at /jffs something like this "macaccess.sh" and put these lines:
iptables -A rdev01 -m mac --mac-source 00:8c:c3:de:67:8a -j RETURN #User Michael
iptables -A rdev01 -m mac --mac-source 00:1c:b0:df:12:44 -j RETURN #User Charlie
iptables -A rdev01 -j DROP
You can repeat the first line with mac ids of different users, whom you want to allow access, as many times you want. But the last line should come always last. One necessary thing you need to do is you need to enable "access restriction" in the tomato gui, and add MAC id of one user by selecting "allow these computers" from the drop down menu(This id done to enable access restriction so that the text file will work without any errors).
do this at the tomato ssh shell:
chmod +x /jffs/macaccess.sh
Add this line at "firewall script" at gui:
cd /jffs && ./macaccess.sh
reboot or restart the firewall with this command:
Currently my list contains 600 users, soon, in few months it will 1000!!!