Zhone Technologies 6218-I2 - Manual (Page 56)

Advanced Setup
56 6218-I2 Wireless Router User’s Guide 6218-A2-ZB23-10
If you want to add a setting to the MAC filtering table, enter the Source and
Destination MAC address, and select protocol type, frame direction, and
WAN interface. Then click on Save/Apply to save it.
Figure 52: IP Filtering - MAC Filtering Add Page