does DD-WRT offer port isolation on older Atheros chipset routers?

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Does DD-WRT for Atheros chipset routers support either "port isolation"
or multiple LAN subnets (by port)?  I'd like the router to have a
"guest" Ethernet port (only able to communicate with the WAN, but
protected, not an open/DMZ host).

Thanks!
 -WBE

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