Hmmm...using this version of firmware and am seeing the following messages in my router's log. I don't have an AP, just the rt-n66u router doing routing and wireless. I do have a WiFi adapter for my Verizon Network Extender, though, a Netgear WNCE2001:
Oct 1 01:12:16 kernel: eth1: received packet with own address as source address
Oct 1 01:58:16 kernel: eth1: received packet with own address as source address
Oct 1 03:20:16 kernel: eth1: received packet with own address as source address
Oct 1 03:41:08 kernel: eth1: received packet with own address as source address
Oct 1 05:37:13 kernel: eth1: received packet with own address as source address
Oct 1 06:24:57 kernel: eth1: received packet with own address as source address
Oct 1 06:26:43 kernel: eth1: received packet with own address as source address
Oct 1 07:38:59 kernel: eth1: received packet with own address as source address
Oct 1 08:28:53 kernel: eth1: received packet with own address as source address
Oct 1 10:20:55 kernel: eth1: received packet with own address as source address
Oct 1 11:53:02 kernel: eth1: received packet with own address as source address
Any ideas on what might be causing this? I've had these before in smaller quantities, this is a little disturbing.
One thing I would check is for any network device being connected twice to the network (for example, a laptop connected both over Ethernet and wireless at the same time).