HI,
routers get dhcp leases even if there is an ip address on the interface. Here is a screen shot of 751. I feel this problem is found on all the routers 2011, 751, 450. The wan is free from any bridge shared by other ports. Even though dst 67 src 68 udp is blocked but still the interface gets dhcp lease

<img src="http://imageshack.us/a/img198/3337/screenshottk.jpg" alt="Image Hosted by ImageShack.us"/><br/>Shot at 2012-09-16

75xxxx series seems to share physically same hw of eth1 to eth5
I just got news

mt-450...ubnt...........ubnt.............wan(eth1)-751.....lan-751(eth5)hotspot
hotspot users logging requests are going to mt-450.


Apart from that high cpu usage on management because of snmp. This problem is experienced by many others

thanks