So, which ISP is providing Tenda modem/routers to users?
From
http://www.geekzone.co.nz/forums.asp?forumid=49&topicid=119152
“I installed a Tenda W150D at a friends place 2 weeks ago and their internet usage jumped from 200-600MB/day to 2-15GB/day.”
This had default DNS responder, open web administration and telnet visible from the WAN side.
Cheers
Mauricio Freitas