After googling tons of time, I found that there is something wrong with a firmware version 4.21.1. And when I visited Linksys homepage, I found that there was no more 4.21.1. Ridiculous! The latest firmware version they offer is 4.20.8. I downgrade my firmware version and it works so far. But I can't explain this mystery, where on earth that 4.21.8 came from.
Posted by 망고
