Hi guys, I have this same problem with the DIR-601 firmware version 2.00NA
Let me tell you the history of my problem. The router worked perfectly since I bought it in early May from Office Depot, then about three weeks ago I encountered a couple of 404s. I thought this was weird, because the internet was working, it just wasn't working for certain web sites. I figured it was a DNS error and I was going to use Google DNS servers to see if that's the case but it fixed itself and I didn't need to.
Now today a third user in addition to the two usual users of this wireless network has arrived and suddenly this 404 message pops up again. As soon as this third user stopped using the internet, the 404s disappeared. Needless to say, this is really annoying.
I've dealt with a lot of routers and wireless networks over the years and I usually have a decent time. When something goes wrong, there's usually a logical reason for it, say, a lose ethernet cable or something. Here, there isn't really a logical reason.
I'm using cable internet, and my router is attached to a cable modem. When I plug straight into the modem the internet is generally flawless.
Anyways I'm not sure what to do here, I did a cursory look through the settings and checked my firmware but I'm out of options. I hope this problem does not re-occur but if it does then I have preemptively made a post here.
Time: Jan/18/2011 02:35:30
Firmware Version :2.00NA,Fri, 1 Jul 2011
Connection Type: DHCP Client
Cable Status :Connected
Network Status :Connected
Connection Up Time :1 Day, 08:04:35
802.11 Mode :Mixed 802.11n, 802.11g and 802.11b
Channel Width :20 MHz
Channel :1
Security Mode :Auto (WPA or WPA2) - Personal
Wi-FI Protected Setup :Enabled / Configured
I have the DIR 601 Hardware Version B1.