I've been experiencing frequent drops in connection (around 13 in the past 48 hours..Comcast of course) and found that any time I do drop, I can't get into my modem's diagnostics page (192.168.100.1). I know it's my cable connection and not anything else because the cable light goes out on my modem . It's a Linksys BEFCMU10 ver3. As soon as my cable connection comes back, I can get into the diag page.
In an attempt to see if it was the modem, I had a Motorola SB5120 set up. Experienced the same thing. Continued disconnects and the inability to connect to it's diagnostics page through the private IP.
Why on earth would I not be able to connect to my modem through the private IP?