Just a quick idea, do you have any cordless phones near the router? They can 
interfere with the signal on an intermittent basis.


>> Okay, so for my own education (because I'm clueless about this stuff),
>
>No - sorry, I missed that.  Interference would affect the base signal so
>that all services would be dead equally.
>
>Definitely sounds like a network layer issue, not a connection layer issue
>from what you've said.
>
>The clichéd answer is always to look for new firmware (both for the router
>and the card).
>
>You might also keep a small collection of IP addresses on hand - when the
>Internet goes out try connecting by IP address directly.  If you can then
>you know that it's actually DNS that's gone out, not all external
>connectivity.
>
>Also when it does go out see if a reboot of the router "solves" it - it may
>be grabbing a new IP address periodically (some providers do this to
>discourage home servers) and when it does you might be out until the client
>machines notice and re-cache DNS.  Rebooting the router sometimes kicks this
>process in the pants.
>
>Jim Davis

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