I have to delete a previous post as the rant was off the target: I thought that at&t might be blocking ports entering my home. But the real problem turns out to be in the 2Wire gateway device -- more specifically, in its firewall settings. I forgot to check if my previous setting was changed. But anyway, resetting its firewall to expose the next router as a DMZ device -- which is where my port forwardings are configured -- has solved the problem.
At&t may still be to blame, as the firewall configuration change could not have happened by itself, but could have been the result of firmware upgrade in the gateway, or something like that.
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