] "We were able to identify the situation right away,"
] Russo said. "We are working with the (hardware) vendor to
] make sure it doesn't happen again."
]
] Russo on Wednesday said Tuesday night's outage was the
] result of an issue involving its domain name servers. She
] declined to identify Comcast's hardware vendor.

Of all things, DNS is something you'd expect Comcast to have a grip on. It is the single most important service your ISP offers you after actual IP transit..

Its always a good idea to keep a few DNS server IP addresses on hand for when these situations come up. Or a pre-configured copy of BIND installed.

New round of outages peeves some Comcast users | CNET News.com