The following companies rely heavily on the Internet, gleaning everything from simple product information to product updates, critical security fixes, and so forth. One site with a chokepoint router, vulnerable to attack. Debian Well distributed servers. Both pass through 209.244.10.46 One site with a chokepoint router, vulnerable to attack. Two vendors stand out as having particularly poor DNS infrastructure.
Caldera maintains by far the worst, with only two DNS servers hosted at the same site.
In fact, this is the site that hosts most of their servers, email, FTP and so on. Essentially, they have a network link to their offices with all their infrastructure based there. If someone were to flood a router on that link, they could likely take out Caldera entirely DNS, email, secondary email, FTP, etc. Mandrake is another vendor with a poor DNS infrastructure. While not nearly as bad as Caldera's, Mandrake's is far from perfect.