Gotcha... But I don't recall seeing that at other hosts. Generally, when you pay for an IP number, you pay for a static one. If moves are made, the number moves with you. Machine moves are usually within the same data center, so it's usually not a problem.
And that's exactly what I do...
Me neither. That's why I tend to write them down.
I have seen DNS problems (Net-wide and more local to another host) last for a day or more, during which I was able to continue working on a website under development by using the IP number. If I hadn't had a static IP number (at least static for that period of time), I would have lost those days of development time.
Naturally, the public generally won't know the IP number of a certain site, but if you're working on a site, or others you work with need access when DNS is down, that number is important.
That's clear now. Thanks.
And that's what is called "multihoming", IIRC (the admins may call it something else, but from what I understand, that's what it's called). Multihoming is when single IP number serves more than one machine, or more than one domain on a machine.
And... Yes, from what I can see, this would have to be where the problem lies.
Once you get past the DNS stage, and past the IP stage, you're into multihoming. If the server is reachable by IP number and by regular DNS using machinename.dreamhost.com, but isn't reachable via example.com, the only stage that's left is the multihoming setup. That's the stage -- the "name-based hosting" stage -- at which requests coming into a single IP, but for different domain names, are guided to the proper machines and/or directories for those domains.
No, you've explained it clearly this time.
But I do believe you're mistaken about multihoming not being the problem. As far as I can tell, it's the only possible point of failure. Whether it's a hardware problem, an NFS problem, or whatever, it's ocurring during the multihoming stage.
What else could it be, given the symptoms?
(BTW-- Let me know if you want to take this conversation to another forum...)