Re: [cobalt-users] 2nd IP

[Jeff Lasman <blists@xxxxxxxxxxxxx>]

On Wednesday 17 March 2004 09:34 am, Manny Tau wrote:

> I imagine I can set the 550 up for this 2nd IP address, for various
> vsites and also run a secondary DNS (I know, same machine, but if it
> goes down, it won't matter anyways).

Not true.  It matters greatly.

If people try to send email to an IP# that's down, the sending server 
will continue to reply, usually for four days, usually notifying the 
sender of the delay after four hours.

But if all nameservers are down as well, the email will be returned to 
the sender with the permanent error that the domain doesn't exist.

Same thing with website visitors... if the machine is down the visitor 
will get a temporary error; if all nameservers are down the visitor 
will get a permanent "no such domain error".

I don't know of a single Internet professional who wouldn't consider 
that important enough to have slave DNS running somewhere else besides 
on the same server.

We've been slaving DNS for ourselves and for our clients in multiple 
worldwide DNS servers for years; it's actually quite easy.


Jeff
-- 
Jeff Lasman, nobaloney.net, P. O. Box 52672, Riverside, CA  92517 US
Professional Internet Services & Support / Consulting / Colocation
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Phone +1 909 324-9706, or see: "http://www.nobaloney.net/contactus.html";