Re: redundancy via DNS
I mentioned "hardware solutions" in my email...
however, the cost of these hardware appliances is pretty high. In theory,
you can do the same thing with a properly configured linux server at less
than half the price. Of course... the money is in the configuration ;-)
Sincerely,
Jason
----- Original Message -----
From: "Ken Seefried" <ken@seefried.com>
To: ":yegon" <yegon@yegon.sk>
Cc: <debian-isp@lists.debian.org>
Sent: Sunday, June 17, 2001 10:33 PM
Subject: Re: redundancy via DNS
>
> There are a number of very effect "appliance" style solutions to doing
this.
> Please have a look at RadWare (WSD) and F5 Networks (3DNS); I have had
great
> success with both companies. The bonus is that these solutions can
> automaticly determine if a server is up.
>
> Ken Seefried, CISSP
>
> :yegon writes:
>
> > we have several servers colocated with several ISP's
> > i am trying to sort out some configuration that would ensure good
uptime for
> > customers
> >
> > i want to place the html documents of every customer on two separate
servers
> > connected to separate ISP's
> > the dns servers will point to one server and the second one will be
just a
> > backup, in case the main server goes down we just change the DNS and
point
> > the affected domains to the backup server. when the main server is
back up
> > the dns changes back to normal
> >
> > and now my questions:
> > 1. what should the times in zone files be set to to enable the dns
change to
> > be propagated very quickly, say 5 minutes max.
> > is it possible/wise to use TTL=0
> >
> > 2. if a domain has 2 name servers set during registration, are both of
these
> > servers used for lookups? Or is it so that just the primary is
querried if
> > it works, and the secondary is querried only if the primary is not
> > responding?
> >
> > 3. is this whole idea worth consideration anyway or should I forget
it?
> >
> >
> > thanks for answers
> >
> > Martin Dragun
> >
> >
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