Real Newbie question (correcting my post)

[David Botham]

> -----Original Message-----
> From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org] On
> Behalf Of System
> Sent: Thursday, February 20, 2003 9:24 AM
> To: bind-users at isc.org
> Cc: David Botham
> Subject: Re: Real Newbie question (correcting my post)
> 
> Thank you all for all the support I am getting.
> 
> While looking for the same in google I came accross DNS round robin.
It
> says
> that I can have multiple A records for my website. So that if my one
> server
> fails the other will reply for the website request. I am still not
clear
> about this and little bit confused. Can anyone clear the picture for
me.

Yes, round robin will send out both A records for your site.  Remember
that each of those A records has a TTL.  So, other people will remember
those A records for the TTL.  Now, let's say you are using a TTL of 1
day.  And someone gets the A records in question for both of your web
servers now.  Then, in 10 minutes one of your web servers goes down.
You can't contact every name server on the planet that has both A
records cached.  Therefore, some people are going to be attempting to
contact the down server for almost a whole day.  It is also important to
remember that only one of the A records is going to be used.  There is
nothing in the HTTP protocol that says "if one of the A records does not
work, try the others".  The Mail Exchanger records work this way though.



Dave...


> 
> Thank you,
> 
> Tina.
> 
> ----- Original Message -----
> From: "David Botham" <dns at botham.net>
> To: "'System'" <system at eluminoustechnologies.com>;
<bind-users at isc.org>
> Sent: Thursday, February 20, 2003 7:36 PM
> Subject: RE: Real Newbie question (correcting my post)
> 
> 
> 
> 
> > -----Original Message-----
> > From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org]
On
> > Behalf Of David Botham
> > Sent: Thursday, February 20, 2003 8:46 AM
> > To: 'System'; bind-users at isc.org
> > Subject: RE: Real Newbie question
> >
> >
> >
> > > -----Original Message-----
> > > From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org]
> On
> > > Behalf Of System
> > > Sent: Thursday, February 20, 2003 6:12 AM
> > > To: bind-users at isc.org
> > > Subject: Real Newbie question
> > >
> > > Hello All,
> > > I know this is a very basic question i am asking. but can't help:(
> >
> > It is OK to ask basic questions.  DNS and BIND, 4th Edition is a
good
> > book to have on the shelf.  It will help you to start asking harder
> > questions :)
> >
> > >
> > > See i have a domian a.com.
> >
> > I seriously doubt you own that domain, but, let's pretend for this
> > example :)
> >
> > >
> > > Is it possible to use the Nameserver Records of different servers
> i.e.
> > >
> > > a.com  NS  ns1.aaa.com
> > > a.com  NS  ns2.aaa.com
> > > a.com  NS  ns3.bbb.com
> > > a.com  NS  ns4.bbb.com
> >
> > Yes, this is perfectly legal and often the case.
> >
> >
> > >
> > > so if ns1.aaa.com and ns2.aaa.com fails will my domain be resolved
> > with
> > > ns1.bbb.com ????
> 
> After reading Pete's more careful posting; No.  I of course mis-read
> this to be ns3.bbb.com.
> 
> 
> >
> > Yes.  Hence the reason to have *at least* two name servers, if not
> > more...
> >
> >
> > Dave...
> >
> > >
> > > or is this possible???? what would be the solution for this?
> > >
> > > Rgds,
> > > Tina.
> > >
> >
> 
> 
> 
> 
> 
> 
>