Did I hear someone say "fault tolerant" and "NT 4.0" ????
LOL!!!
"Richard Chang" wrote ..
> I discussed fault tolerance a lot before with customers who has a web site
> that would like to be up all the time using DSL lines. As far as I can
tell,
> there is just no easy way to achieve a high-level of fault tolerance
without
> running some kind of dynamic routing protocols with your ISP.
>
> Your idea of using two DNS servers won't work. When anyone tries to send an
> email, their smtp server will randomly pick one of the authorized name
> server requesting for your IP address. Therefore, you would still have 50%
> chance of failure if one of the DSL is down. I would recommend that you get
> some kind of load balancing device in front of these two DSL lines. Or, if
> mail is all we are concerned about, you could assign one IP from ISP A as
> the primary MX record while use IP from ISP B as a backup MX record. That
> will make sure your mail always get to the exchange server.
>
> BTW, I would not recommend using a second DSL line to backup another DSL
> line since both DSLs would probably go into the same DSLAM in the same CO
> anyway...
>
> Richard
>
> ""Steven V. Snead"" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Load balancing would be nice but my real goal would be to have Fault
> > tolerance on my NT 4.0 box. Fault tolerance between the two DSL
> > connections, such that if one DSL fails, it will switch over to the other
> > DSL, so that the exchange server still receive mail. My thought was to
> use
> > two DNS servers the primary pointing to one IP and the secondary pointing
> to
> > another IP from the other DSL circuit. I'm a little lost on how that can
> be
> > set up on the server end. Two NIC cards ? I guess I need hardware but
> would
> > like to do it without NAT. I can't believe this is something that can't
be
> > done and hopefully without BGP because working with the ISP seems
> impossible
> > for this to happen.
> >
> > Thanks,
> >
> > Steven V. Snead, MCSE, MCP+I, CCNA
> > [EMAIL PROTECTED]
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