On Thu, 12 Jul 2001, Charles Steinkuehler wrote:
> > I know there's been lots of discussion about 'load balancing' in the past,
> > over two similar link types.
> >
> > I want to do something a little different but in the same vein. Our
> company
> > currently has a 2mb ADSL line, and for the most part it works great.
> > However, we might be taking on a leased line in the future, as we have a
> > mailserver/transaction server that we would like to ensure is always
> online.
> > (Always is a relative term, of course, compared to the DSL!). This will
> > probably only be 64k though.
> >
> > Anyway, what I would like to do is ensure all WWW/outgoing mail/downloads
> et
> > al goes over the 2mb line (fast, no bandwidth charges!) but the
> 'important'
> > traffic (incoming mail, incoming www requests) goes over the leased line.
>
> This much you can handle with proper network setup. Your DSL internface and
> leased line will presumably have seperate IP addresses, so just setup your
> firewall rules so the internal network masquerades to the internet on your
> DSL line, and provide the IP of your leased line in DNS lookups for your www
> & inbound mail address.
>
This only works if all traffic to/from his mail and web servers goes
over the leased line. MX records could be used to handle incoming mail,
but incoming www can't failover unless the users use different names.
You might also use A record round-robins, in which case only half of the
connect attempts will fail when one of the lines is down.
> > Also if the DSL line fails, everything needs to go over the leased line.
>
> There are several folks who have setup fail-over (or at least talked about
> it). IIRC, the typical method is to have a script ping your DSL gateway
> periodically. If it becomes unreachable, the firewall rules are
> re-configured to masquerade internal traffic out the secondary interface.
> Search the list archives for details...
>
> Charles Steinkuehler
> http://lrp.steinkuehler.net
> http://c0wz.steinkuehler.net (lrp.c0wz.com mirror)
>
>
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--
Jack Coates
Monkeynoodle: It's what's for dinner!
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