two subnet''s?

Re: two subnet''s?

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>Is there an archive of this mailing list somewhere? If yes, I can't seem
>to find it.

I haven't been able to find one, either.

>Given two subnet's, what are most people here doing to dynamically route
>traffic to a backup net connection when something goes wrong?

I've never dealt with multiple subnets. All I can do is guess.

>Apparently the ideal solution is BGP, but BGP likely isn't an option.
>What's the best alternative?

I'm not real up on BGP, but from a cursory look it appears to require both
of your providers to route to the same subnet. You're talking about two
different subnets.

>I'm currently thinking about placing the secondary QuickDNS server on the
>backup subnet, but there's two problem's with this:
>
>1. Current visitors have already cached the web server's IP address, so
>it's only good for new visitors.

That's where a BGP solution would work, because you'd have two ways in to
the same network numbers.

>2. For some reason our secondary DNS server get's a lot of traffic. We
>don't want the backup subnet getting this traffic all the time.

Your servers are <ns.retort.com> and <ns1.retort.com>. The root servers
appear to report them in alphabetical order, sorting numbers before
letters. I'm not sure if that's a feature of the root servers, or if
they've just been entered in that order. Since they're on the same subnet,
they're the same distance away from any name resolver, so the name resolver
chooses the first one it finds. That's why the secondary gets more traffic.

>Anyone have an opinion on adding a 3rd backup DNS server to the backup
>subnet, while keeping the primary and secondary on the main subnet?

This might work. Assuming your new subnet is "further away", in terms of
net hops, from most addresses, it should see considerably less traffic. If
only the third server has the alternate address for your web server, then
only those clients that query this name server would use the backup
connection to get to your web server.
________________________________
Chris Buxton
Internet and Database Consultant

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