That is correct, make the secondary something like 10 and the primary
something like 5. The second will never be looked at as long as DNS can find
the first...
----- Original Message -----
From: "Sanford Whiteman" <sa...@cypressintegrated.com>
To: "Kevin Rogers" <Imail_Forum@list.ipswitch.com>
Sent: Sunday, January 25, 2009 1:54 PM
Subject: Re: [IMail Forum] Off Topic - Dual Connections
my MX record and then in my A record add "backup.mydomain.com" to point
to the RCN static IP? I would set that up with a higher priority number
so it only gets accessed when my primary MX record (which points to my
Covad IP) is down. Would that work?
For inbound, yes, since MX failover is built in to the MX algorithm).
The bigger problem is outbound mail. Even if you manage to get working
dead gateway detection so that outbound packets go out your RCN link
if Covad is down (many cheapish routers can make sure this part
works), you have to make sure that the mailserver's public IP on the
RCN link has a PTR record matching its HELO -- and that PTR can't be
in a known subscriber range or have be a suspicious subscriber-like
hostname (1-2-3-4-cable-consumer.rcn.net).
If you can get the PTR-EHLO-A "roundtrip" working on your backup link
so you can have reliable outbound delivery in a failover state, then
you should be okay.
As Darin said, this does not account for any attempt to balance
inbound HTTP over the 2 links; if you can automate DNS updates (by
running your own DNS, or at least your own stealth primary DNS) this
can, albeit roughly, be accomplished.
And I don't disagree with the recommendation of just moving anything
this sensitive to a datacenter! :) But there are indeed ways of
getting it done at home in a rough sense for a few $ (dual-WAN router,
Draytek for example). Just a matter of how much energy you want to
spend, and what kind of guarantees you can make to your clients.
--Sandy
------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
e-mail: sa...@cypressintegrated.com
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