Re: Two DSL lines - Cisco 1811 Router and Exchange MX Records Setup
- From: "Lanwench [MVP - Exchange]" <lanwench@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 14 Dec 2007 13:04:19 -0500
Chuckak <Chuckak@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I currently have a single DSL line with static IP connected to a
netgear VPN router and a single NIC SBS 2003 server. I just
converted Exchange to handle mail directly and had the ISP point the
MX record to my server's internet IP address. Exchange is working
fine so far.
We occasionaly have a DSL line go down so I have added a second DSL
line.
I have purchased a Cisco 1811 router that has two DSL line capability.
Correction - I think you mean it has two WAN interfaces (Ethernet) - it
shouldn't care that they're DSL. You have two DSL modems now...they'll
connect to each WAN interface.
How do I configure the Cisco 1811 to properly fail over to the
secondary DSL line or preferably load balance.
Sorry, that's really beyond the scope of a newsgroup post. If the Cisco
didn't come with sufficient documentation, you'll need to call them or get
someone in to help you. Personally, although I think Cisco kit is great, I'd
probably be inclined to return it, because it's pricy and I'm not sure how
you'll be able to use this with your Netgear device in the picture. Plus,
your Netgear really isn't sufficient protection anyway. I'd personally
recommend a SonicWALL running EnhancedOS, which can easily do load balancing
and failover as well as give you decent firewall protection.
And how do I handle the MX record at the ISP? Or is this all handled
in the router setup?
No - your router knows nothing about this sort of thing. MX records are
handled by whomever hosts your public DNS. If this is your ISP, then it's
them (I don't like having my domains hosted by ISPs as they aren't generally
very good at it, and it's uncommon to find one that lets you manage the
stuff yourself via a web-based control panel).
If the primary DSL line fails now I assume my incoming mail will die.
Your senders will retry delivery for 3, 5 days, on average - they'll ju
My ISP does not seem to be of any help here?
In your public DNS, presuming you've got the A record
blah.mydomain.com (xxx.xxx.xxx.xxx)
right now, and it's set as your primary MX record (e.g., preference 10), set
up another A record
blah2.mydomain.com (xxx.xxx.xxx.yyy)
and set it as your secondary MX record (e.g., preference 20)
.
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