Re: Two ISPs - Which SMTP?
- From: Joe <joe@xxxxxxxxxxxxxx>
- Date: Mon, 14 Jan 2008 17:45:05 +0000
John F Kappler wrote:
I'm trying to plan for a transition to a new location and the current
location has two ADSL lines connecting to a Draytek load balancing
router.
Whilst the ADSL lines are being moved to new landline numbers, we
intend to use a 3G modem for the router.
However, its quite likely traffic will be heavy so it may be that we
will have one ADSl line (to ISP A) as well as the 3G modem to ISP B
both active on the router at the same time.
My question is, how do I ensure our SBServer is sending mail to the
correct SMTP server?
If you're already authenticating, or if the SMTP server can be accessed using authentication, it probably doesn't matter, they will likely accept authenticated mail from anywhere.
If it does matter, then it may get a bit messy. I've never used a load balancer, but it seems reasonable that there will be some method of overriding its decisions, if only by static routing. You may need to track down the SMTP server IP address(es), and use it/them for routing. It's not recommended long-term, as ISPs routinely replace servers, but it should be OK for a short period.
Presumably this is only for a few days, after which both DSL lines will lead to the same ISP?
.
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