Re: Does Exchange support ODMR?

From: Steve Foster [SBS MVP] (steve.foster_at_picamar.co.uk)
Date: 05/13/04 

Date: Thu, 13 May 2004 06:49:36 -0700

Andrew H wrote:

> First noticed it on SBS 4.5, and it didn't go away with the upgrades
> to SBS 2000 and 2003. With 4.5, my suspicion was on the MTU settings
> - if I tweaked them low enough, some more mail got through, but there
> was always a proportion that just disappeared, and the event log
> showed lots of SMTP connections initiated that never terminated.
> However, the KB's implied that 4.5's (or NT 4.0's) sensitivity to MTU
> settings was resolved with 2000 which could better handle
> auto-negotiation, and the event logs didn't show the same symptoms.

Never seen anything like that. Wonder if there's any commonality in the
mail server software on the remote ends (eg all using some duff old
version of sendmail), or some other common factor.

> Somebody suggested the problem might lie with the various sender's
> ISP's sendmail systems (they all use *n*x) being incorrectly set up,
> but we gave up on trying to get any co-operation from all the ISP's -
> their attitude was "it's an Exchange problem, and we don't do
> Exchange".

Well, duh. ISPs are generally about as much use as a chocolate teapot.

> Not really - the IPs changed typically once every couple of days, as
> expected. Of course, we can't tell if the ISP broke connection for a
> few seconds and then gave us back the same IP, but my assumption is
> that the SMTP protocol could cope with a brief interruption and just
> retry later. And the DDNS service providers (NO-IP.com and
> DynDns.org) always seemed to live up to their advertising in keeping
> the global DNS system up to date, so I can't complain there. And
> from what we could see with our tests, the backup MX service provided
> by the DDNS guys worked fine too - mail sent while our servers were
> down was delivered when the servers came up again.

So, fundamentally if your IP wasn't changing very often, it sounds more
like a straight-forward connectivity problem. On which assumption, I'd
be looking for common factors - were you using the same network
equipment throughout? 

-- 
Steve Foster [SBS MVP]
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