----- Original Message -----
From: "Meng Weng Wong" <mengwong(_at_)dumbo(_dot_)pobox(_dot_)com>
To: <spf-discuss(_at_)v2(_dot_)listbox(_dot_)com>
Sent: Saturday, February 21, 2004 10:54 AM
Subject: Re: [spf-discuss] DMP vs SPF
On Sat, Feb 21, 2004 at 07:16:30AM -0500, Hector Santos wrote:
|
| SPF itself has added atleast 1 to 3 seconds to the session time. But
the
| high delays are way too high with DMP to further ignore.
|
Hector, I really believe there is a serious problem in your DNS stack.
I had (and still have) some concern in this area too. However, it is all
intermittent so I am not sure. More below.
If I read this correctly,
- the SPF lookup takes 6.5 seconds to return
- the DMP lookup takes 7.7 seconds
- the dsbl lookup takes 2 seconds
Correct.
On my system, even with the overhead of loading Perl, then doing the
lookup, then parsing the result, SPF takes 0.056 wall-clock seconds.
Correct, same here. That would be the first time lookup where I'm seeing
the delays. Absolutely. The following is someone here using the web based
tester 3 times and the lookup time result (no need to show the user info)
20040221 08:26:57 000134a6 sapspf : pass (time:5281)
20040221 08:27:42 000134ab sapspf : pass (time:0)
20040221 08:27:59 000134ac sapspf : pass (time:0)
So it is can be very fast when cached. But as I stated a few times, most
spammer hits are random domains (valid or not), so your lookup is usually a
first time lookup.
What I have yet to fully comprehend or pin-point is whether there is a
problem with our network DNS setup as a primary server with with T1 provider
uunet as our uplink or this is a general non-authoritive" lookup issues
depending on the domain. When I work from home on my DSL line (like now),
I see the same type of behavior. It really all depends on the domain.
Again, I don't claim to be a DNS expect but I continue to research why this
is a issue. I will have our network engineer check out the DNS server once
again come monday.
Question, some TXT lookups have a non-zero TTL assign to it. How do you
get a non-zero TTL assigned to a TXT record?
--
Hector Santos, Santronics Software, Inc.
http://www.santronics.com