On 7/2/13 9:35 AM, John Horne wrote:
On Tue, 2013-07-02 at 14:42 +0100, Sam Wilson wrote:
Can anyone here give examples of the types of various software that will
not operate without a PTR record?
Nope, and our entire reverse zone was externally inaccessible for many
months! (See previous posts on the bind9-users list from me about the
problem.) As far as we could tell no services blocked us because of a
failed reverse lookup. In fact it was one of the reasons we didn't
immediately spot the problem.
We were alerted to the problem because we got long delays (around 20
seconds) when accessing a site doing a reverse lookup. That service
then, no doubt the same as with SMTP, then proceeded but without the
reverse lookup answer.
John.
I have been reading all your concerns about reverse FQDNS. In my
example, we are a very small firm and I am the IT network admin
responsible for configuring our server. One of the reasons I configured
our server was because we deal with Photography, graphic design and
occasionally presentations of Movies. These are fat files that are not
viable to send thru emails. Our setup is far from being perfect and does
not follow the ISC BIND advised rules of how I would like to follow to
run a proper server. Like two different networks, one ip address for
every ns.mydomain.com and web services and so forth. Believe me, I would
love to do that if I had the budget for it. Therefore, that is not
really my decision but it falls under the way my ISP charges $$$ for
each ip address and reverse setup. So, I decided to work with what I
have and be happy with the limitations and at the same time try to work
around them. I put a lot of thought in the beginning about the issue of:
-Should I reverse my main NS or Should I just leave it alone since I do
not do any transfer or run any email server from my server. I thought in
the beginning; "Well, no spammer will attempt to relay through my server
since this will be one more reason they will not get things to work
properly." However, this is not really a concern. Like I said, my set up
is not perfect but everything works fine from my end so far with
limitations! …and Yes, I do occasionally have a very short delay between
the main "www.mydomain" and "mydomain" but the same delay never happened
with the other domains/websites I am running under the same ip address.
I guess I could reverse my main domain to my one and only static ip
address and my question would be: - Does that would affect the other
websites I am serving using the same ip address? Thanks everyone for
this wealth discussion!
Eduardo
--
Eduardo B
System - Network Admin
beart...@pacbell.net
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