Leonard Mills wrote:
>If your some of your clients are SMTP relays, then ANY is the default
>lookup for an MX and is perfectly normal.
>
Not correct. This is only done by some brokenware. The vast majority of mtas do
correct MX and a/ lookups.
And as has been pointed out elsewhere in the t
Quite correct (sorry for the top post). I'm surprised, but glad to have learned
something. The only difference in the cases I do are that they're MS DNS and
the zones I normally use that trick for are forwarded.
- Original Message -
From: Barry Margolin [mailto:bar...@alum.mit.edu]
Se
In article ,
"Novosielski, Ryan" wrote:
> If it were not already in the cache, I would not need to refresh the cache.
> Are you absolutely certain? If so, it is possible that this is a difference
> between BIND and AD DNS (I'm generally trying to refresh AD DNS caches), but
> I'm nearly certa
If it were not already in the cache, I would not need to refresh the cache. Are
you absolutely certain? If so, it is possible that this is a difference between
BIND and AD DNS (I'm generally trying to refresh AD DNS caches), but I'm nearly
certain I've used this to update a cached entry on a BIN
In article ,
"Novosielski, Ryan" wrote:
> Not in my experience -- in fact, I often do an ANY query to refresh the
> cache.
That will work if the name is not currently in the cache -- the caching
server will query the auth server, and get everything from there.
But if it already has the name
Not in my experience -- in fact, I often do an ANY query to refresh the cache.
From: Chris Buxton [mailto:cli...@buxtonfamily.us]
Sent: Monday, June 03, 2013 08:47 PM
To: Leonard Mills
Cc: bind-users@lists.isc.org
Subject: Re: any requests
If you have mail relays acting this way, you'd better
If you have mail relays acting this way, you'd better give them a dedicated DNS
server to use for recursive lookups, because otherwise that's going to
periodically fail.
If a host has both an MX record and an A record, and if the A record is in
cache, the ANY lookup will just get the A record,
If your some of your clients are SMTP relays, then ANY is the default lookup
for an MX and is perfectly normal.
Much better from the point of view of the mail servers to do one lookup instead
of several.
Len
>
> From: hugo hugoo
>To: Vernon Schryver ; "bind
On Jun 3, 2013, at 4:31 PM, John Miller wrote:
> Hi Mike,
>
> To keep my answer simple, if BIND is set up to allow recursion, and gets a
> recursive query for a zone it's not authoritative for, it'll:
>
> 1) Answer from cache
> 2) pass the query off to the configured forwarders
> 3) If the fo
The point of being authoritative is to have a full copy of the zone, so
that one is basically autonomous, not dependent on anyone else to
resolve names in the zone. In BIND terms, that means "type master" or
"type slave". That's why authoritative zones "override" forwarding,
since forwarding is
Hi Mike,
To keep my answer simple, if BIND is set up to allow recursion, and gets
a recursive query for a zone it's not authoritative for, it'll:
1) Answer from cache
2) pass the query off to the configured forwarders
3) If the forwarders are unavailable, follow delegation itself to answer
th
In article ,
hugo hugoo wrote:
> Hello,
>
> Thanks for your answer.
> I see ANY queries from my clients (we do not use open resolvers)
That's strange. Client applications shouldn't use ANY queries, because
you can't be sure of which record types are in the resolver's cache.
I recall reading
If the records which are being requested are in the DNS server's cache
then it may return the records directly from cache (depends on your
configuration). If the record isn't in the cache it will attempt to
fetch it and return it to the client, it will then be placed in the
cache so subsequent quer
Why would you use forwarding over links that are "neither fat nor
reliable"? Are you a masochist? Replication of the data is much
recommended over such links...
As for your "pecking order", what distinction are you drawing between
forwarding and recursion? Forwarding is recursive. The high-lev
Hello all, I was trying to follow the thread on the NXDOMAIN and got lost. :) I
have a question about using forwarders. If the DNS that is using forwarders
receives a query for a zone it's not authoritative for even if it's in the same
network, does it go to the forwarders for zone information?
Hello,
Thanks for your answer.
I see ANY queries from my clients (we do not use open resolvers)
I do not see why these kind of queries are present.
Moreover, the cache servers only anbswer with its cache content.
Is this normal or must the cache query the authoritztive server to fetch all
the
I agree with Len. Whenever we merge a new location into our network, and the
circuit is neither fat nor reliable, I make their DNS forward queries for our
internal zones to us, keep authority for their own zones, and do recursion for
everything else. This allows us to serve the users as we slowl
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