Re: SPF = Sender Policy Framework (was: Microsoft spam solution<snip>)

From: Bill Cole (bill_at_scconsult.com)
Date: 09/20/04 

Date: Mon, 20 Sep 2004 07:45:48 -0400

In article <pan.2004.09.20.05.44.32.396471@yahoo.com>,
 Dave Uhring <daveuhring@yahoo.com> wrote:

> On Mon, 20 Sep 2004 05:02:55 +0000, Randolf Richardson wrote:
>
> > Regardless of how I configure my DNS zone to return a different IP
> > address for "netware.inter-corporate.com," the root servers will override
> > this by providing the information specified in the host record. This also
> > seems to speed up DNS resolutiona little bit, by the way, because the root
> > servers don't have to take addition steps to look up external NS records.
>
> I also think that someone is putting something over on you:
>
> Non-authoritative answer:
> Name: netware.inter-corporate.com
> Address: 24.87.56.253
>
> Authoritative answers can be found from:
> inter-corporate.com nameserver = netware.inter-corporate.com.
> inter-corporate.com nameserver = oc48.inter-corporate.com.
> inter-corporate.com nameserver = fast01.inter-corporate.com.
> oc48.inter-corporate.com internet address = 64.251.89.8
> fast01.inter-corporate.com internet address = 64.251.89.88
>
> Suppose you turn off those three DNS servers and then attempt to resolve
> some host whose zone records are maintained there.

No need to do that, all I need to do is ask a gTLD root and make sure it
doesn't try to help me too much:

; <<>> DiG 9.2.3 <<>> +norecurse @a.gtld-servers.net
netware.inter-corporate.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17684
;; flags: qr; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3

;; QUESTION SECTION:
;netware.inter-corporate.com. IN A

;; ANSWER SECTION:
netware.inter-corporate.com. 172800 IN A 24.87.56.253

;; AUTHORITY SECTION:
inter-corporate.com. 172800 IN NS
fast01.inter-corporate.com.
inter-corporate.com. 172800 IN NS
netware.inter-corporate.com.
inter-corporate.com. 172800 IN NS oc48.inter-corporate.com.

;; ADDITIONAL SECTION:
fast01.inter-corporate.com. 172800 IN A 64.251.89.88
netware.inter-corporate.com. 172800 IN A 24.87.56.253
oc48.inter-corporate.com. 172800 IN A 64.251.89.8

;; Query time: 163 msec
;; SERVER: 192.5.6.30#53(a.gtld-servers.net)
;; WHEN: Mon Sep 20 07:41:08 2004
;; MSG SIZE rcvd: 163

So, without anyone talking to those 3 nameservers, I have address
records for each of them. If I was really only trying to resolve one of
them, I would never get to the point of querying them directly. 

-- 
Now where did I hide that website...

Relevant Pages

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