question about reverse lookup
Brad Knowles
brad.knowles at skynet.be
Thu Sep 20 22:52:03 UTC 2001
At 4:57 PM -0500 9/20/01, Boex,Matthew W. wrote:
> we are having a mail problem with a domain. na.bestfoods.com. sendmail
> seems to be choking on it's reverse lookup. here is what i get when i run a
> dig na.bestfoods.com and dig -x on their ip address. correct me if i am
> wrong but isn't having an alias for a reverse ip bad, wrong? and could this
> be hosing sendmail?
No, the reverse delegation behaviour you're seeing is straight
out of RFC 2317 (see <http://www.faqs.org/rfcs/rfc2317.html>).
However, they don't appear to have gotten it quite right (this data
from DNS Expert Professional 1.6, see
<http://www.menandmice.com/2000/2100_dns_expert.html>):
DNS Expert
Detailed Report for bestfoods.com.
9/21/01, 12:50 AM, using the analysis setting "Everything"
======================================================================
Information
----------------------------------------------------------------------
Serial number: 16
Primary name server: dbru.br.ns.els-gms.att.net.
Primary mail server: brands.bestfoods.com.
Number of records: 23 (2 NS, 11 MX, 10 A, 0 CNAME, 0 PTR, 0
Other)
Errors
----------------------------------------------------------------------
o There are no MX records for the zone
The zone contains no MX records for the zone itself. This will
cause delivery problems for mail sent to any account of the form
user at zone. Every zone for which mail delivery is desired should
contain at least one MX record.
o The reverse record "10.0/26.84.14.12.in-addr.arpa." does not refer
to the host "na.bestfoods.com."
The reverse record "10.0/26.84.14.12.in-addr.arpa." refers to
"www.prodmaiz.com.", but it should refer to "na.bestfoods.com.".
o The reverse record "10.0/26.84.14.12.in-addr.arpa." does not refer
to the host "wss3.na.bestfoods.com."
The reverse record "10.0/26.84.14.12.in-addr.arpa." refers to
"www.prodmaiz.com.", but it should refer to
"wss3.na.bestfoods.com.".
o There is no PTR record for the host "wss1.asia.bestfoods.com."
There is no PTR record available for the host
"wss1.asia.bestfoods.com." which has the IP address 168.70.234.97.
o There is no PTR record for the host "wss2.asia.bestfoods.com."
There is no PTR record available for the host
"wss2.asia.bestfoods.com." which has the IP address
168.70.234.126.
o There is no PTR record for the host "nordic.bestfoods.com."
There is no PTR record available for the host
"nordic.bestfoods.com." which has the IP address 194.52.178.236.
o There is no PTR record for the host "www.stars.bestfoods.com."
There is no PTR record available for the host
"www.stars.bestfoods.com." which has the IP address
199.170.229.246.
o There is no PTR record for the host "www.bestfoods.com."
There is no PTR record available for the host
"www.bestfoods.com." which has the IP address 199.248.129.22.
o Lame delegation received from "dns01.unilever.com." for
"129.248.199.in-addr.arpa."
The server "dns01.unilever.com." is listed as being authoritative
for "129.248.199.in-addr.arpa.", but "dns01.unilever.com." does
not contain authoritative data for the zone.
o Lame delegation received from "dns02.unilever.com." for
"129.248.199.in-addr.arpa."
The server "dns02.unilever.com." is listed as being authoritative
for "129.248.199.in-addr.arpa.", but "dns02.unilever.com." does
not contain authoritative data for the zone.
o There is no PTR record for the host "brands.bestfoods.com."
There is no PTR record available for the host
"brands.bestfoods.com." which has the IP address 199.248.129.23.
o The server "dns1.3rdst.com." did not reply
The server "dns1.3rdst.com." did not reply when it was queried
for the name "211.128-25.185.175.216.in-addr.arpa.". This
indicates that the server is not running, or it is currently
unreachable.
o The server "dns2.3rdst.com." did not reply
The server "dns2.3rdst.com." did not reply when it was queried
for the name "211.128-25.185.175.216.in-addr.arpa.". This
indicates that the server is not running, or it is currently
unreachable.
Warnings
----------------------------------------------------------------------
o Lame delegation received from "ns-east.cerf.net." for
"san.cerf.net."
The server "ns-east.cerf.net." is listed by "ns-east.cerf.net."
as being authoritative for "san.cerf.net.", but
"ns-east.cerf.net." does not contain authoritative data for the
zone.
o The Retry field in the SOA record contains an unusually high value
The value 10000 of the Retry field in the SOA record is unusually
high. The value for this field should be within the range 300 -
7200.
o The zone contains more than one A record with the address
194.52.178.236
There is more than one A record in the zone with the IP address
194.52.178.236.
o The zone contains more than one A record with the address
12.14.84.10
There is more than one A record in the zone with the IP address
12.14.84.10.
o The zone contains no A record with the zone name
There is no A record in the zone with the zone name
"bestfoods.com."
o Lame delegation received from "dns02.unilever.com." for
"129.248.199.in-addr.arpa."
The server "dns02.unilever.com." is listed by
"arrowroot.arin.net." as being authoritative for
"129.248.199.in-addr.arpa.", but "dns02.unilever.com." does not
contain authoritative data for the zone.
o Lame delegation received from "dns01.unilever.com." for
"129.248.199.in-addr.arpa."
The server "dns01.unilever.com." is listed by
"arrowroot.arin.net." as being authoritative for
"129.248.199.in-addr.arpa.", but "dns01.unilever.com." does not
contain authoritative data for the zone.
---------------------------------------------------
--
Brad Knowles, <brad.knowles at skynet.be>
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