Mailing List SIMS@mail.stalker.com Message #7422
From: Jay Towslee <towslee@gearboy.com>
Subject: DNS Loops and MX records
Date: Sun, 17 Dec 2000 00:34:55 -0800
To: <sims>
related to the following scenario

The error code -15010 means "DNS loop".
In your case:

[dimak@node6 dimak]$ nslookup -type=MX musick8.com
Server: localhost
Address: 127.0.0.1

musick8.com preference = 10, mail exchanger = popmail.spsp.com

[dimak@node6 dimak]$ nslookup -type=A popmail.spsp.com
Server: localhost
Address: 127.0.0.1

Non-authoritative answer:
Name: ns1.spsp.com
Address: 204.95.207.52
Aliases: popmail.spsp.com, khepera.spsp.com

aha, possible alias (CNAME)

dimak@node6 dimak]$ nslookup -type=CNAME popmail.spsp.com
Server: localhost
Address: 127.0.0.1

Non-authoritative answer:
popmail.spsp.com canonical name = khepera.spsp.com

Indeed, we have the "MX on CNAME" situation here - prone to problems when MX
is resolved through DNS.

Fix: make the MX record for musick8.com to point to A record, rather than
CNAME.

OK...

I've tried

purple-hand.org. IN SOA  ns1.gearboy.com. hostmaster.gearboy.com. (
2000121601; serial
28800; refresh
7200; retry
604800; expire
86400; minimum
)
purple-hand.org.        86400   NS      ns1.gearboy.com.        ;
purple-hand.org.        86400   NS      ns2.gearboy.com.        ;
purple-hand.org.        86400   MX      10      pobox.gearboy.com.      ;

gearboy.com. IN SOA  ns1.gearboy.com. hostmaster.gearboy.com. (
2000092302; serial
28800; refresh
7200; retry
604800; expire
86400; minimum
)
gearboy.com.    86400   NS      ns1.gearboy.com.        ;
gearboy.com.    86400   NS      ns2.gearboy.com.        ;
gearboy.com.    86400   MX      10      pobox.gearboy.com.      ;
ns1.gearboy.com.        86400   A       216.127.79.181  ;
ns2.gearboy.com.        86400   A       216.127.79.178  ;
pobox.gearboy.com.      86400   A       216.127.79.181  ;
gearboy.com.    86400   NS      ns1.gearboy.com.        ;
gearboy.com.    86400   NS      ns2.gearboy.com.        ;
gearboy.com.    86400   MX      10      pobox.gearboy.com.      ;
ns1.gearboy.com.        86400   A       216.127.79.181  ;
ns2.gearboy.com.        86400   A       216.127.79.178  ;
pobox.gearboy.com.      86400   A       216.127.79.181  ;
wall.gearboy.com.       86400   A       216.127.79.178  ;


together as well as creating

pobox.purple-hand.org   86400   A   216.127.79.181
purple-hand.org.    86400   MX  10  pobox.purplehand.org.

in place of

purple-hand.org.        86400   MX      10      pobox.gearboy.com.      ;


neither is working correctly - help!

***Jay

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