mic.com.tw MX Record issues

Wed Feb 27 21:32:42 UTC 2002

My name servers are having trouble getting the mx records for the mic.com.tw
domain.

If I 

Dig mic.com.tw mx 

Against our name server that handle all external DNS queries I get

$ /usr/sbin/dig mic.com.tw mx              

; <<>> DiG 8.3 <<>> mic.com.tw mx 

;; res options: init recurs defnam dnsrch

;; got answer:

;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 4

;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUERY SECTION:

;;      mic.com.tw, type = MX, class = IN

;; Total query time: 23 msec

;; FROM: rootdns1 to SERVER: default -- 192.19.192.98

;; WHEN: Wed Feb 27 16:09:41 2002

;; MSG SIZE  sent: 28  rcvd: 28

If I query their DNS servers I get

$ /usr/sbin/dig mic.com.tw mx @203.66.161.1 +norec

; <<>> DiG 8.3 <<>> mic.com.tw mx @203.66.161.1 +norec 

; (1 server found)

;; res options: init defnam dnsrch

;; got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58710

;; flags: qr ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 2

;; QUERY SECTION:

;;      mic.com.tw, type = MX, class = IN

;; ANSWER SECTION:

mic.com.tw.             1D IN MX        0 mr1.mic.com.tw.

mic.com.tw.             1D IN MX        10 mitac.mic.com.tw.

;; ADDITIONAL SECTION:

mr1.mic.com.tw.         1D IN A         203.66.161.8

mitac.mic.com.tw.       1D IN A         203.66.161.1

;; Total query time: 247 msec

;; FROM: rootdns1 to SERVER: 203.66.161.1

;; WHEN: Wed Feb 27 16:20:31 2002

;; MSG SIZE  sent: 28  rcvd: 102

Now the name server listed for mic.com.tw never set the aa flag, so they are
considered lame. 

Not all the time but some of the times if I go back to our DNS servers right
after doing a +norec against their DNS server,  our DNS server will then
return a answer

$ /usr/sbin/dig mic.com.tw mx

; <<>> DiG 8.3 <<>> mic.com.tw mx 

;; res options: init recurs defnam dnsrch

;; got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4

;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 3

;; QUERY SECTION:

;;      mic.com.tw, type = MX, class = IN

;; ANSWER SECTION:

mic.com.tw.             23h52m44s IN MX  0 mr1.mic.com.tw.

mic.com.tw.             23h52m44s IN MX  10 mitac.mic.com.tw.

;; AUTHORITY SECTION:

mic.com.tw.             8h57m42s IN NS  dns.mic.com.tw.

mic.com.tw.             8h57m42s IN NS  mitac.mic.com.tw.

;; ADDITIONAL SECTION:

mr1.mic.com.tw.         18h28m28s IN A  203.66.161.8

mitac.mic.com.tw.       7h46m54s IN A   203.66.161.1

dns.mic.com.tw.         8h57m43s IN A   203.66.161.4

;; Total query time: 35 msec

;; FROM: rootdns1 to SERVER: default -- 192.19.192.98

;; WHEN: Wed Feb 27 16:23:02 2002

;; MSG SIZE  sent: 28  rcvd: 150 

Everything works ok till our cache expires. Why? Looking for some ideas?

Consequently we have email that consistently queues in our mail queues.

If I setup a zone type forward for mic.com.tw., pointing to there listed DNS
server mail never queues and everything appears good.

-Bob