Weird DNS issues for domains

[Matthew Crocker <matthew () crocker com>]

I'm hoping someone on the list can help confirm that I'm not going  
insane.

I have a customer with the domain  'mtrsd.k12.ma.us'  The domain  
should be handled by our DNS servers (dns-auth1.crocker.com & dns- 
auth2.crocker.com)

The customer has an A record for www.mtrsd.k12.ma.us pointing to  
their web server
The customer has subdomains for each school in the district which  
have www records pointing to their web server via CNAME

Everything looks like it is configured properly on my servers but the  
customer is reporting that certain parents (VerizonDSL, Comcast,  
DirectWAY) can connect to certain website and not others.   At this  
point I think the problem is with the DNS servers at their ISP.

Can someone confirm my sanity?   My zone of control starts at  
mtrsd.k12.ma.us  I do not have control over k12.ma.us

What do you all see for sanderson.mtrsd.k12.ma.us &  
www.sanderson.mtrsd.k12.ma.us.

; <<>> DiG 9.2.2 <<>> @204.97.12.2 mtrsd.k12.ma.us NS
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 522
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;mtrsd.k12.ma.us.               IN      NS

;; ANSWER SECTION:
mtrsd.k12.ma.us.        258796  IN      NS      dns-auth2.crocker.com.
mtrsd.k12.ma.us.        258796  IN      NS      dns-auth1.crocker.com.

;; Query time: 39 msec
;; SERVER: 204.97.12.2#53(204.97.12.2)
;; WHEN: Thu Sep 29 09:29:28 2005
;; MSG SIZE  rcvd: 92

; <<>> DiG 9.2.2 <<>> @204.97.12.2 sanderson.mtrsd.k12.ma.us NS
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15880
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;sanderson.mtrsd.k12.ma.us.     IN      NS

;; ANSWER SECTION:
sanderson.mtrsd.k12.ma.us. 259200 IN    NS      dns-auth2.crocker.com.
sanderson.mtrsd.k12.ma.us. 259200 IN    NS      dns-auth1.crocker.com.

;; Query time: 2 msec
;; SERVER: 204.97.12.2#53(204.97.12.2)
;; WHEN: Thu Sep 29 09:31:15 2005
;; MSG SIZE  rcvd: 102


; <<>> DiG 9.2.2 <<>> @204.97.12.2 www.sanderson.mtrsd.k12.ma.us A
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52155
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.sanderson.mtrsd.k12.ma.us. IN      A

;; ANSWER SECTION:
www.sanderson.mtrsd.k12.ma.us. 86400 IN CNAME   www.mtrsd.k12.ma.us.
www.mtrsd.k12.ma.us.    51      IN      A       159.250.29.161

;; Query time: 48 msec
;; SERVER: 204.97.12.2#53(204.97.12.2)
;; WHEN: Thu Sep 29 09:31:52 2005
;; MSG SIZE  rcvd: 81


--
Matthew S. Crocker
Vice President
Crocker Communications, Inc.
Internet Division
PO BOX 710
Greenfield, MA 01302-0710
http://www.crocker.com