Cannot query the MX record for cn.ibm.com

[Chris Buxton]

It could be related to the fact that the initial response from the  
authoritative servers is truncated if edns0 is not used. MS DNS is  
able to handle edns0, but perhaps your firewall doesn't like it.

$ dig cn.ibm.com mx +norec @ns.austin.ibm.com +ignore
[...]
;; flags: qr aa tc; QUERY: 1, ANSWER: 15, AUTHORITY: 3, ADDITIONAL: 0
[...]
;; MSG SIZE  rcvd: 508

$ dig cn.ibm.com mx +norec @ns.austin.ibm.com +edns=0
[...]
;; flags: qr aa; QUERY: 1, ANSWER: 15, AUTHORITY: 4, ADDITIONAL: 17
[...]
;; MSG SIZE  rcvd: 799

Chris Buxton
Professional Services
Men & Mice

On Jun 4, 2008, at 12:27 AM, Mr_Huang wrote:

> dear guru,
> Why I cannot query the MX record for cn.ibm.com from my Windows DNS?
> I can query the MX for au.ibm.com from my Windows server.
> and I can query the MX for cn.ibm.com from another linux DNS.
> Is there any different in the DNS implementation for Windows and
> Linux?
> any ideas would be appreciated.
> thanks
> huang
>