Note that the name "218.246.85.101" -- which is the target of the
"www.01cool.com" alias -- does not exist in the Internet DNS.
I don't what kind of DNS implementation/configuration is running on
211.99.204.77, but it seems to be returning SERVFAIL for *any* recursive
query outside of its authoritative zones:
dig cnn.com @211.99.204.77
; <<>> DiG 9.3.0 <<>> cnn.com @211.99.204.77
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 800
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;cnn.com. IN A
which would, of course, include the aforementioned name "218.246.85.101".
For non-recursive queries outside of its authoritative zones, it gives a
root referral, which is reasonable.
I guess that crippling one's nameserver in this way is marginally better
than being an open recursor, but not by much...
- Kevin
On 6/25/2010 7:02 AM, ShanyiWan wrote:
Forwarding DNS Server can not resolved alias records(CNAME)?
here:
211.99.204.77 Forwarding DNS
Master Zone (another ip address)
[r...@flyinweb data]# vi 01cool.com.dom
$TTL 7200 ; 2 hours
@ IN SOA ns1.mymaster.com. root.mymaster.com. (
5; serial
10800; refresh
3600; retry
604800; expire
86400; mininum
)
NS ns1.mymaster.com.
NS ns2.mymaster.com.
MX 10 mail.01cool.com.
@ A 218.246.85.101
mail A 218.246.85.199
www CNAME 218.246.85.101.
www1 CNAME 517sou.net.
A Record is correct,but CNAME Record is incorrect!
[r...@flyinweb data]# dig @211.99.204.77 01cool.com
;<<>> DiG 9.7.0-P2<<>> @211.99.204.77 01cool.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17293
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
;; QUESTION SECTION:
;01cool.com. IN A
;; ANSWER SECTION:
01cool.com. 7200 IN A 218.246.85.101
;; AUTHORITY SECTION:
01cool.com. 7200 IN NS ns1.cnolnic.com.
01cool.com. 7200 IN NS ns2.cnolnic.com.
;; ADDITIONAL SECTION:
ns2.cnolnic.com. 6523 IN A 59.151.23.112
;; Query time: 108 msec
;; SERVER: 211.99.204.77#53(211.99.204.77)
;; WHEN: Fri Jun 25 19:00:35 2010
;; MSG SIZE rcvd: 104
[r...@flyinweb ~]# dig @211.99.204.77 www.01cool.com
;<<>> DiG 9.7.0-P2<<>> @211.99.204.77 www.01cool.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 25575
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.01cool.com. IN A
;; Query time: 108 msec
;; SERVER: 211.99.204.77#53(211.99.204.77)
;; WHEN: Fri Jun 25 18:57:27 2010
;; MSG SIZE rcvd: 32
~
--------------
ShanyiWan
2010-06-25
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