Cname of Cname

[Steven Job]

CNAMES of CNAMES are not allowed.

-Steve

On Mon, 23 Dec 2002, Do, Ho cao (NIH/CIT) wrote:

> 
> Our DNS servers running BIND 9.2.1 version
> Recently, we have encountered a problem that our DNS servers could not
> resolve the name www.corel.com.
> Therefore, I need to use the console from ISP to investigate the problem:
> 
> Further investigation reveals that www.corel.com in NS (ns1.corel.ca. and
> ns2.corel.ca.)
> when querying ns1.corel.ca. we obtain:
> 
> beast~:$ dig @ns1.corel.ca www.corel.com
> 
> ; <<>> DiG 8.3 <<>> @ns1.corel.ca www.corel.com 
> ; (1 server found)
> ;; res options: init recurs defnam dnsrch
> ;; got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
> ;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 13
> ;; QUERY SECTION:
> ;;      www.corel.com, type = A, class = IN
> 
> ;; ANSWER SECTION:
> www.corel.com.          1H IN CNAME     www.corel.com.edgesuite.net.
> 
> ;; AUTHORITY SECTION:
> .                       4d1h16m35s IN NS  C.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  G.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  F.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  B.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  J.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  K.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  L.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  M.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  I.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  E.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  D.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  A.ROOT-SERVERS.net.
> .                       4d1h16m35s IN NS  H.ROOT-SERVERS.net.
> 
> ;; ADDITIONAL SECTION:
> C.ROOT-SERVERS.net.     5d1h16m35s IN A  192.33.4.12
> G.ROOT-SERVERS.net.     5d1h16m35s IN A  192.112.36.4
> F.ROOT-SERVERS.net.     5d1h16m35s IN A  192.5.5.241
> B.ROOT-SERVERS.net.     5d1h16m35s IN A  128.9.0.107
> J.ROOT-SERVERS.net.     5d1h16m35s IN A  192.58.128.30
> K.ROOT-SERVERS.net.     5d1h16m35s IN A  193.0.14.129
> L.ROOT-SERVERS.net.     5d1h16m35s IN A  198.32.64.12
> M.ROOT-SERVERS.net.     5d1h16m35s IN A  202.12.27.33
> I.ROOT-SERVERS.net.     5d1h16m35s IN A  192.36.148.17
> E.ROOT-SERVERS.net.     5d1h16m35s IN A  192.203.230.10
> D.ROOT-SERVERS.net.     5d1h16m35s IN A  128.8.10.90
> A.ROOT-SERVERS.net.     5d1h16m35s IN A  198.41.0.4
> H.ROOT-SERVERS.net.     5d1h16m35s IN A  128.63.2.53
> 
> ;; Total query time: 93 msec
> ;; FROM: beast.toad.net to SERVER: ns1.corel.ca  206.47.20.37
> ;; WHEN: Mon Dec 23 16:49:42 2002
> ;; MSG SIZE  sent: 31  rcvd: 488
> 
> beast~:$ nslookup www.corel.com.edgesuite.net.
> Server:  beast.toad.net
> Address:  162.33.144.100
> 
> Non-authoritative answer:
> Name:    a219.g.akamai.net
> Addresses:  162.33.165.6, 162.33.165.9
> Aliases:  www.corel.com.edgesuite.net
> 
> As far as my limited knowledge in DNS the CNAME of CNAME is not allow in
> DNS.  Please explain.  
> If it is prohibited, how can it got away with previous BIND version such as
> 8.3.REL?
> If it is allowed, why do we cannot query from BIND 9.2.1 version?
> 
> I really appreciate any answer, Thanks in Advance!
> 
> 
> Sincerely,
> 
> Ho Cao Do
> 
> (301)435-1970   Voice
> (301)480-6041   Fax
> doh at mail.nih.gov
> 
>