NS Round Robin?
Rich Phillips
Richard_Phillips at lucent.com
Mon Nov 15 17:22:26 UTC 1999
Folks,
A question has come up, that I am sure that I read somewhere, but I looked
in 2 of the 3 DNS & BIND versions, and can't find it anywhere.
In the whois response below. There are 4 nameservers listed. They are
"listed in order" according to the whois response? The thought was these
nameservers actually will respond in a round robin scenario. But it doesn't
appear that the actual whois response flip flops the servers, like a regular
query.
My thoughts are that the whois response is giving simply a database
response. It even looks as if they are in alpha/numeric order?? When a
domain is queried, it goes to the appropriate root, resolves the appropriate
domain, and which ever NS record is on the top, then that is the one that is
given to the resolver.
The specific concern is that if the Primary is not listed first(in the whois
query), then it could mess up queries that would be sent for a particular
nameserver. I don't think that this is correct, and need additional
information to verify my position.
If anyone can verify (preferably with an RFC, email, or such), then that
would be greatly appreciated!!
Rich
----------------------------------------------------------------------------
--
Registrant:
Microsoft Corporation (MICROSOFT-DOM)
1 microsoft way
redmond, WA 98052
US
Domain Name: MICROSOFT.COM
Administrative Contact:
Micosoft Hostmaster (MH37-ORG) msnhst at MICROSOFT.COM
425 882 8080
Fax- - .: 206 703 2641
Technical Contact, Zone Contact:
MSN NOC (MN5-ORG) msnnoc at MICROSOFT.COM
425 882 8080
Fax- PATH
Billing Contact:
Microsoft-Internic Billing Issues (MDB-ORG)
msnbill at MICROSOFT.COM
425 882 8080
Fax- ïvxt
Record last updated on 11-Dec-1998.
Record created on 02-May-1991.
Database last updated on 15-Nov-1999 12:26:31 EST.
Domain servers in listed order:
ATBD.MICROSOFT.COM 131.107.1.7
DNS1.MICROSOFT.COM 131.107.1.240
DNS4.CP.MSFT.NET 207.46.138.11
DNS5.CP.MSFT.NET 207.46.138.12
> set type=ns
> microsoft.com
Server: MasterDNS.saturn.bbn.com
Address: 204.166.61.245
Non-authoritative answer:
microsoft.com nameserver = DNS4.CP.MSFT.NET
microsoft.com nameserver = DNS5.CP.MSFT.NET
microsoft.com nameserver = DNS1.microsoft.com
microsoft.com nameserver = ATBD.microsoft.com
DNS4.CP.MSFT.NET internet address = 207.46.138.11
DNS5.CP.MSFT.NET internet address = 207.46.138.12
DNS1.microsoft.com internet address = 131.107.1.240
ATBD.microsoft.com internet address = 131.107.1.7
> microsoft.com
Server: MasterDNS.saturn.bbn.com
Address: 204.166.61.245
Non-authoritative answer:
microsoft.com nameserver = DNS5.CP.MSFT.NET
microsoft.com nameserver = DNS1.microsoft.com
microsoft.com nameserver = ATBD.microsoft.com
microsoft.com nameserver = DNS4.CP.MSFT.NET
DNS5.CP.MSFT.NET internet address = 207.46.138.12
DNS1.microsoft.com internet address = 131.107.1.240
ATBD.microsoft.com internet address = 131.107.1.7
DNS4.CP.MSFT.NET internet address = 207.46.138.11
> microsoft.com
Server: MasterDNS.saturn.bbn.com
Address: 204.166.61.245
Non-authoritative answer:
microsoft.com nameserver = DNS1.microsoft.com
microsoft.com nameserver = ATBD.microsoft.com
microsoft.com nameserver = DNS4.CP.MSFT.NET
microsoft.com nameserver = DNS5.CP.MSFT.NET
DNS1.microsoft.com internet address = 131.107.1.240
ATBD.microsoft.com internet address = 131.107.1.7
DNS4.CP.MSFT.NET internet address = 207.46.138.11
DNS5.CP.MSFT.NET internet address = 207.46.138.12
> microsoft.com
Server: MasterDNS.saturn.bbn.com
Address: 204.166.61.245
Non-authoritative answer:
microsoft.com nameserver = ATBD.microsoft.com
microsoft.com nameserver = DNS4.CP.MSFT.NET
microsoft.com nameserver = DNS5.CP.MSFT.NET
microsoft.com nameserver = DNS1.microsoft.com
ATBD.microsoft.com internet address = 131.107.1.7
DNS4.CP.MSFT.NET internet address = 207.46.138.11
DNS5.CP.MSFT.NET internet address = 207.46.138.12
DNS1.microsoft.com internet address = 131.107.1.240
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