round-robin on bind9.2.1

[Kevin Darcy]

One thing to be aware of, however, is the bad interaction in pre-9.3 
versions of BIND 9 between the so-called default "round-robin" behavior 
(actually, "cyclic" isn't really the same thing as "round-robin") and 
sortlists. See Change #1223.

- Kevin

Gregory Hicks wrote:

>>Subject: RE: round-robin on bind9.2.1
>>Date: Sun, 20 Feb 2005 11:20:37 -0800
>>From: "Boyack, Kurt" <Kurt.Boyack at pyxis.com>
>>To: "Steven Job" <list3 at wwwcrazy.com>, <bind-users at isc.org>
>>    
>>
>[...snip...]
>  
>
>>So rrset-order was re-implemnted in a later version of 9.x, but isn't 
>>round-robin still the default? The original question was how to do
>>round-robin, not how to turn it off.
>>    
>>
>
>How to implement?
>
>[...snip part of zone file...]
>machine.name	IN A 1.2.3.4
>		IN A 1.2.3.5
>		IN A 1.2.3.6
>[...snip rest of zone file...]
>
>For each query made to this nameserver, BIND will cyclicly return all IP 
>addresses but the FIRST one returned rotates.
>
>Ie:  First is returned 1.2.3.4, 1.2.3.5, 1.2.3.6...
>at the next query is returned 1.2.3.5, 1.2.3.6, 1.2.3.4
>At the next query if returned 1.2.3.6, 1.2.3.4, 1.2.3.5
>...
>
>And so it goes.  Depending on how busy your server is, you may see the
>first IP, the second IP, the third IP, the first IP, ...  But the FIRST
>IP returned is going to vary.  If you query fast enough, you will see
>the rotation.
>
>Try www.hp.com to see how it works.
>
>ghicks-vpn% nslookup www.hp.com
>Server:  cds238.Cadence.COM
>Address:  158.140.128.1
>
>Non-authoritative answer:
>Name:    www.hpgtm.speedera.net
>Addresses:  161.114.22.111, 161.114.22.105
>Aliases:  www.hp.com
>
>ghicks-vpn% !!
>nslookup www.hp.com
>Server:  cds238.Cadence.COM
>Address:  158.140.128.1
>
>Non-authoritative answer:
>Name:    www.hpgtm.speedera.net
>Addresses:  161.114.22.111, 161.114.22.105
>Aliases:  www.hp.com
>
>ghicks-vpn% !!
>nslookup www.hp.com
>Server:  cds238.Cadence.COM
>Address:  158.140.128.1
>
>Non-authoritative answer:
>Name:    www.hpgtm.speedera.net
>Addresses:  161.114.22.105, 161.114.22.111
>Aliases:  www.hp.com
>
>ghicks-vpn% !!
>nslookup www.hp.com
>Server:  cds238.Cadence.COM
>Address:  158.140.128.1
>
>Non-authoritative answer:
>Name:    www.hpgtm.speedera.net
>Addresses:  161.114.22.111, 161.114.22.105
>Aliases:  www.hp.com
>
>ghicks-vpn% !!
>nslookup www.hp.com
>Server:  cds238.Cadence.COM
>Address:  158.140.128.1
>
>Non-authoritative answer:
>Name:    www.hpgtm.speedera.net
>Addresses:  161.114.22.111, 161.114.22.105
>Aliases:  www.hp.com
>
>ghicks-vpn% !!
>nslookup www.hp.com
>Server:  cds238.Cadence.COM
>Address:  158.140.128.1
>
>Non-authoritative answer:
>Name:    www.hpgtm.speedera.net
>Addresses:  161.114.22.105, 161.114.22.111
>Aliases:  www.hp.com
>
>ghicks-vpn% !!
>nslookup www.hp.com
>Server:  cds238.Cadence.COM
>Address:  158.140.128.1
>
>Non-authoritative answer:
>Name:    www.hpgtm.speedera.net
>Addresses:  161.114.22.111, 161.114.22.105
>Aliases:  www.hp.com
>
>ghicks-vpn% 
>
>Hope this helps!
>
>Regards,
>Gregory Hicks
>
>
>
>  
>
>>    
>>
>
>---------------------------------------------------------------------
>Gregory Hicks                           | Principal Systems Engineer
>Cadence Design Systems                  | Direct:   408.576.3609
>555 River Oaks Pkwy M/S 6B1             | Fax:      408.894.3479
>San Jose, CA 95134                      | Internet: ghicks at cadence.com
>
>I am perfectly capable of learning from my mistakes.  I will surely
>learn a great deal today.
>
>"A democracy is a sheep and two wolves deciding on what to have for
>lunch.  Freedom is a well armed sheep contesting the results of the
>decision." - Benjamin Franklin
>
>"The best we can hope for concerning the people at large is that they
>be properly armed." --Alexander Hamilton
>
>
>
>
>
>  
>