round-robin on bind9.2.1
Kevin Darcy
kcd at daimlerchrysler.com
Mon Feb 21 22:49:17 UTC 2005
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
>
>
>
>
>
>
>
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