| Posted by wlsiew, 09-02-2010, 11:03 PM | | Hi All,
I see several reseller hosting providers have features like DNS clusters be it from cPanel or DirectAdmin. Some provide 2 nameservers and 4 nameservers. However, I haven't see any provider gives out 6 nameservers.
However, I would like to know how can I verify those DNS clusters is genuine from 1 physical/VPS server and not 2/4/6 nameservers having different IPs pointing to the same physical/VPS server.
Thank you.
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| Posted by trustedurl.com, 09-02-2010, 11:04 PM | | Do an IP whois/traceroute on the IPs, if the cluster is separated over various NOCs, then the results should be different.
Btw, there's no benefit in giving out 6 nameservers imho.
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| Posted by wlsiew, 09-02-2010, 11:53 PM | | trustedurl.com, what if it is different network going to the same DC or provider?
6 nameservers just a example only, LOL
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| Posted by trustedurl.com, 09-03-2010, 01:08 AM | | traceroute it?
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| Posted by PremiumHost, 09-03-2010, 01:59 AM | | Tracert from your PC would not go to different routes to reach one server in a data center.
You don't even need to do tracert, whois is sufficient to show where dns server is hosted.
Agree with trustedurl.com ... "there's no benefit in giving out 6 nameservers"
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| Posted by wlsiew, 09-03-2010, 04:48 AM | | Some how some providers does host two different subnet in the same server for nameservers like this below (IP address is example only): -
ns1.nameserver.cc --> 1.2.3.4
ns2.nameserver.cc --> 1.2.4.3
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| Posted by trustedurl.com, 09-04-2010, 03:11 PM | | That's not a problem at all... why not just ask the host you have in mind where the nameservers are and how they are setup?
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| Posted by WW_P, 09-04-2010, 03:21 PM | | Besides that, most non-generic TLDs dont support more than 4 anyway.
(But you can use more than 4 even then, Round robin is your friend )
We use at the moment 2 NS with each 2 IPs:
ns1.
HK, HK
London, UK
ns2.
Shenzhen, CN
Fremont, CA, US
Though, i build a private cluster at the moment which will be maybe used in future in the company:
ns1.
HK, HK
London, UK
ns2.
Cairo, EG
Shenzhen, CN
ns3.
Chengdu, CN
Bratislava, SK
ns4.
Vienna, AT
Tokio, JP
the NS of the ns*. Subdomains are based on BIND Geoip patch and give out nameserver IPs based on location (thus 2 IPs on 2 continents per subdomain) - its complicated to explain, but works good so far (and is pain in the a** to config)
Last edited by WW_P; 09-04-2010 at 03:25 PM.
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| Posted by 040Hosting, 09-04-2010, 03:26 PM | | For good dns clusters they should not only be on different subnets but also on other networks; so a basic way to check is looking at the AS number of the IP's if they are all owned by the same DC chances are they host it on the same server; or else on a secondary server in the same network. In both cases it would not really be what you want.
Its not a perfect way; but it would get you closer to the truth; but why not simply ask them, if you cant trust your provider you shouldnt be hosting with them in the first place.
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| Posted by wlsiew, 09-05-2010, 01:42 AM | | I tried asking them but they turn out to an simple answer. I don't want to reveal the answer here. So, no point choosing them if they can't provide me the good answer and they are using 4 NS.
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| Posted by PremiumHost, 09-05-2010, 10:10 PM | | Whois of 1.2.3.4 & 1.2.4.3 will show either same or different data center.
From there you can tell the level of dns cluster.
DNS cluster can be on multiple servers in one data center or multiple servers across different data centers.
There's no real big issue of dns on the same server hosting websites.
It's useless to have dns up when web server is down.
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| Posted by wlsiew, 09-07-2010, 05:33 AM | | Agree with you. However I experienced with an old hosting provider putting primary and secondary nameserver into web server. One BIND service down, the web service is down. I know I can surf the website using IP but not other visitors.
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| Posted by 040Hosting, 09-07-2010, 06:16 AM | | If you are so scared of this why not search for a provider which can prove it to you ? Or use the DNS services of a DNS provider like i.e. EasyDNS
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| Posted by suhailc, 09-07-2010, 06:31 PM | | Hi,
Doing a basic WHOIS on the IPs of the DNS servers will give you a good idea of where they are located.
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