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Is OpenDNS good?


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#1 VaynardX

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Posted 27 October 2010 - 04:06 PM

As the topic implies, is it good?

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#2 cryptodan

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Posted 27 October 2010 - 04:07 PM

I prefer my ISP's DNS Servers over OpenDNS, as I found OpenDNS to be slow.

#3 Animal

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Posted 27 October 2010 - 06:10 PM

Depends on what you expect the service to do. The question as phrased is relative.

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#4 Romeo29

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Posted 27 October 2010 - 08:06 PM

I find OpenDNS to be safer, it blocks access to many kinds of sites which is desired when you have kids in family. If you are looking for speed, then Google DNS servers are fast :thumbsup:

#5 NpaMA

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Posted 27 October 2010 - 09:37 PM

My laptop has 4 different DNS providers listed.

First off its Google DNS, follow by: Open DNS, 4.2.2.X series, and lastly my ISP's DNS.

My ISP's DNS servers are pretty poor. They give routing errors and page load errors frequently. Google DNS, 4.2.2.X and Open DNS are basically the same except I get better pings to Google and 4.2.2.X then Open DNS.

Edited by NpaMA, 27 October 2010 - 09:55 PM.


#6 cryptodan

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Posted 28 October 2010 - 03:29 AM

My laptop has 4 different DNS providers listed.

First off its Google DNS, follow by: Open DNS, 4.2.2.X series, and lastly my ISP's DNS.

My ISP's DNS servers are pretty poor. They give routing errors and page load errors frequently. Google DNS, 4.2.2.X and Open DNS are basically the same except I get better pings to Google and 4.2.2.X then Open DNS.



Ping times have nothing to do with DNS since it uses ICMP type 8. The only thing that would impact ping times would be location and distance from said server. Do a tracert to get a better understanding of your network flow.

#7 NpaMA

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Posted 28 October 2010 - 04:02 AM


My laptop has 4 different DNS providers listed.

First off its Google DNS, follow by: Open DNS, 4.2.2.X series, and lastly my ISP's DNS.

My ISP's DNS servers are pretty poor. They give routing errors and page load errors frequently. Google DNS, 4.2.2.X and Open DNS are basically the same except I get better pings to Google and 4.2.2.X then Open DNS.



Ping times have nothing to do with DNS since it uses ICMP type 8. The only thing that would impact ping times would be location and distance from said server. Do a tracert to get a better understanding of your network flow.

Ping times to DNS server, not the site.

The time it takes to get the IP/routing from the DNS server (ex: 50ms vs 100ms) is added on to the time to route to the site.

They can also give different routes(hence my comment about my ISP's giving bad routing).

#8 Romeo29

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Posted 28 October 2010 - 07:29 AM

Fastness of a DNS server is not determined by ping times. But how fast it takes to reply with your DNS request. Then again the reply times differ for different domain names.

#9 NpaMA

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Posted 28 October 2010 - 08:32 AM

I don't see how you can say the "ping times" (time it takes to go from you to the server, back, etc.) does not have any connection to how "fast" you'll get the correct information. Although you have points with the reply times differ'ing, ping time is still added. If you can make the request in 50ms vs 100ms, the overall, from start to end(DNS request to page loaded) will be 50ms quicker. (Of course assuming same routing, server load, etc.)

#10 ThunderZ

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Posted 28 October 2010 - 11:17 AM

Replying to a simple ping is different then actually sending\resolving a query.

IMO. Pinging is a very basic "test" not a true life measure.
When you are talking ms`s, response times are very difficult to discern to the naked eye, user. That is of course unless you start getting into hundreds of ms`s or more, seconds.

#11 NpaMA

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Posted 28 October 2010 - 12:16 PM

Yes ping's are basic test, normally good for checking line(local, ISP, and full routing) links to the server.

I know what you guys are saying, and while I do agree. Think closer DNS server = quicker look ups. And less chance of a problem "down the road" causing a mess up(or slow resolving).

Ping is normally the best(and easiest) way to see how close something is.

#12 cryptodan

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Posted 28 October 2010 - 05:11 PM

DNS works on a Time to Live basis and not ping based. The estimated time for new DNS Changes is anywhere from 48 to 72 hours to propagate throughout the rest of the world via the Root DNS Servers. If there is a routing path issue it goes to the next hop and so on and so forth. If it cannot make it before to TTL Value then that change will not be propagated.

Every ISP has access to the Root DNS Servers, so if your ISP is having routing or slow page resolution issues then its time to change ISP's to a more reliable on. I run my own DNS Server, and it is highly reliable. When I make a change the change is usually out to the rest of the world within in a couple of hours. You can verify this by using whois on http://www.network-tools.com.

Also if DNS information cannot make it after the TTL Value, then it will try again later and keep trying.

Edited by cryptodan, 28 October 2010 - 05:12 PM.


#13 VaynardX

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Posted 28 October 2010 - 07:29 PM

Hmm, I've heard of google dns too, but in terms of speed(and possible security) which is better? Google dns or opendns? And lastly, what's the no. for google dns(what to input)?

#14 NpaMA

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Posted 28 October 2010 - 08:59 PM

DNS works on a Time to Live basis and not ping based. The estimated time for new DNS Changes is anywhere from 48 to 72 hours to propagate throughout the rest of the world via the Root DNS Servers.

Yes, I know that.

If there is a routing path issue it goes to the next hop and so on and so forth.

Yes. But if its routing you through Dallas, NYC, LA, Memphis, back to NYC, then to the server in Orlando then its pretty bad routing - which is something my ISP does alot. This was my comment about the DNS servers of my ISP sucking. They also return high-ping(200ms+) for sites such as Google, Facebook, and Youtube that aren't fixed to one IP(they give an IP that is thousands of miles away, it even routed me to London once).


Every ISP has access to the Root DNS Servers, so if your ISP is having routing or slow page resolution issues then its time to change ISP's to a more reliable on.

Its the only thing available...Trust me, 3mb/512kb gets pretty slow.

When I make a change the change is usually out to the rest of the world within in a couple of hours. You can verify this by using whois on http://www.network-tools.com.

I'm not completely new to DNS updating, and the propagation time. I know the average time, and that it depends on when it was last renewed, what the DNS servers are set to fetch it as, etc.

I agree with you on every point except one - that a closer DNS server(can normally be seen from PINGs) gives better response/lookup times then a server hundreds, if not thousands, of miles away.

Hmm, I've heard of google dns too, but in terms of speed(and possible security) which is better? Google dns or opendns? And lastly, what's the no. for google dns(what to input)?

Google DNS: 8.8.4.4 and 8.8.8.8

Just try them and see which works best for you. Sorry for hijacking your thread, too.

#15 cryptodan

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Posted 29 October 2010 - 01:02 AM

You do realize that Google has servers located in every major routing hot spot on the earth via content servers. So if you live 200 miles away from the nearest google device and the second one is located 250 miles away of course you will get the 200 mile google device. If you want a true representation of where you site compared to the rest of the world network wise do a tracert to google and see how many hops it takes you to get there.

I will do one for an example:

C:\Users\cryptodan>tracert google.com

Tracing route to google.com [72.14.204.99]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms 192.168.1.1
2 7 ms 6 ms 7 ms L300.WASHDC-VFTTP-111.verizon-gni.net [173.73.4.1]
3 7 ms 7 ms 7 ms G5-0-2-1711.WASHDC-LCR-07.verizon-gni.net [130.81.137.186]
4 8 ms 7 ms 6 ms so-3-0-0-0.LCC1-RES-BB-RTR1-RE1.verizon-gni.net [130.81.29.0]
5 11 ms 9 ms 9 ms 0.so-3-2-0.XT1.DCA6.ALTER.NET [152.63.39.169]
6 8 ms 9 ms 9 ms 0.xe-0-0-0.XL3.IAD8.ALTER.NET [152.63.32.214]
7 12 ms 11 ms 12 ms TenGigE0-6-4-0.GW7.IAD8.ALTER.NET [152.63.37.82]

8 9 ms 9 ms 9 ms google-gw.customer.alter.net [152.179.50.106]
9 12 ms 11 ms 12 ms 216.239.46.248
10 19 ms 11 ms 24 ms 66.249.94.46
11 11 ms 11 ms 12 ms iad04s01-in-f99.1e100.net [72.14.204.99]

Trace complete.


The below is from http://www.network-tools.com

74.125.227.18 is from United States(US) in region North America


TraceRoute to 74.125.227.18 [google.com]
Hop (ms) (ms) (ms) IP Address Host name
1 20 19 13 72.249.0.65 -
2 25 13 10 64.129.174.181 64-129-174-181.static.twtelecom.net
3 17 9 16 66.192.240.90 dal2-pr1-ge-4-0-0-0.us.twtelecom.net
4 11 6 7 72.14.233.65 -
5 36 21 17 216.239.47.54 -
6 8 8 16 74.125.227.18 -

Trace complete


C:\Users\cryptodan>nslookup google.com
Server: nsrest01.verizon.net
Address: 71.252.0.12

Non-authoritative answer:
Name: google.com
Addresses: 72.14.204.104
72.14.204.147
72.14.204.103
72.14.204.99


The above are probably servers located in the New York and Washington DC Metro Area.




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