What is OpenDNS? - Comments Page 1

Bob, thank you for this article. I have never heard of OpenDNS and what it does. I am 'trial-testing' it right now, to see if, it really does access the Internet faster. I really like that it is FREE and you have 'control' over your settings. I have learned to 'listen' to you, over the years and have usually been quite pleased with your suggestions or insights. I am a BIG fan of Hulu, due to your article about what it is and does.

I like the typo correction feature. Sometimes I transpose letters in a URL and OpenDNS has caught every one.

My only "complaint" is a couple of times the OpenDNS servers were down. Even though I had the radio button checked for "Obtain an IP address automatically" (in TCP/IP Properties dialog box), I wasn't able to access the internet until I removed the OpenDNS Preferred and Alternate DNS Server addresses.

I thought by having the radio button checked for "Obtain an IP address automatically" that if the OpenDNS address(es) were not available for whatever reason, it would default back to my own ISP's address. Apparently, that's not the case.

EDITOR'S NOTE: No, you are correct. Your IP address will always be assigned by your ISP. But you CAN use OpenDNS as the primary DNS server, and your ISP's DNS server as secondary. (Ask your ISP what address to use for the DNS server.)

Follow-up to above: According to "ipconfig /all" my ISP IP address is xxx.xxx.24.37. It also shows a default gateway as xxx.xxx.24.38.

For clarification, are you saying I should use the OpenDNS IP address 208.67.222.222 as the Preferred DNS server and my ISP's address as the Alternate DNS server? If yes, do I use the xxx .37 or .38 (default gateway)?

EDITOR'S NOTE: No, you don't want to use your IP address or the gateway address as a DNS server value. Since it can be tricky to determine the ISP's DNS server, I'm changing my advice to "Ask your ISP what address to use for the DNS server".

Buf if you're geeky, read on... The trickiness arises from the fact that IPCONFIG /ALL will not report the correct DNS server numbers if you're connected to a router which implements Network Address Translation (NAT), and most routers do. You CAN login to your router, poke around a bit, and find the DNS server addresses on your own. But there are so many different types of routers, that I have to leave it as an exercise to the reader to navigate that path. :-)

Last follow-up, I promise. No router, just a modem. I remembered when I first set up the modem I had to access a special IP address to input my user information. I returned to that IP address today and it included system information such as:

DNS Servers xxx.xx.156.1 dnsr1.sbcglobal.net
xxx.xx.157.1 dnsr2.sbcglobal.net

Now my question is should I use OpenDNS 208.67.222.222 as the Preferred DNS server and ...156.1 as the Alternate DNS server? Thanks so much for your time and putting up with this not-so-computer-literate person.

EDITOR'S NOTE: Yes! You got it right.

sorry a novice here, we have three laptops, three gameing devices, playstation gameboy etc, and a couple of iphones all attatched to our wireless home network. sometimes they trip up getting a connection will they work better, or need setting up individually, if i use open DNS. thanks, jim lennon.

EDITOR'S NOTE: I don't think OpenDNS will help with your wireless connections. If you do try it, you won't need to do anything differently with your various wireless devices.

This sounds like a very interesting service. I have a couple concerns. As this becomes more and more popular, will they be able to handle the demand? My ISP had a major outage a couple months ago when their DNS servers crashed. To the typical web user, it was a full out outage. OpenDNS will suffer the same from time to time. Using my ISP as secondary could reduce the impact if the router is smart enough to reroute.
Phishing filters are becoming common on most teir one ISP systems but they are an added advantage always.
My concern lays in will OpenDNS be able to keep up with demand? A smart ISP keeps their DNS servers very "close" to their users and upgrades / adds as demand grows. How long before OpenDNS becomes over utilized? Can they grow enough to not become a bottle neck?
Cable modem service was great in the beginning until it became so popular that it slowed to a crawl. Thankfully, most cable operators solved that with added capacity but they were making money. How will OpenDNS afford the servers and internet connections to grow?
I will try this service and see how we make out.

EDITOR'S NOTE: OpenDNS has been around for several years, and is processing billions of connections per day. They seem to have things under control. :-)

I am a novice and I had nothing but problems. Here is a summary not to ask for help but to make others aware there could be problems and it will be more than just a 2 minute setup. OpenDNS would not let me set up a network in the dashboard setting. When I clicked the IP# I kept getting message: "network is a subset of another members CLOSED network". Therefore I wasn't able to set anything else up on the dashboard because I would then get a message that I needed to add a network (catch22). I now had OpenDNS on my pc without a network so I could not adjust any settings on the dashboard & a lot of my websites were being blocked (ie Utube)evidently because controls were set high which I couldn't get to! I emailed for help from DNS & their response was you must petition your ISP to allow you to add a "child" network for your IP. Boy that cleared it up for me. I had to reset the DNS 1 & 2 on my router & go back to default so I could go to my websites.

Hi Bob -
I'm one of your satisfied readers in Uk. My comment relates to that on the OpenDNS topic.
So my query to Google would go out to my router, across our natiomnal carrier BT's DSL circuit, into BT's core, over to the ISP's central pipe, into the ISP's core, past the VLAN containing their DNS servers, out their POP onto their 'fat pipe' to the internet and across to the data centre presumably in the USA where OpenDNS has their nameservers, where a front end srever checks your request against your user config before passing the actual request to the actual DNS...and then the info travels back again. The benefits to us outside the USA seem mainly in in configuriong blocking policies as far as we can see.
Web address shortforms? The last 3 iterations of browsers already recollect your browsing history to the extent of auto-completing the address you are typing. No, not for us.

Hi Bob - everyone knows that nothing is free, and OpenDNS would need to run a pretty big, expensive data centre. I visited the OpenDNS website to try to get some insight into their value proposition - nothing obvious there....so, how do they make money?

EDITOR'S NOTE: They make money from the advertising on the page that appears when you type an invalid URL. Who'da think it? Big money in typos.

Hi - couple of things, one in repsonse to James Barretts' comment that using a DNS lookup service in the US would slow things down. I live in the UK and have used OpenDNS for over a year now, and I have never noticed any significant delay. This is because they have a "globally distributed network".

My only prob has been when using it in our church. We use a wirelss router to provide access to the internet, and use OpenDNS to provide content control. However since we have a dynamic IP address and OpenDNS uses the IP address to set the level of content control, every time the IP address changes we have to manually let OpenDNS know (we don't run with a PC permanently connected, just the modem/router). Good news is that, according to a recent newsletter from them, OpenDNS is linking with Netgear who will provide routers with OpenDNS configured to cope with dynamic IP addresses so that should take care of this issue. I don't have the problem at home as my PC runs an IP monitor which updates OpenDNS whenever my ISP assigns me a new IP address.