OpenDNS again

More on OpenDNS

I wasn’t about to try diddling the router at 11:30 last night but it seemed like a no-brainer to test out this OpenDNS service.

So, look at the little button below. If it says “You’re using OpenDNS” then clearly someone in your network (your local PC, router, DNS, ISP, …) is using OpenDNS. The “code” for this button is simplicity itself

<a title="Use OpenDNS to make your Internet faster, safer, and smarter." href="">
     <img style="border:0;"
          alt="Use OpenDNS" width="155" height="52" />

So, if was sent to my ISP, it would likely resolve in one way and if it was sent to OpenDNS, it would resolve a different way. That means that the image retrieved would differ based on whether you are using OpenDNS or not.

Use OpenDNS

Step 1: Setup was trivial. I logged in to my router and deposited the DNS server addresses and hit “Apply”. The router did its usual thing and voila, I was using OpenDNS.

Step 2: Setup an account on OpenDNS. Easy, provide an email address and add a network. In this case, it correctly detected the public IP address of my router and populated its page. It said it would take 3 minutes to propagate within the OpenDNS network. There’s an email confirmation, you click on a link, you know the drill.

Step 3: Setup stats (default: disabled)

All easy, web page resolution seems to be working OK. Let me go and look at those stats they talk about. (Click on the picture below to see it at full size).

Stats don't seem to quite work!
Stats don't seem to quite work!

August 17th you say? Today is September 1st. I guess tracking 16 billion or so DNS queries for two days in a row is a little too much for their infrastructure. I can suggest a database or two that would not break a sweat with that kind of data inflow rate.

July 30, 2009: OpenDNS announces that for the first time ever, it successfully resolves more than 16 Billion DNS queries for 2 days in a row.


So far, so good. I’ve got to see what this new toy can do 🙂 Let’s see what other damage this thing can cause.

Content Filtering

Nice, they support content filtering as part of the setup. That could be useful. Right now, I reduce annoyances on my browsing experience with a suitably crafted “hosts” file (Windows Users: %SYSTEMROOT%system32driversetchosts).       localhost
[... and so on ...]

I guess I can push this “goodness” over to OpenDNS and reduce the pop-up crap that everyone will get at home. (click on image for a higher resolution version of the screen shot)

Content Filtering on OpenDNS
Content Filtering on OpenDNS

Multiple Networks!

Very cool! I can setup multiple networks as part of a single user profile. So, my phone and my home router could both end up being protected by my OpenDNS profile.

I wonder how that would work when I’m in a location that hands out a non-routable DHCP address; such as at a workplace. I guess the first person to register the public IP of the workplace will see traffic for everyone in the workplace with a per-PC OpenDNS setting that shares the same public IP address? Unclear, that may be awkward.

Enabling OpenDNS on a Per-PC basis.

In last nights post, I had questioned the rationale of enabling OpenDNS on a per-PC basis. I guess there is some value to this because OpenDNS provides me a way to influence the name resolution process. And, if I were to push content filtering onto OpenDNS, then I would like to get the same content filtering when I was not at home; e.g. at work, at Starbucks, …

I’m sure that over-anxious-parents-who-knew-a-thing-or-two-about-PC’s could load the “Dynamic IP” updater thing on a PC and change the DNS entries to point to OpenDNS before junior went away to college 🙂

So, I guess that per-PC OpenDNS settings may make some sense; it would be nice to have an easy way to enable this when required. I guess that is a fun project to work on one of these days when I’m at Starbucks.

Jeremiah says, “I do it on a per computer basis because I occasionally need to disable it. (Mac OS X makes this super quick with Locations)”. Jeremiah, please do tell why you occasionally need to disable it. Does something fail?

Other uses of OpenDNS

kuzux writes in response to my previous post that OpenDNS can be used to get around restrictive ISP’s. That is interesting because the ISP’s that have put these restrictions in place are likely only blocking name resolution and not connection and traffic. Further, the ISP’s could just as well find the IP addresses of the sites like OpenDNS and put a damper on the festivities. And, one does not have to look far to get the IP addresses of the OpenDNS servers 🙂

Two thoughts come to mind. First, if the authorities (in Turkey as Kuzux said) put the screws on OpenDNS, would they pour out the DNS lookup logs for specific IP addresses that they cared about (both source and destination). Second, a hypothetical country with huge manufacturing operations, a less stellar human rights record, and a huge number of take-out restaurants all over the US (that shall remain nameless), could take a dim view of a foreigner who had OpenDNS on his/her laptop and was able to access “blocked” content.

Other comments

Janitha Karunaratne writes in response to my previous post that, “Lot of times if it’s a locked down limited network, they will intercept all DNS traffic, so using OpenDNS won’t help (their own default DNS server will reply no matter which DNS server you try to reach)”. I guess I don’t understand how that could be. When a machine attempts a DNS lookup, it addresses the packet specifically to the DNS server that it is targeting. Are you suggesting that these “locked down limited networks” will intercept that packet, redirect it to the in-house DNS server and have it respond?

David Ulevitch (aka Founder and CTO of OpenDNS) writes, “Yeah, there are all kinds of reasons people use our service. Speed, safety, security, reliability… I do tests when I travel, and have even done it with GoGo on a VA flight and we consistently outperform”. Mr. Ulevitch, your product is wonderful and easy to use. Very cool. But, I wonder about this performance claim. When I am traveling, potentially sitting in an airport lounge, a hotel room, a coffee shop or in a train using GPRS based internet service with unknown bandwidth, is the DNS lookup a significant part of the response time to a page refresh, mail message download, (insert activity of your choice)?

My Point of View

It seems to work, it can’t hurt to use it at home (if my ISP has a problem with it, they can block traffic to the IP address). It doesn’t seem to be appreciably faster or slower than my ISP’s DNS. I’ll give it a shot for a while and see what the statistics say (when they get around to updating them).

OpenDNS is certainly an easy to use, non-disruptive service and is worth giving a shot. If you use the free version of OpenDNS (ie don’t create an account, just point to their name servers), there is little possible downside; if you get on a Virgin Atlantic flight, you may need to disable it. But, if you use the registered site, just remember that OpenDNS is collecting a treasure trove of information about where you go, what you do, and they have your email address, IP address (hence a pretty good idea of where you live). They already target advertising to you on the default landing page for bad lookups. I’m not suggesting that you will get spammed up the wazoo but just bear in mind that you have yet another place where a wealth of information about you is getting quietly stored away for later use.

But, it is a cool idea. Give it a shot.

OpenDNS and paid wireless services.

Why would anyone ever want to use OpenDNS? I just don’t get it? But, there must be a good reason that I’m totally missing.

I stumbled on this post, not sure how.

I didn’t know about OpenDNS but it seems like a strange idea; after all, why would someone not use the DNS server that came with their DHCP lease? Seems like a fairly simple idea, over-ride the DNS servers and force the choice to be to use the DNS servers that OpenDNS provides, but why would anyone care to do this on a PC by PC basis? That seems just totally illogical!

And the problem that the author of the blog (above) mentioned is fairly straightforward. PC comes on the Virgin Wireless network, attempts to go to a web page, sends out a connection request for a page (assume that it is from a cache of IP addresses) and receives a HTML redirect to a named page (asking one to cough up money). The HTML redirect mentions the page by name and that name is not cached and results in a DNS lookup which goes to OpenDNS. Those servers (hardcoded into the network configuration) are not accessible because the user has not yet coughed up said money. Conversely, If the initial lookup was not from a cached IP address then the DNS lookup (which would have been sent to OpenDNS) would have not made it very far (OpenDNS’s server is not reachable till you cough up money). One way or the other, the page asking the user to cough up cache would not have showed up.

So, could one really do this OpenDNS thing behind a pay-for-internet-service? Not unless you can add preferred DNS servers to network configuration without a reboot. (the reboot will get the cycle of DHCP request going again, and on the high volume WiFi access services, DHCP request will automatically expire the previous lease).

But, to the more basic issue, why ever would someone enable this on a PC-by-PC basis? I can totally understand a system administrator using this at an enterprise level; potentially using the OpenDNS server instead of the ones that the ISP provided. Sure beats me! And there sure can’t be enough money in showing advertisements on the redirect page for missing URL’s (or there must be a lot of people who fat-finger URL’s a lot more than I do).

And, the functionality of being able to watch my OpenDNS traffic on a dashboard, I just don’t get it. Definitely something to think more about … They sure seem to be a successful operation so there must clearly be some value to the service they offer, to someone.

When “free” isn’t quite “free”. Or, remember to read the fine print on online photo sharing sites.

A quick comparison of some online photo sharing sites.

I have been a happy user of Flickr (I use the “frugal” account) till yesterday when I got a big pop-up box about a 200 image limit. Apparently flickr does offer unlimited free image storage but the fine print says that only the most recent 200 can be shared. Not the worst thing in the world but I began to think of all the other things I did not like about Flickr and so I started to look around and see whether I had some other alternatives.

There are any number of online image sharing sites. Many of them are also linked with photo printing services, and arguably that is where the money is. It appears that the devil is most certainly hiding in the fine print. Here is a short summary of what I found. I’m planning to move to Shutterfly; do you have some experience with them which makes this a bad idea?

Free Account

Paid Accounts


Free account has unlimited (modest resolution) image
storage. No more than 200 can be shared at a time. There are upload limits on the number and size of pictures that you can upload.

Unlimited upload, storage and high resolution storage.

$24.95 per year


Free account has limited (modest resolution) images.

Periodic logins are required; failure to do so will deactivate

Unlimited capacity, FTP uploads (what a concept), no
advertising, personal URL’s

$24.95 per year


Free unlimited storage of pictures. Images stored at high resolution. But you cannot download at high resolution. Personalized web portal.

I don’t think they even offer a paid account option. My
kind of place!

Snapfish (HP)


Snapfish offers unlimited photo sharing and storage. Customers must be “active”. The bar for an active customer is that you just need to
make one purchase a year.

But read this
. You can store high resolution images but downloading high
resolution images is not free.


No paid account.

Picasa (Google)

1GB limit (seems odd for the company that claims that
storage is unlimited).

Other limits also apply.

No paid offering that I could find.


No ads! Now, isn’t this a great graphic to illustrate the  success in targeted advertising and reinforce their point?

Smug Mug No Ads!
Smug Mug "No Ads!"


No free offering. There is a 14 day free trial.

Standard: $39.95/year

Power: $59.95/year

Pro: $149.95/year


Free image hosting.

Free unlimited storage.

Free high resolution image downloads.

100% FREE

Too good to be true?


Free site for 60 days. After that, need an order to keep
content online.

MPIX is a professional print outfit; online sharing is not
their primary business.

WHCC (White House Custom Color)

WHCC is a professional print outfit. They don’t do photo
galleries and sharing stuff. Go here if you want serious prints.

Not offered.

Not offered.

I think I’m heading to shutterfly. On Sept 5th I found this Shutterfly article (answer id 181)

“Currently, we do not have full resolution downloading available. However, we do have an Archive DVD service that you can order which contains full resolution copies of your pictures. The images on an Archive DVD will not include any of the Shutterfly enhancements or rotations that have been applied to an image loaded to Shutterfly.”

What BS is this? I guess I’m going to stick with Flickr for a while longer.

Also read

Making life interesting

I generally don’t like chain letters and SPAM but once in a while I get a real masterpiece. Below is one that I received yesterday …

Working people frequently ask retired people what they do to make their days interesting. Well, for example, the other day the wife and I went into town and went into a shop. We were only in there for about 5 minutes.

When we came out, there was a cop writing out a parking ticket. We went up to him and I said, “Come on man, how about giving a senior citizen a break?”

He ignored us and continued writing the ticket. I called him a Dumb ass. He glared at me and started writing another ticket for having worn tires. So Mary called him a shit head. He finished the second ticket and put it on the windshield with the first.

Then he started writing a third ticket. This went on for about 20 minutes.

The more we abused him, the more tickets he wrote.

Just then our bus arrived and we got on it and went home.

We try to have a little fun each day now that we`re retired.

It`s important at our age.


I’ve lost my cookies!

Some days ago I read an article (a link is on the Breadcrumbs tab on the right of my blog about Super Cookies). I didn’t think to check my machine for these super cookies and did not pay close attention to the lines that said:

GNU-Linux: ~/.macromedia

Sure enough …

amrith@amrith-laptop:~$ find . -name *.sol 2>/dev/null | wc -l

Hmmm …

amrith@amrith-laptop:~$ rm `find . -name *.sol 2>/dev/null `
amrith@amrith-laptop:~$ find . -name *.sol 2>/dev/null | wc -l

Much better. And my flash player still works. Let’s go look at some video …

amrith@amrith-laptop:~$ find . -name *.sol 2>/dev/null

Time to fix this sucker …

amrith@amrith-laptop:~$ tail -n 1 .bashrc
rm -f `find ./.macromedia -name *.sol 2>/dev/null`

Boston Cloud Services meetup yesterday

summary of boston cloud services meetup yesterday.

Tsahy Shapsa of aprigo organized the second Boston Cloud Services meetup yesterday. There were two very informative presentations, the first by Riki Fine of EMC on the EMC Atmos project and the second by Craig Halliwell from TwinStrata.

What I learnt was that Atmos was EMC’s entry into the cloud arena. The initial product was a cloud storage offering with some additional functionality over other offerings like Amazon’s. Key product attributes appear to be scalability into the petabytes, policy and object metadata based management, multiple access methods (CIFS/NFS/REST/SOAP), and a common “unified namespace” for the entire managed storage. While the initial offering was for a cloud storage offering, there was a mention of a compute offering in the not too distant future.

In terms of delivery, EMC has setup its own data centers to host some of the Atmos clients. But, they have also partnered with other vendors (AT&T was mentioned) who would provide an cloud storage offerings that exposed the Atmos API. AT&T’s web page reads

AT&T Synaptic Cloud Storage uses the EMC Atmos™ backend to deliver an enterprise-grade global distribution system. The EMC Atmos™ Web Services API is a Web service that allows developers to enable a customized commodity storage system over the Internet, VPNs, or private MPLS connectivity.

I read this as a departure from the approach being taken by the other vendors. I don’t believe that other offerings (Amazon, Azure, …) provide a standardized API and allow others to offer cloud services compliant to that interface. In effect, I see this as an opportunity to create a marketplace for “plug compatible” cloud storage. Assume that a half dozen more vendors begin to offer Atmos based cloud storage, each offering a different location, SLA’s and price point, an end user has the option to pick and choose from that set. To the best of my knowledge, today the best one can do is pick a vendor and then decide where in that vendor’s infrastructure the data would reside.

Atmos also seems to offer some cool resiliency and replication functionality. An application can leverage a collection of Atmos storage providers. Based on policy, an object could be replicated (synchronously or asynchronously) to multiple locations on an Atmos cloud with the options of having some objects only within the firewall and others being replicated outside the firewall.

Enter TwinStrata who are an Atmos partner. They have a cool iSCSI interface to the Atmos cloud storage. With a couple of clicks of a mouse, they demonstrated the creation of a small Atmos based iSCSI block device. Going over to a windows server machine and rescanning disks they found the newly created volume. A couple of clicks later there was a newly minted “T:” that the application could use, just as it would a piece of local storage. TwinStrata provides some additional caching and ease of use features. We saw the “ease of use” part yesterday. The demo lasted a couple of minutes and no more than about a dozen mouse clicks. The version that was demo’ed was the iSCSI interface, there was talk of a file system based interface in the near future.

Right now, all of these offerings are expected to be for Tier-3 storage. Over time, there is a belief that T2 and T1 will also use this kind of infrastructure.

Very cool stuff! If you are in the Boston area and are interested in the Cloud paradigm, definitely check out the next event on Sept 23rd.

Pizza and refreshments were provided by Intuit. If you haven’t noticed, the folks from Intuit are doing a magnificent job fostering these kinds of events all over the Boston Area. I have attended several excellent events that they have sponsored. A great big “Thank You” to them!

Finally, a big “Thank You” to Tsahy and Aprigo for arranging this meetup and offering their premises for the meetings.