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davidu

5,831 karma · joined October 11, 2007

I'm David Ulevitch. Founder and CEO of OpenDNS. GP at a16z.

I have a website at http://david.ulevitch.com/

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davidu··on Unsent text accepted as dead man's will by Australian court
I better clean up my drafts folder. I have lots of unsent messages that I wrote in impulsive moods, but had the wherewithal not to send. And in most cases, fortunately never sent.
davidu··on Sublime Text 3.0
Not easy for an editor to support. There are much better tools available to print code or reflow plaintext into a .ps or .pdf.

Enscript[1] is my (the?) preferred way and a plugin would be a fine tay to achieve this. Will format code in almost any way you could ever imagine.

1: https://www.gnu.org/software/enscript/

davidu··on Robocalls Flooding Your Cellphone? Here’s How to Stop Them
I use your product. It's great.
davidu··on I Fell Victim to a $1,500 Used Camera Lens Scam on Amazon
It seems like the Amazon reps weren't paying attention to the detail, or the seller was also supplying fraudulent evidence of delivery.

This blog post will likely get it resolved for the buyer, though it shouldn't have to be this way.

davidu··on BetterWorks and CEO sued by ex-employee for alleged sexually suggestive assault
The only thing worse than this accusation is the alleged coverup. Holy smokes.

Also, a certain irony is that it stands in contrast to the entire point of this company.

davidu··on Cisco acquires network security startup Observable Networks
Congrats to this terrific team. Excited to work with you!
davidu··on 6 Women Accuse Tech VC Justin Caldbeck of Sexual Assault and Harassment
I'll say one. I was on a phone call with Jonathan from Binary Capital when they were looking at an investment in a company I am investor in. They were pushing overly onerous terms, and were changing the original terms that had been agreed upon, including requiring the founders to revest 100% of their vested options/equity despite being multiple years into the company building journey.

The company was at a low point and Binary was trying to squeeze them. Now the company is flying, and Binary missed out. The entire experience made me feel compelled to caution to every entrepreneur who has approached me about working with them since, including another who did, and now regrets it for other reasons.

davidu··on 6 Women Accuse Tech VC Justin Caldbeck of Sexual Assault and Harassment
This is disgusting, pathetic, and predatory.

It also has a long-term chilling effect on women in technology and entrepreneurship.

I am surprised by the lack of outrage over this behavior.

davidu··on Amazon to Acquire Whole Foods for $13.7B
If this was the strategy, it would not require the complexity of an acquisition and a price tag of $13b.

-David

davidu··on Amex, Challenged by Chase, Is Losing the Snob War
This article focuses on the emotional attachment to a card, but that's not the driver. It just comes out that way. I spend a lot of time on FlyerTalk where the decline of Amex has been discussed over and over. There were mistakes made on the revenue side, and on the rewards side. Three events basically tilted the entire balance away from Amex:

1. Failed negotiation with CostCo and losing the CostCo credit business.

2. The United and Continental merger that signed the death of the United / Amex relationship as all of that credit business moved to Chase and United was removed as a redemption partner, which was the number one membership rewards partner by a long-shot.

3. The loss of JetBlue as a partner that demotivated Amex in the affluent NYC credit theatre.

There were many other mistakes made, but those three had a compounding effect on Amex's negotiating leverage to earn transactions, carry cards, and to offer valuable rewards that drive member sentiment.

That's it. Three moves, each on their own survivable, but in concert essentially destroyed a well-balanced equation.

The question is, how will they catapult out of this?

davidu··on DNSCrypt – A protocol to improve DNS security
I do, which is why I drove the creation of DNSCrypt.
davidu··on Introducing Netflix Stethoscope
Mojave was a great idea. I've tried and failed to recruit the founder and engineering leader for Mojave at least three times. :-)
davidu··on Dole Food Had Too Many Shares
This is why eShares or someone like them will disrupt this entire ecosystem.

ComputerShares should be killed off too.

The entire system is amazingly broken.

davidu··on Node-RED: A visual tool for wiring the Internet of Things
I saw this a while ago and thought it was neat but for me it was just a toy to try out. I couldn't understand two things:

  1) What's the use case?
  2) Who is the audience?
Does anyone know the answer to those two things?
davidu··on Service Canary – Detect and alert on changes within your infrastructure
This appear to be a hybrid IDS w/ some SIEM capability.
davidu··on Uber Now Tracks Passengers’ Locations Even After They’re Dropped Off
This is totally impractical.
davidu··on What’s the Second Job of a Startup CEO?
My three priorities when I was a CEO: Team, Vision, Cash.

Easier said than done.

davidu··on Transparent DNS proxies
Yep.
davidu··on Systemd and the crashing tweet
Having been an operator for nearly 20 years, is this a problem actual admins face? I've never experienced this. I always used runit or daemontools, but even with sysvinit I never had these issues.
davidu··on How HotelTonight Scaled Their Stack [audio]
This is a frustratingly misleading title. They haven't had an IPO yet and it's unclear if they ever will.

One article in Bloomberg about trying to turn the company around and prepare for an IPO isn't the same thing. There is undoubtedly an order of magnitude (or greater) between the companies who have actually gone through an IPO and the number who have claimed they (or the press has claimed) will.

davidu··on Dyn post mortem
This is not their post mortem. This is just an update now that the dust is starting to settle.

Nobody wants to be in their shoes, but hopefully they will release a detailed post mortem so we can see what steps we might take in the future to defend against such large Internet-scale attacks.

Ideally some PCAPs will be released...

davidu··on DDoS Attack Against Dyn Managed DNS
I'm not sure what metric you use to judge it as terrible.

I thought it was great. 10,000 companies pay for my service today. 65 million people use my infrastructure today. Cisco bought the company for more than $650m. It continues to innovate on the decades old DNS in secure and useful ways.

So let me know what part is terrible.

davidu··on DDoS Attack Against Dyn Managed DNS
It's been years since we did that, and they were not spam pages, and easily able to opt-out.
davidu··on DDoS Attack Against Dyn Managed DNS
OpenDNS does this: https://support.opendns.com/hc/en-us/articles/227987767-Dyna...

It's called SmartCache.

davidu··on The Hard Raise
13.91x return. It doesn't appear all capital was called, but assuming it was, on a $100m fund the return is is $1,391m.

Assuming 2/20 economics for the partners, that's $278.2m returned to the partners.

2% MGMT fees would be 2m/year over 10 years ($20m), but that probably had nuance (drawdown after $x years, or % of called capital) and/or had to be paid back, so let's ignore that.

Assuming Brad and Fred each split the carry 40% 40% (and 20% for other people) that's about $100m return to each of the two major partners.

Nice return for delivering a great LP shareholder return on a reasonable timeframe.

davidu··on [dead]
Pretty sure they don't give out your number. They use a MITM relay. When you call and text, it doesn't go direct, afaik.
davidu··on Dropbox Hasn't Learned Their Lesson
Don't you think it's possible that it is just a bug that "enable finder integration" being unchecked doesn't disable this by greying out "finder toolbar" and disabling it?
davidu··on DNS-over-HTTPS
I'll rephrase, it's way better accomplished with UDP without sacrificing security in the ways I list.

Running DNS over HTTPS over TCP isn't needed. It doesn't solve a problem.

Doing JSON DNS for OOB DNS checks is useful since most applications speak HTTP. :-)

davidu··on DNS-over-HTTPS
We did the same thing w/ JSON responses: https://www.openresolve.com/

This is a bad idea outside of experimentation. Not to be used for production.

If you want to secure DNS look at QUIC, TLS, or my favorite, DNSCrypt (which I funded).

davidu··on Show HN: dingo - a Google DNS-over-HTTPS caching proxy in Go
DNSCrypt (https://dnscrypt.org/) would be more elegant here (DTLS also okay) and is in-band wrapper for DNS. It's what TLS is for HTTP but for DNS and keeps things UDP.

Worth pointing out, this is not a google project, it just uses Google's DNS over HTTP endpoint.

We have one we made at https://www.openresolve.com/

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