Sixty Symbols of blowing your mind

July 3rd, 2009 Leave your comment »

Okay, I’m a geek. And I sometimes like to read books on physics, quantum physics, etc. And I also like to discuss these things with similarly geeky friends. But there are many people out there for whom anything to do with physics, quantum physics or astronomy is a total mystery. Well, fret no more.

The University of Nottingham has launched www.sixtysymbols.com, a brilliant and interesting website with lots of videos (okay, 60 videos) explaining different symbols of physics and astronomy and the thinking behind it. It’s a fun browse and the films are quite entertaining and very educational. Go check it out. Then come back and discuss ;-)

Drawing a Song or “Pintando una Canción”

June 24th, 2009 Leave your comment »

This. is. just. beautiful.

Pintando una Canción (translated: “Drawing a Song”) is a mind blowing, gracious, fluid en well-executed semi-interactive Flash animation. Just amazing. Wow.

Providing DHCP to multiple VLANs from one server

June 17th, 2009 Leave your comment »

Suppose you have a network with multiple VLANs, each with its own subnet, and you want your DHCP server(s) to serve addresses and configuration to all subnets (or at least more than one of them). The problem normally is that broadcast traffic (such as DHCP requests from clients) cannot traverse broadcast domains, which is exactly what VLAN separation does: limit broadcast domains.

There’s basically three solutions: the first is to provide a single DHCP server with a network interface in each VLAN. This will work fine for a very limited number of VLANs, but is not very effective for larger numbers of VLANs and it’s also not very flexible. Every new VLAN requires an extra NIC, cabling, etc.

The second solution is to provide each VLAN with its own DHCP server. This is not very flexible either and eats lots of resources per VLAN and adds a lot of management complexity.

The third solution adds flexibility, ease of management and does not require a major investment in separate servers. What you do need however is a Layer3 switch in stead of a Layer2 model. The reason for this is that the switch has to be capable to route, or more accurately: re-route IP packets.

To enable a single DHCP server to serve multiple subnets, one per VLAN, you can configure your switch (both Cisco and HP Layer3 switches can do this, and probably most other brands as well) with an ‘IP helper’. An IP helper address tells the switch to forward certain types of broadcasts (like DHCP requests, TFTP requests and DNS requests) via unicast to the IP address(es) configured. An example:

Here the DHCP server is using address 10.0.1.5 in VLAN 1, on subnet 10.0.1.0 /24. The two clients are on separate VLANs 2 and 3 with subnets 10.0.2.0 /24 and 10.0.3.0 /24 respectively. In this case, we need the switch that receives the DHCP requests broadcast from the clients to forward the requests to the DHCP server. To do this, we add the IP address of the server to the different VLAN interfaces as the IP helper:

interface vlan 1
ip address 10.0.1.1 255.255.255.0

interface vlan 2
ip address 10.0.2.1 255.255.255.0
ip helper-address 10.0.1.5

interface vlan 3
ip address 10.0.3.1 255.255.255.0
ip helper-address 10.0.1.5

 

The switch will now forward the request broadcasts to the DHCP server. If the DHCP server has been configured with separate ranges for each subnet, the right answer will be sent back by it to the switch and then forwarded to the client.

Book tip: “Security in a Web 2.0+ World: A Standards-Based Approach” by Carlos Solari

June 15th, 2009 1 Comment »

I went to hear Carlos Solari speak here in The Netherlands last week, and his message makes a lot of sense: to create truly secure infrastructures, devices and services, all components must be built using the ‘SBD’ or Security By Design principles.

Solari and his team put forth the view that to create a fully secure chain of trust (because trust is as important as security, if not more) the IT industry needs a verifiable, certifiable standard method of testing the eight factors they propose to enable manufacturers and developers to create truly secure products.

Aside from the solid message, Solari is a great speaker with an impressive career: the armed forces, then the FBI, followed by a couple of years as CIO for the Executive Office of the President at the White House. Now with Alcatel-Lucent’s Bell Labs as VP of security solutions, Carlos Solari is spreading the word on security, trust and reliability as inherent parts of any solution.

The book is “Security in a Web 2.0+ World: A Standards-Based Approach” and I recommend it. Amazon link here.

Safari 4 really is that fast

June 10th, 2009 Leave your comment »

I took the ‘new’ Safari 4 out for a test spin today, and although I have absolutely no factual test data the page rendering was indeed as fast as promised. All in all Safari is a very clean and sleek browser and does handle all I can throw at it with ease (like big Flash content, old and new Java apps and even some huge Javascript stuff).

Having moved from IE to Mozilla some time ago I’m actually contemplating using Safari for my day-to-day browsing now. Me like.

Magnum P.I. vs. Han Solo mashup

June 9th, 2009 Leave your comment »

This made me giggle all day:

You need to a flashplayer enabled browser to view this YouTube video

Thanks to Geekologie.

Happy Birthday to me!

May 14th, 2009 Leave your comment »

No, this is *NOT* sad. I am just happy I made it to 35 ;-)

Had some cake. Had some hugs and kisses, and my main man Robert bought me a totally sweet Asus VW220T 22″ widescreen TFT monitor, and it R-O-C-K-S!

Amazing caricature sculptures

April 29th, 2009 Leave your comment »

For those of us who remember the Spitting Image comedy series from the 80’s and 90’s these will look somewhat familiar, but they’re really brilliant and funny enough on their own:

David O’Keefe Studios’ sculptures

seinfeld_sculpture

The rise and fall of Atari

April 28th, 2009 Leave your comment »

Play Value did a great insight piece into the amazing rise and subsequent crash of game icon Atari in the 70’s and 80’s:

You need to a flashplayer enabled browser to view this YouTube video

The digital D’OH! factor

April 16th, 2009 Leave your comment »

Do you ever feel that sometimes people are so incredibly stupid that they’re basically beyond help? Now expand that feeling to include companies, governments and organisations. Are these people really this dumb? A small recap of some of the news stories of the past couple of weeks:

Associated Press

Associated Press (AP), one of the world’s most trusted news sources (well, until now that is), is suing news aggregators and search engines for a share in the profits, even if those third-party sites play nice and link through to the original AP source stories on AP’s own site.
This not only shows them to be moneygrabbing vapid suits, but also that they’re quite capable of completely misjudging and alienating these third party sites. I wonder what happens when Google decides to filter out all AP stories completely, and how happy AP-dependent newspaper sites will be about that. Open mouth, insert foot, AP.

Mrs. Zappa

Gail Zappa, widow of the musical (and lyrical) genius Frank Zappa, is basically suing her ass off and trying to stop anyone from playing Frank Zappa’s music anywhere anytime without ponying up some cash to her. Yes, she is the copyright holder, but owning a copyright does not give you full control over the works. As long as anyone who wants to cover or play your music plays nice and ensures that all the licensing fees are paid up, they’re actually allowed to play your stuff. And in fact you should be supporting them, thus ensuring that everyone is reminded of what a genius Frank was and subsequently going out and buying his albums.

Goldman Sachs

Goldman Sachs, the Manhattan investment bank – which is struggling amidst a massive global recession, owes $10bn to the US government in bailout funds, and last fall was forced to become a bank holding company with Treasury oversight due to worries it would run out of cash – has hired Chadbourne & Parke to close down the anti-Goldman website goldmansachs666.com, citing:

“Your use of the mark Goldman Sachs violates several of Goldman Sachs’ intellectual property rights, constitutes an act of trademark infringement, unfair competition and implies a relationship and misrepresents commercial activity and/or an affiliation between you and Goldman Sachs which does not exist and additionally creates confusion in the marketplace.”

So, a blogger that clearly states that his website criticising Goldman Sachs is in no way affiliated at all with Goldman Sachs is bullied by said company because he’s allegedly “confusing” innocent consumers. Yah, sure. And now, because the blogger won’t back down (and has numerous court rulings on his side to boot), Goldman Sachs has shot itself in the foot as the story blows up right into the major press channels.

RIAA/MPAA

What can I say? Rarely ever has a bigger bully been seen on the block, using big-money backers, expensive lawyers and the morals of the lovechild of Idi Amin and Irma Grese to protect the number one mantra: “We fear change. Pay us. We will not adapt. Pay us.” Abusing copyright laws and government influence, running sh*tloads of lobbyists and strong-arming anyone who disagrees appear to be paying off for them…but let me stress that “appears”.
It is becoming clearer and clearer every day that the MPAA, RIAA and all their henchm-…ummm…associates are in fact like Godzilla, screaming loudest just before slipping into the abyss.

The central tenure of all these stories (and much, much more): the world is changing, and the copyright owners are unwilling to change with the rest of us, in stead clinging to old revenue streams and scare tactics (the cease-and-desist notice must me the most printed letter in the world right now). Imagine this: what if the MPAA had taken the lead in digital distribution, offering choice and pay-per-extra solutions (Trent Reznor, anyone?) from the real source (the record companies)? If they had, they would have been the biggest thing around right now.

…breathe…

Okay, I know I can start ranting at times, but it just frustrates me so when this crap happens, especially because it confirms all the bad stereotypes the world has about the gov/tech-industrial complex.
Chill out guys, get some good advice, take some risks, try some new things out and find your way in the digital world. You’ll do much better, really. Come on in, the water is lovely.