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Pakistan YouTube Block Breaks the World
Journal written by Alien54 (180860) and posted by
CmdrTaco
on Mon Feb 25, 2008 08:50 AM
from the oops-they-did-it-again dept.
from the oops-they-did-it-again dept.
Allen54 noted a followup to yesterday's story about Pakistan's decision to block YouTube. He notes that "The telecom company that carries most of Pakistan's traffic, PCCW, has found it necessary to shut Pakistan off from the Internet while they filter out the malicious routes that a Pakistani ISP, PieNet, announced earlier today. Evidently PieNet took this step to enforce a decree from the Pakistani government that ISP's must block access to YouTube because it was a source of blasphemous content. YouTube has announced more granular routes so that at least in the US they supercede the routes announced by PieNet. The rest of the world is still struggling."
Related Stories
[+]
Politics: Pakistan Blocks YouTube 648 comments
Multiple readers have written to tell us of news that Pakistan has ordered its ISPs to block access to YouTube "for containing blasphemous web content/movies." This follows increasing unrest in Pakistan over a Danish newspaper's reprinting of cartoons which depict Islam in a less-than-favorable light. The cartoons also sparked controversy when they were first published a few years ago.
[+]
Your Rights Online: Network Solutions Suspends Site of Anti-Islam Film 874 comments
h4rm0ny notes the furor over an anti-Islamic movie due to be released on the Web in the next week. After Pakistan disrupted YouTube worldwide over an interview with right-wing Dutch MP and filmmaker Geert Wilders, Network Solutions, acting as host as well as registrar, has suspended Wilders's site promoting the 15-minute film "Fitna" (a Koranic term translated as "strife"). The site now displays a notice that it is under investigation for possible violations of NetSol's acceptable use policy. According to the article the company's guidelines include "a sweeping prohibition against 'objectionable material of any kind or nature.'" The article describes the site's content before NetSol pulled the plug as a single page with the film's title, an image of the Koran, and the words "Coming Soon." No one but Wilders has seen the film to date. The Dutch government has distanced itself from the film, fearing Muslim backlash. A million Muslims live in The Netherlands. Wilders's party, which controls 9 of 150 seats in the Dutch parliament, was elected on an anti-immigration platform.
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But how did they do it? (Score:5, Insightful)
Re:But how did they do it? (Score:5, Interesting)
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Re:But how did they do it? (Score:5, Insightful)
Maybe I give them too much credit... But it's possible.
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Re:But how did they do it? (Score:4, Funny)
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Re:But how did they do it? (Score:4, Informative)
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Re:But how did they do it? (Score:5, Interesting)
Youtube had a route for 208.65.152.0/22 (208.65.152.0 - 208.65.155.255), but Pakistan's main ISP in Hong Kong announced a route for 208.65.153.0/24 (208.65.153.0 - 208.65.153.255) to keep youtube off their net. What they didn't understand though is this really needs to be kept as a local routing policy so it only affected Pakistan, but it sorta snuck out and affected the entire network.
Routing is the soft underbelly of the net.
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Re:But how did they do it? (Score:5, Interesting)
Pakistan Telcom does have an ASN number. Just for kicks, try this:
Head over to this site [routeviews.org]. It visualizes the BGP routes between different AS's. Click 'Start BGPlay'. The prefix in which YouTube lives is 208.65.153.0/24. Set the start time for about 24 Feb 2008 10:00, and the end time for about 25 Feb 2008 03:00 (times are UTC). Start the simulation.
You'll see a bunch of ASNs. Two have red circles around them. You can get their name by clicking on the number. On the left is YouTube, and on the right is Pakistan Telcom. Click play and watch what happens.
For those too lazy to actually watch this: All the routes destined for YouTube head towards Pakistan Telcom instead. Then, midway through, you see PCCW get wise and shut down those routes, and everyone slowly starts finding the actual YouTube. It's pretty neat to watch.
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Re:But how did they do it? (Score:5, Interesting)
I imagine that this event will introduce a lot of people to how high level internet routing works. Yes, its that vulnerable folks. Scary, but fortunately these events don't happen often. I think back in late 90s was the time when someone in Pennsylvania introduced a global route for everything to go to 0.0.0.0, which brought everything down for a day.
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Re:But how did they do it? (Score:5, Insightful)
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Re:But how did they do it? (Score:5, Insightful)
Unless you want to create an international organization with its own territory (sort of like the UN headquarters) that controls global routing- it can't be subject to any national law because it's got its own extraterritoriality (although international lawyers would tell me it's not true extraterritoriality, blah blah blah).
But somebody has to control THAT organization, and unless its mandate is simply to maintain the internet routing in a transparent manner between national-level routing domains...
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But how did they do it? (Score:5, Informative)
which was found from Cydeweys [cydeweys.com] which is updating as the story progresses. Both of those sites seem to be running a bit slow, so hesitate before clicking.
Full text of Reneysys: Pakistan hijacks YouTube.
A few hours ago, Pakistan Telecom (AS 17557) began advertising a small part of YouTube's (AS 36561) assigned network. This story is almost as old as BGP. Old hands will recognize this as, fundamentally, the same problem as the http://merit.edu/mail.archives/nanog/1997-04/msg00380.html [slashdot.org]">infamous AS 7007 from 1997, a more recent ConEd mistake of early 2006 [renesys.com] and even TTNet's Christmas Eve gift 2005 [renesys.com].
Just before 18:48 UTC, Pakistan Telecom, in response to government order [renesys.com] to block access to YouTube (see news item [yahoo.com]) started advertising a route for 208.65.153.0/24 to its provider, PCCW (AS 3491). For those unfamiliar with BGP, this is a more specific route than the ones used by YouTube (208.65.152.0/22), and therefore most routers would choose to send traffic to Pakistan Telecom for this slice of YouTube's network.
I became interested in this immediately as I was concerned that I wouldn't be able to spend my evening watching imbecilic videos of cats doing foolish things (even for a cat). Then, I started to examine our mountains of BGP data and quickly noticed that the correct AS path ("Will the real YouTube please stand up?") was getting restored to most of our peers.
The data points identified below are culled from over 250 peering sessions with 170 unique ASNs. While it is hard to describe exactly how widely this hijacked prefix was seen, we estimate that it was seen by a bit more than two-thirds of the Internet.
This table shows the timing of the event and how quickly the route propagated (this is actually a fairly normal propagation pattern). The ASNs seeing the prefix were mostly transit ASNs below, so this means that these routes were distributed broadly across the Internet. Almost all of the default free zone (DFZ) carried the hijacked route at least briefly.
18:47:00uninterrupted videos of exploding jello [youtube.com]
18:47:45first evidence of hijacked route propagating in Asia, AS path 3491 17557
18:48:00several big trans-Pacific providers carrying hijacked route (9 ASNs)
18:48:30several DFZ providers now carrying the bad route (and 47 ASNs)
18:49:00most of the DFZ now carrying the bad route (and 93 ASNs)
18:49:30all providers who will carry the hijacked route have it (total 97 ASNs)
20:07:25YouTube, AS 36561 advertises the
20:07:30several DFZ providers stop carrying the erroneous route
20:08:00many downstream providers also drop the bad route
20:08:30and a total of 40 some-odd providers have stopped using the hijacked route
20:18:43and now, two more specific
20:19:3725 more providers prefer the
20:28:12peers of 36561 start seeing the routes that were advertised to transit at 20:07
20:50:59evidence of attempted prepending, AS path was 3491 17557 17557
20:59:39hijacked prefix is withdrawn by 3491,
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Re:But how did they do it? (Score:5, Funny)
Sweden!
Oh. Shit. Well, ya had to muck things up with that requirement, huh?
Wait, I know! The United States can take over Sweden! Then we'll have one country with no history of censorship and nuclear missiles! It's perfect!
Hmm, free software/movies and Swedish chicks for me..... warmer weather and cheap blue jeans for them. Sounds like a win win for everybody concerned... and if any of those Swedes complain we'll just censor them ;)
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Re:But how did they do it? (Score:4, Funny)
They may not have nukes, but they DO have the Swedish Bikini Team, which is a powerful force for good. For example, name one time when North Korea has invaded Sweden. Just one. I rest my case.
* * * * *
"Buying the right computer and getting it to work properly is no more complicated than building a nuclear reactor from wristwatch parts in a darkened room using only your teeth."
—Dave Barry
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Re:But how did they do it? (Score:5, Funny)
Yes.
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Re:But how did they do it? (Score:4, Informative)
If you're talking about reverend Åke Green he didn't just say "I think homosexuality is bad", he called homosexuality an "abnormal, a horrible cancerous tumor in the body of society". And he while he did stand trial he was not found guilty of any crime.
/Mikael
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Re:But how did they do it? (Score:5, Informative)
The BGP [wikipedia.org] article on Wikipedia is as good a place to start as any. Beyond that you can do some Google searches for it.
Basically BGP is the protocol used by routers to exchange route information with each other. A real oversimplification would involve three networks/routers, A, B and C. C receives it's network connectivity through A. C announces the networks it's responsible for to A, whom aggregates them before announcing them (and it's own networks) to B.
In theory, A shouldn't accept any routes from C for IP addresses not owned by C. Apparently that wasn't the case here though, or Pakistan's little stunt wouldn't have impacted anybody outside of Pakistan.
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Re:But how did they do it? (Score:5, Informative)
Because multi-homed networks may wish to have finer control over which links traffic comes in on then allowed for with simple static routes. Because my above example (A/B & C) was a drastic oversimplification and the actual internet involves tens of thousands (hundreds?) of different networks connected in different ways and trying to manage static routes for all of them would be virtually impossible.
Imagine if the process of connecting a new network to the internet involved having to update static routing tables in every core router on the internet and you'll start to understand why BGP exists. Hell, there are routing protocols meant for internal usage (OSPF [wikipedia.org]), because static routes become unmanageable if you have more then a few routers/netmasks to contend with.
Not strictly. The "honor system" should really be limited to the Tier 1 providers. Anybody else really should be filtering the routes that they will accept. There are already provisions in place to remove the "honor system" from consideration -- it seems that Pakistan's upstream provider choose not to use them.
This really isn't anything new. This kind of stuff has happened before. It's not even unique to the internet either -- the POTS network has a routing protocol used to setup calls/announce which switch is responsible for which number/range. One would suspect that SS7 can be abused by "bad" telcos as easily as BGP can be abused by "bad" ISPs.
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Arstechnica explains (Score:5, Informative)
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Re:But how did they do it? (Score:4, Funny)
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Re:But how did they do it? (Score:5, Funny)
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Re:But how did they do it? (Score:4, Insightful)
Rather more likely is that this has something to do with the recent elections in Pakistan. The Musharaf just lost the election he had hoped would allow him to complete his transition from dictatorship to elected President. Instead he lost control of the process with the assassination of Bhutto.
Independent TV is a much bigger threat to the regime than independent press. Blogs have rather less credibility than actual video of a demonstration.
I suspect that the ISP chose this method of blocking the traffic for precisely the reason that it would cause the maximum notice. Implement a local block in Pakistan and the Pakistanis complain. Implement the block in such a way that it affects the whole region and you have so many more people working to circumvent the censorship.
BGP security has been a big concern for me for some time. In fact it is such a concern that it is one of the issues I did not address in my book on Internet crime precisely because I did not want to give people ideas.
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CBG (Score:5, Insightful)
Re:CBG (Score:4, Funny)
Unless it's all a cunning plan by my Governemnt to make it seem like I can connect, but reality I'm behind Hadrian's Firewall and surfing the UK Intranet. Which, admittedly, knowing the UK Government is perfectly possible... All I know is living in the UK I'm in no position to criticize the Pakistanis, because their country is much freer than mine.
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Re:CBG (Score:5, Insightful)
Basically a Pakistani ISP decided to implement the block of Youtube by announcing a new route for the IP addresses owned by Youtube that presumably directed all of that traffic into /dev/null or elsewhere. By accident (one would presume -- there is no reason to do this on purpose) those routes were announced outside of Pakistan by said ISP, whose upstream provider then relayed them to the rest of the internet (sheer stupidity on their part -- their configuration should have prevented this). Said upstream provider then decided to cut Pakistan off until they are able to correct the problem.
Yeah, I can't help but remember how Gordon Brown seized power in a military coup and allowed a leading member of the opposition to be brutally assassinated by extremists. It's amazing how far the UK has fallen, isn't it?
C'mon! As an American I can certainly sympathize with your disillusionment over your own Government's policies but get some perspective. It's not yet that bad. Freedom in the United States or United Kingdom isn't dead until people stop fighting for it and become as apathetic as you sound when you make statements like that.
Your country gave us the Common Law, the Magna Carta and the foundations of Representative Democracy. You stood alone against Hitler for all those lonely months between the Fall of France and the involvement of the Soviet Union and United States. That stand likely saved Western Democracy from Communism or Fascism. Start fighting for your freedoms instead of whining online about how much better Pakistan is. I suspect that the people fighting and dying for Democracy right now within Pakistan would have zero sympathy for your point of view.
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Re:CBG (Score:5, Insightful)
After the French Armistice on 22 June 1940 the UK, alongside the Commonwealth (Canada, New Zealand, Australia and South Africa) was the sole remaining major power that was still fighting Nazi Germany. She did fight alongside the other nations that were invaded (Greece comes to mind) but those nations capitulated fairly quickly, leaving the UK to fight on alone.
The UK remained alone until the launch of Barbarossa exactly one year (22 June 1941) after the signing of the French Armistice. Even at that, it seemed likely (at the time) that Germany would beat the Soviet Union and Churchill wasn't sure the Allies would win until after Pearl Harbor brought the United States into the war.
So yes, I give the UK a lot of respect for standing alone against the Nazi War Machine during that period. It was arguably the finest moment in British history and likely saved the Western Democracies from becoming conquered slave-states to Nazi Germany or Communist Satellites of the Soviet Union.
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Re:CBG (Score:5, Interesting)
And you must have missed the part of history class where they taught that the Battle of Britain started in June 1940, nine months prior to the passage of Lend-Lease.
Seriously though even if Lend-Lease/other assistance (destroyers for bases [wikipedia.org] comes to mind) was the sole thing that keep the Brits going, how does that diminish the bravery that they showed in continuing to fight on alone? They could have easily sought an armistice and probably would have emerged better off for doing so (the Empire would have survived instead of being bankrupted). The free world owes them a debt of gratitude for carrying on that fight even when things looked pretty bleak.
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Re:CBG (Score:4, Insightful)
He's an elected Member of Parliament, and supported by a majority in the Commons, which makes him Prime Minister. He could be turfed out tomorrow if he loses a motion of confidence, and parlimentary elections MUST take place by 2011.
OK, the first past the post system can throw out some weird results, and Labour does happen to get the best of them. Sixteen years of Tory government hints that this isn't a huge issue however.That is an issue of whether the Labour party has broken a commitment - this can be judged by voters at the next election or by MPs any time.
That was horrendous I agree, and the investigation after it not a great deal better. That said, it did happen 1 day after an attempted suicide bombing of the tube, and 1 month after a successful one. If the police where ever going to overreact it was then.
And will later be featured on national news, and (even before that) receive a grovelling apology from the Home Secretary. The reason that one went away was because the apology was accepted - maybe it shouldn't been but as you said the chap was a lifelong Labour member, and he can make his own decisions.
Agree with you on the DNA thing, but you don't help your argument by starting off with a badly supported rant.
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Re:Common law (Score:5, Insightful)
*sigh*, I think you largely missed the point. Let me spell it out for you using the words of Thomas Jefferson:
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.
That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it
(emphasis mine)
That's such a blatant oversimplification that I hardly know where to respond. The spirit of our Declaration of Independence (and all those other documents I referenced earlier) is that the Government exists to secure our rights -- my right not to be murdered by you trumps your right to do whatever you want. The Government derives it's power from the consent of the Governed and not the other way around.
How soon we forget our own history.
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A more technical explanation/discussion is here (Score:5, Informative)
"malicious" routes (Score:5, Insightful)
I should also point out that while bureaucrats in Pakistan may be bone-headed for blocking content, companies like Microsoft, Yahoo, Cisco and so forth are the ones who built things like the "Great Firewall of China". Lots of Americans like the point their finger at governments like China, whereas they could actually have more of an effect in making companies in their own countries stop building this sort of stuff.
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Re:"malicious" routes (Score:4, Insightful)
Propagating the change to the rest of the world may have been accidental, but the purpose -- to block YouTube throughout Pakistan -- counts as malicious in my book.
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PieNet fights back (Score:5, Funny)
Re:PieNet fights back (Score:4, Funny)
Miles Dyson: I feel like I'm gonna throw up.
John: Too much pie? Do you need some Redi-chill?
T-1: Cool Whip, dickwad.
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Religious purification (Score:4, Insightful)
They might as well isolate the country, keeping them from experiencing the interwebs altogether, it'll be impossible to keep their youth from being corrupted.
A Better Technical Explanation (Score:5, Informative)
Works for me (Score:5, Funny)
"Works for me."
First article (Third link) is not bull (Score:5, Insightful)
Political, not religious reasons. (Score:5, Informative)
Why it broke, in techie (Score:5, Informative)
I'll check back for related questions to fill in any blanks later :)
Gutenberg (Score:5, Interesting)
But mullahs forbade printing for 200 years, while in Europe it exploded. Mostly it was silly: religious stuff, cartoons, sex, but it was also maps, mathematics, etc.
Internet is about the same as an invention of printing was then. And again they are making the same mistake, again due to a fear of mullahs to lose their power.
Like 500 years ago it will just slow the development of their civilization.
Re:Cue "Islam is evil post" (Score:5, Insightful)
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Re:Cue "Islam is evil post" (Score:5, Funny)
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Re:What a REAL oppressive theocracy looks like (Score:5, Insightful)
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Re:What a REAL oppressive theocracy looks like (Score:5, Insightful)
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Re:What a REAL oppressive theocracy looks like (Score:4, Interesting)
If not... are you saying that theocratic regimes may censor, but ultimately do less harm than we do?
I guess I'm confused.
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Re:What a REAL oppressive theocracy looks like (Score:5, Insightful)
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Re:What a REAL oppressive theocracy looks like (Score:5, Funny)
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Religion as a cover for Political Censorship (Score:4, Insightful)
So if an Islamic court has any authority to order the PTT to block YouTube because of "blasphemy", it's because YouTube is carrying political news about the situation in Pakistan that Musharraff doesn't want people in Pakistan watching. If Iran had tried that kind of thing, that really would be a theocratic problem, but that's not the issue here. If they implemented it in a way that blocks YouTube from the rest of the world, it's because of incompetence, not malice. (That kind of thing happens a lot, usually because somebody does a bad job of router configuration, but usually ISPs filter out incorrect advertisements; their upstream provider didn't do a good enough job here.)
So in some sense it is similar to Bush in the US - pandering to the religious right wingers as a way to get radical right-wing politics done.
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Re:How Does One ISP Poison Everything? (Score:4, Insightful)
That's exactly what it allows, if your upstream provider isn't smart enough to filter the routes that you are allowed to announce. In theory your upstream provider won't accept any routes for IP addresses you don't own. In practice that isn't always the case, apparently.
Because their upstream provider is apparently too stupid or lazy to filter the networks they can announce. Once you get to a certain point (peering links between Tier 1 providers for example) it may be easier to just trust the people you are peering with and accept everything -- but to accept all routes announced by a leaf link is just plain stupidity. I'm really kind of surprised that this happened.
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BBC said outage was only 2 hours. (Score:4, Informative)
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