5 ms·

I'm updating a list of confirmed outages as I see them here https://news.ycombinator.com/item?id=12759520 https://news.ycombinator.com/item?id=12759520 So far

I'm updating a list of confirmed outages as I see them here https://news.ycombinator.com/item?id=12759520 https://news.ycombinator.com/item?id=12759520 So far twitter, etsy, soundcloud, spotify, github, pagerduty...crazy that this can even happen

owenwil 10y ago
Yep! Intercom is down as well
olegkikin 10y ago
They all work fine for me.
- owenwil 10y ago
  Caching is a magical thing :)
  - dspillett 10y ago
    If anycast routing is in play, which is not unlikely with a DNS service like that, then it may also be that specific servers are being attacked so the outages don't affect users in all locations as some will be routed to infrastructure that is not affected.
- mcjiggerlog 10y ago
  Me too. I'm in Spain - definitely seems to be geographical.
colanderman 10y ago
I'm surprised; I would have thought such large sites would use more than one DNS provider? I mean: $ host -t NS twitter.com twitter.com name server ns4.p34.dynect.net. twitter.com name server ns3.p34.dynect.net. twitter.com name server ns2.p34.dynect.net. twitter.com name server ns1.p34.dynect.net. I would have expected at least one of those to be somewhere else. What is the reason they would not have a backup provider?
- corobo 10y ago
  I'd guess the reasoning is that DNS providers these days are all anycast-style DNS. A DDoS would usually just be a blip on a few servers around the world depending on where the attacks originate. I'm not saying it's a good reason but it's a reason.
  - colanderman 10y ago
    The other reason of course to use two different providers is to mitigate the automatic error propagation issue: https://twitter.com/devops_borat/status/41587168870797312 https://twitter.com/devops_borat/status/41587168870797312
- komali2 10y ago
  I know a lot about some things, but almost nothing about networking, so excuse me if this is a really dumb question but - would your physical location determine what hosts you returned from that query? Like if you were in Asia would you get different ones back?
  - snug 10y ago
    Yes because DNS typically uses ANYCAST networking. The DNS request routes to the nearest location.
    - deleted 10y ago
      [deleted]
  - rosstex 10y ago
    The network definitely can (and often does) do load balancing by offering different DNS results for different regions.
wongarsu 10y ago
All of these work for me from Germany, and querying their authorative nameservers works just fine (so definitely no caching effect). Anycast for the win!
- Symbiote 10y ago
  They don't work from Denmark, at 16:17 UTC.
- elwell 10y ago
  https://www.whatsmydns.net/#A/twitter.com https://www.whatsmydns.net/#A/twitter.com
lucaspiller 10y ago
Isn't a major feature of DNS that it can be cached? Why aren't records being returned by ISP/Google DNS/OpenDNS servers? Is their TTL set that low?

owenwil 10y ago

Yep! Intercom is down as well

olegkikin 10y ago

They all work fine for me.

owenwil 10y ago
Caching is a magical thing :)
- dspillett 10y ago
  If anycast routing is in play, which is not unlikely with a DNS service like that, then it may also be that specific servers are being attacked so the outages don't affect users in all locations as some will be routed to infrastructure that is not affected.
mcjiggerlog 10y ago
Me too. I'm in Spain - definitely seems to be geographical.

colanderman 10y ago

I'm surprised; I would have thought such large sites would use more than one DNS provider? I mean: $ host -t NS twitter.com twitter.com name server ns4.p34.dynect.net. twitter.com name server ns3.p34.dynect.net. twitter.com name server ns2.p34.dynect.net. twitter.com name server ns1.p34.dynect.net. I would have expected at least one of those to be somewhere else. What is the reason they would not have a backup provider?

corobo 10y ago
I'd guess the reasoning is that DNS providers these days are all anycast-style DNS. A DDoS would usually just be a blip on a few servers around the world depending on where the attacks originate. I'm not saying it's a good reason but it's a reason.
- colanderman 10y ago
  The other reason of course to use two different providers is to mitigate the automatic error propagation issue: https://twitter.com/devops_borat/status/41587168870797312 https://twitter.com/devops_borat/status/41587168870797312
komali2 10y ago
I know a lot about some things, but almost nothing about networking, so excuse me if this is a really dumb question but - would your physical location determine what hosts you returned from that query? Like if you were in Asia would you get different ones back?
- snug 10y ago
  Yes because DNS typically uses ANYCAST networking. The DNS request routes to the nearest location.
  - deleted 10y ago
    [deleted]
- rosstex 10y ago
  The network definitely can (and often does) do load balancing by offering different DNS results for different regions.

wongarsu 10y ago

All of these work for me from Germany, and querying their authorative nameservers works just fine (so definitely no caching effect). Anycast for the win!

Symbiote 10y ago
They don't work from Denmark, at 16:17 UTC.
elwell 10y ago
https://www.whatsmydns.net/#A/twitter.com https://www.whatsmydns.net/#A/twitter.com

lucaspiller 10y ago

Isn't a major feature of DNS that it can be cached? Why aren't records being returned by ISP/Google DNS/OpenDNS servers? Is their TTL set that low?