ruby - 无法解析 ruby​​gems.org(重定向太多)

Question

出于某种原因，我的 vagrant VM 无法解析 rubygems.org。昨天工作正常，今天我没有做任何更改，现在它不再工作了:

全新 Ubuntu 安装

vagrant -v # 1.5.3
vagrant init hashicorp/precise64 # ubuntu
vagrant up
vagrant ssh

安装 ruby gem (失败)

sudo apt-get update
sudo apt-get install rubygems -y

# here comes the failure...
sudo gem install librarian-puppet

"ERROR:  Could not find a valid gem 'librarian-puppet' (>= 0) in any repository
ERROR:  While executing gem ... (Gem::RemoteFetcher::FetchError)
too many redirects (http://www1.dlinksearch.com/?..."

无法解析 ruby​​gems.org

wget rubygems.org 

"Resolving rubygems.org (rubygems.org)... ::ffff:67.215.65.145, 54.245.255.174
Connecting to rubygems.org (rubygems.org)|::ffff:67.215.65.145|:80... connected.
HTTP request sent, awaiting response... 303 See Other
Location: http://www1.dlinksearch.com/?url=rubygems%2Eorg [following]
--2014-04-23 02:28:15--  http://www1.dlinksearch.com/?url=rubygems%2Eorg
Resolving www1.dlinksearch.com (www1.dlinksearch.com)... ::ffff:67.215.65.145, 
20 redirections exceeded."

其他网站似乎没问题

wget google.com
Resolving google.com (google.com)... 173.194.126.8, 173.194.126.14, 173.194.126.2, ...
HTTP request sent, awaiting response... 200 OK
2014-04-23 02:36:57 (651 KB/s) - `index.html.2' saved [13872]

我可以通过IP地址解析

wget 54.245.255.174 
--2014-04-23 02:44:59--  http://rubygems.org/
Resolving rubygems.org (rubygems.org)... ::ffff:67.215.65.145, 54.245.255.174
HTTP request sent, awaiting response... 200 OK

更多信息

gem env 
  - RUBYGEMS VERSION: 1.8.15
  - RUBY VERSION: 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]
  ...
  - REMOTE SOURCES:
    - http://rubygems.org/

它正在工作

• 昨天晚上一切正常!
• VM/etc/hosts 似乎没问题
• 我可以从我的桌面浏览器访问 ruby​​gems.org，没有任何问题
• 已经尝试过销毁并创建一个新的虚拟机
• 尝试重新启动我的电脑

Answer 1

从评论来看，显然存在 DNS 缓存问题，其中“::ffff:67.215.65.145”作为 ruby​​gems 的有效地址返回。 “54.245.255.174”是一个有效地址，正如 dig @8.8.8.8 ANY ruby​​gems.org 所显示的那样。