Ruby：Ping.pingecho缺失

% rvm use 1.8.7
Using ~/.rvm/gems/ruby-1.8.7-p334
% ruby -rping -e 'p Ping.pingecho "127.0.0.1"'
true
% rvm use 1.9.2
Using ~/.rvm/gems/ruby-1.9.2-p180
% ruby -rping -e 'p Ping.pingecho "127.0.0.1"'
<internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- ping (LoadError)
        from <internal:lib/rubygems/custom_require>:29:in `require'
% ruby -e 'p Ping.pingecho "127.0.0.1"'
-e:1:in `<main>': uninitialized constant Object::Ping (NameError)

它移动到不同的库(所以我需要加载它吗？),或者
它已被删除,并替换为不同的模块(那么我应该用什么来确定IP是否可以访问？).

require 'timeout'
require 'socket'

class Ping 
  def self.pingecho(host, timeout=5, service="echo")
    begin
      timeout(timeout) do
        s = TCPSocket.new(host, service)
        s.close
      end
    rescue Errno::ECONNREFUSED
      return true
    rescue   Timeout::Error, StandardError 
      return false 
    end
    return true
  end
end

p Ping.pingecho("127.0.0.1") #=> true
p Ping.pingecho("localhost") #=> true