class Net::SSH::Proxy::Jump

end
…
Net::SSH.start(‘host’, ‘user’, :proxy => proxy) do |ssh|
proxy = Net::SSH::Proxy::Jump.new(‘user@proxy’)
require ‘net/ssh/proxy/jump’
Net::SSH.start:
then pass the instantiated object via the :proxy key to
An implementation of a jump proxy. To use it, instantiate it,

def build_proxy_command_equivalent(connection_options = nil)

option was specified during `Net::SSH.start`.
We cannot build the ProxyCommand template until we know if the :config 
def build_proxy_command_equivalent(connection_options = nil)
  first_jump, extra_jumps = jump_proxies.split(",", 2)
  config = connection_options && connection_options[:config]
  uri = URI.parse("ssh://#{first_jump}")
  template = "ssh".dup
  template << " -l #{uri.user}"    if uri.user
  template << " -p #{uri.port}"    if uri.port
  template << " -J #{extra_jumps}" if extra_jumps
  template << " -F #{config}" if config != true && config
  template << " -W %h:%p "
  template << uri.host
  @command_line_template = template
end

def initialize(jump_proxies)

[user@]host[:port].
Create a new socket factory that tunnels via multiple jump proxes as 
def initialize(jump_proxies)
  @jump_proxies = jump_proxies
end

def open(host, port, connection_options = nil)

proxy that was requested when the socket factory was instantiated.
Return a new socket connected to the given host and port via the jump 
def open(host, port, connection_options = nil)
  build_proxy_command_equivalent(connection_options)
  super
end