Requesting a remote ip in plugin

Im creating plugin for limiting the ip, i have included the plugin
name in my controller

Controller:
class AdminController < ApplicationController

  acts_as_ratelimit

def login
    session[:user_id] = nil
  if request.post?
    user = User.authenticate(params[:name], params[:password])
    if user
      session[:user_id] = user.id
      redirect_to(:controller=>"products", :action => "new" )
    else
      flash.now[:notice] = "Invalid user/password combination"
    end
  end
end

my plugin was initialize properly but im facing the problem in getting
the remote ip in my plugin code .

i have included the line request.remote_ip for getting the ip address,
im facing the error us undefined method or variable as request

Is that any way to get the ip correctly.

@remote_ip = request.remote_ip

if apache is behind a mongrel remote_ip might not work and you would
have to do something similar:

@remote_ip = request.env["HTTP_X_FORWARDED_FOR"]

def login
  @remote_ip = request.remote_ip
..
  Your code
..
  logger.error("test: IP: #{@remote_ip}" )
end

Check your logs.

thank you i got the answer