获取ip问题

Question

Request.ServerVariables.Get("Remote_Addr").ToString();
Request.ServerVariables.Get("Local_Addr").ToString();
Request.UserHostAddress.ToString()；这些都有什么区别呢？怎么获得客户端ip还有服务器端ip呢？谢谢。

Answer 1

   /// <summary>
        /// 获取用户IP
        /// </summary>
        /// <returns>返回用户IP</returns>
        public static string GetIp()
        {
            string user_IP;
            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)
            {
                user_IP = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
            }
            else
            {
                user_IP = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
            }
            return user_IP;
        }