通过访问终端中的网页（http）来更改 DynDns

Question

通常服务器就是这样做的，它提供服务，假设你正在谈论的是 HTTP 服务器。

在大多数情况下，路由器 - DSL 调制解调器负责执行此类操作。请检查以下内容，看看是否适用于您的情况：

典型的家庭用户几乎每次连接到互联网或租约结束时都会从其 ISP 获取动态 IP 地址。

当此类用户想要托管一个可访问互联网的家庭服务器时，必须在以下两种解决方案之间进行选择：

支付静态 IP
查找动态 DNS 服务

使用第二种解决方案时，应注意以下事项：

用户保持 IP 的动态特性
每次为用户分配新的动态 IP 时，用户都会通知动态 DNS 服务。
动态 DNS 服务将用户的 IP 映射到 URL。

上述过程的第二部分通常由用户的路由器（DSL 调制解调器）或用户计算机（服务器）中运行的守护进程（服务）应用程序完成。该服务登录到动态 DNS 提供商并通知提供商用户当前的 IP 地址。

要完成上述任务，首先查看路由器 - DSM 调制解调器设置，这是最干净、最简单的方法。如果调制解调器不支持此功能，请咨询 ISP 是否提供用于此任务的应用程序。最后，每次获取新 IP 或每 n 分钟（通常不少于 10 分钟）在服务器中运行脚本。

向动态 DNS 服务报告已获取新 IP 的各种方法的示例：

更新客户端应用程序示例
DSL 调制解调器设置
Shell 脚本如下，摘自http://www.changeip.com/accounts/downloads.php

/bin/bash #!/bin/bash

#################################################################
## ChangeIP.com bash update script                             ##
#################################################################
## Written 3/18/09 by Tom Rinker, released to the Public Domain##
#################################################################
## This is a simple bash script to preform a dDNS update with  ##
## ChangeIP.com. It uses only bash and wget, and so should be  ##
## compatible with virtually any UNIX/Linux based system with  ##
## bash. It is intended to be executed as a cron job, and      ##
## will only execute an update of dDNS records when the IP     ##
## address changes. As ChangeIP.com dDNS records have a 5 min  ##
## Time-To-Live, it is basically pointless and wasteful to     ##
## execute it more often than every 5 minutes. This script     ##
## supports logging all activity, in 3 available log levels,   ##
## and supports simple management of log file size.            ##
#################################################################
## To use this script:                                         ##
## 1) set the variables in the script below                    ##
## 2) execute the script as a cron job                         ##
#################################################################
## WARNING: This script has two potential security holes.      ##
## First, the username and password are stored plaintext in    ##
## the script, so a system user who has read access to the     ##
## script could read them. This risk can be mitigated with     ##
## careful use of file permissions on the script.              ##
## Second, the username and password will show briefly to other##
## users of the system via ps, w, or top. This risk can be     ##
## mitigated by moving the username and password to .wgetrc    ##
## This level of security is acceptable for some installations ##
## including my own, but may be unacceptable for some users.   ##
#################################################################

################ Script Variables ###############################
IPPATH=/var/log/IP                    # IP address storage file
TMPIP=/tmp/tmpIP                      # Temp IP storage file
LOGPATH=/var/log/changeip.log         # Log file
TEMP=/tmp/temp                        # Temp storage file
CIPUSER=                              # ChangeIP.com Username
CIPPASS=                              # ChangeIP.com Password
CIPSET=1                              # ChangeIP.com recordset
LOGLEVEL=2                            # 0=off,1=normal,2=verbose
LOGMAX=500                            # Max log lines, 0=unlimited
#################################################################

# get current IP from ip.changeip.com, and store in $TEMP
wget -q -U "rinker.sh wget 1.0" -O $TEMP ip.changeip.com

# parse $TEMP for the ip, and store in $TMPIP
grep IPADDR < $TEMP | cut -d= -s -f2 | cut -d- -s -f1 > $TMPIP

# compare $IPPATH with $TMPIP, and if different, execute update
if diff $IPPATH $TMPIP > /dev/null
  then                                # same IP, no update
      if [ $LOGLEVEL -eq 2 ]
        then                          # if verbose, log no change
          echo "--------------------------------" >> $LOGPATH
          date >> $LOGPATH             
          echo "No Change" >> $LOGPATH
          echo -e "IP: \c" >> $LOGPATH
          cat $IPPATH >> $LOGPATH
      fi
  else                                # different IP, execute update
      wget -q -U "rinker.sh wget 1.0" -O $TEMP --http-user=$CIPUSER --http-password=$CIPPASS "https://nic.changeip.com/nic/update?cmd=update&set=$CIPSET"
      if [ $LOGLEVEL -ne 0 ]
        then                          # if logging, log update
          echo "--------------------------------" >> $LOGPATH
          date >> $LOGPATH             
          echo "Updating" >> $LOGPATH
          echo -e "NewIP: \c" >> $LOGPATH
          cat $TMPIP >> $LOGPATH
          if [ $LOGLEVEL -eq 2 ]
            then                      # verbose logging
              echo -e "OldIP: \c" >> $LOGPATH
              cat $IPPATH >> $LOGPATH
              cat $TEMP >> $LOGPATH   # log the ChangeIP.com update reply
          fi
      fi
      cp $TMPIP $IPPATH               # Store new IP
fi

# if $LOGMAX not equal to 0, reduce log size to last $LOGMAX number of lines
if [ $LOGMAX -ne 0 ]
  then
      tail -n $LOGMAX $LOGPATH > $TEMP
      cp $TEMP $LOGPATH
fi

Answer 1