折腾了DD-WRT的动态DNS一翻，记录一下。
首先，由DD-WRT 的状态输出入可以得知，DD使用的是INADYN，如下。
[important]
DDNS 状态
Thu Jan 1 00:33:16 1970: INADYN: Started ‘INADYN Advanced version 1.96-ADV’ – dynamic DNS updater.
[/important]
知道之后就好办了，在网上可以查到INADYN的相关信息。INADYN是一款基于HTTP的DDNS更新器，通过发送HTTP请求来实现DDNS的更新。
官网：http://www.inatech.eu/inadyn/readme.html 说明如下。
[important]
Command line options
They are automatically printed if inadyn gets wrong parameters or if –help option is used.
Parameters:
‘–help’: help
‘-h’: help
‘–username’: your membername/ hash
‘-u’: your membername / hash
‘–password’: your password. Optional.
‘-p’: your password
‘–alias’:alias host name. this option can appear multiple times. (for each domain that has the same IP)
‘-a’: alias host name. this option can appear multiple times.
‘–input_file’: input file name that contains inadyn command options (adds to those already present in the cmd line). The default configuration file name is ‘/etc/inadyn.conf’. It is only used if inadyn is called without any command line options. This allows inadyn to be called without any arguments. The format is as expected for a **NIX config file. See below for details.
‘–ip_server_name[:port]url’: The client IP is detected by calling ‘url’ from this ‘ip_server_name:port’. Defaults to checkip.dyndns.org:80 /.
‘–dyndns_server_name’: [[:port]] The server that receives the update DNS request. If no proxy is wanted, then it is enough to set the dyndns system. The default servers will be taken.
‘–dyndns_server_url’ full URL relative to DynDNS server root.
‘–dyndns_system’: [NAME] – optional DYNDNS service type. SHOULD be one of the following:
-For dyndns.org DNS system: [email protected] OR [email protected] OR [email protected].
-For freedns.afraid.org DNS system: [email protected] .
-For the servcie ofered by zoneedit.com: [email protected].
-For no-ip.com : [email protected]
-For generic DNS system: custom@http_svr_basic_auth
DEFAULT value is intended for default service at dyndns.org: [email protected]
‘–proxy_server‘: [NAME[:port]] – the http proxy server name and port. Default is none.
‘–update_period‘: how often the IP is checked. The period is in [ms]. Default is about 1 min. Max is 10 days
‘–update_period_sec‘: how often the IP is checked. The period is in [sec]. Default is about 1 min. Max is 10 days
‘–forced_update_period‘: how often the IP is updated even if it is not changed. [in sec]
‘–log_file‘: log file path abd name
‘–background‘: runs in background. Output to syslog or to log file [if specified].
‘–verbose’: set dbg level. 0 to 5
‘–iterations‘: set the number of DNS updates. Default is 0, which means infinity.
‘–syslog‘: explicit set output to syslog. (e.g. /var/log/messages). Works on **NIX systems only.
‘–change_persona uid[:gid]’: After init changes user ID and group ID to the provided ones. This allows dropping unneeded [root] privileges after startup. Works for **NIX only.
[/important]
说说常用的几个参数：
–dyndns_system ：使用INADYN内的预设配置，会自动根据其内部配置在HTTP 请求上添加相关参数。
–verbose ：详尽地查看INADYN的运行状态，可以看见发送的HTTP请求，用于Debug。
–ip_server_name ：设置INADYN的IP检查器，当你的DD-WRT在内网或者DDNS的供应商自动获取的IP不正确，这个参数就有用了。
首先，要得知花生壳的HTTP协议，可以在 这里 找到，如下。
[important]
http://username:[email protected]/ph/update?hostname=yourhostname&myip=ipaddress
[/important]
通过上面的资料配置DD提供的参数即可。因为花生壳的参数配置与INYDYN默认的配置基本适配，所以直接按DD-WRT要求填写即可。
[important]
DDNS服务：自定义
DYNDNS 服务器：ddns.oray.com
用户名：username
密码：password
主机名：YourDDnsDomain
URL：/ph/update?hostname=
DDNS 附加选项：–verbose 5
[/important]
如果你看见DDNS状态的最后打印“good YourIP” 就说明你的DDNS已经成功更新了
如果你遇到特殊情况请按下面的处理。
成功更新后返回的IP和你的路由上的不一致，如果是类似长城宽带这些网络供应商可能会出现这样的问题，他们的HTTP可能经过其他服务器加速导致发送HTTP请求的IP与你的IP不一致。
这时就需要使用–ip_server_name 参数，比如使用ip138.com提供的本机IP可以这样写。
[important]
–ip_server_name 20140507.ip138.com /ic.asp
这个地址可以通过在ip138.com的主页查看页面源码找到。
需要注意的是.com后面的空格
[/important]
加上这个参数后你会发现，INADYN发送的请求没有加上myip= 这个参数，这时你可以调用其他默认配置的参数。
[important]
–dyndns_system [email protected]
[/important]
OK，应该可以看见正确地返回你的IP了。
至于 花生壳 服务器返回 “badauth” 是你的用户名或(和)密码错误，请核对。
如果确实正确，那么就是花生壳的服务器有问题了。
如果你想DDNS更新更为频繁可以使用–update_period_sec参数。
[important]
–update_period_sec 1200
上面的设置是每20分钟发送一次请求
[/important]