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OpenWrt之DNS设置
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文章目录
OpenWrt之DNS设置0.前言1.WAN口2.Lan口3.LAN口DHCP选项4.DHCP/DNS5.总结参考（Thanks）附录.DHCP OPTION
OpenWrt之DNS设置
0.前言
本文不涉及smartdns、adguardhome、dns防污染等内容，只介绍DNS的设置 1.WAN口
保存&应用后 客户机发出dns解析请求后路由器用上面的dns回应 2.Lan口进入openwrt的luci页面。在 网络>网卡>LAN 选择编辑
保存&应用后,路由器自身的dns解析请求 会使用 上面设置的DNS 来回应 3.LAN口DHCP选项进入openwrt的luci页面。在 网络>网卡>LAN 选择编辑
在 DHCP选项下 填入 6,223.5.5.5,119.29.29.29效果如下：
该设置会修改连接到路由器LAN的DNS（类似于自定义电脑的DNS）
电脑DNS（LAN） > DHCP的DNS > WAN口DNS 1.最常用的DNS设置方式。可以由DHCP请求获得，或自行设置。在静态IP的情况下，必须设置，否则无法查询外面的主机 2.如果路由器用于桥接方式，并且使用静态IP时，无法用DHCP请求的方式得到DNS，这是该选项的主要用途。其他场合下，则会忽略由DHCP服务器的DNS设置，改用这个设置。 3.如果该机器是子网的DHCP服务器，用于设置DHCP客户端的DNS。如果留空，默认则用自身的IP。通常客户端看到的DNS是这个（手机，电脑等） 4.如果自己是子网的DNS服务器，用于设置转发服务器。如果不设置，则用上游DNS（由1或2）服务器 当第2、3、4项不设置时，默认使用1的DNS解析 参考（Thanks）https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#options https://blog.csdn.net/weixin_41632560/article/details/89448612 https://www.right.com.cn/forum/thread-4059633-1-1.html 附录.DHCP OPTION以下是部分DHCP OPTION参照表 DHCP OPTIONMeaing0None1设置子网掩码2"Time Offset in Seconds from UTC3设置网关4N/4 Timeserver addresses5N/4 IEN-116 Server addresses6设置DNS服务器7N/4 Logging Server addresses8N/4 Quotes Server addresses9N/4 Printer Server addresses10N/4 Impress Server addresses11N/4 RLP Server addresses12设置域名选项。13Size of boot file in 512 byte chunks14Client to dump and name the file to dump it to15设置域名后缀选项。16Swap Server address17Path name for root disk18Path name for more BOOTP info19Enable/Disable IP Forwarding20Enable/Disable Source Routing21Routing Policy Filters22Max Datagram Reassembly Size23Default IP Time to Live24Path MTU Aging Timeout25Path MTU Plateau Table26Interface MTU Size27All Subnets are Local28Broadcast Address29Perform Mask Discovery30Provide Mask to Others31Perform Router Discovery32Router Solicitation Address33设置静态路由选项。该选项中包含一组有分类静态路由（即目的地址的掩码固定为自然掩码，不能划分子网），客户端收到该选项后，将在路由表中添加这些静态路由。如果存在Option121，则忽略该选项。34Trailer Encapsulation35ARP Cache Timeout36Ethernet Encapsulation37Default TCP Time to Live38TCP Keepalive Interval39TCP Keepalive Garbage40NIS Domain Name41NIS Server Addresses42NTP Server Addresses43Vendor Specific Information44设置NetBios服务器选项。45NETBIOS Datagram Distribution46设置NetBios节点类型选项。47NETBIOS Scope48X Window Font Server49X Window Display Manager50设置请求IP选项。51设置IP地址租约时间选项。52设置Option附加选项。53设置DHCP消息类型。54设置服务器标识。55设置请求参数列表选项。客户端利用该选项指明需要从服务器获取哪些网络配置参数。该选项内容为客户端请求的参数对应的选项值。56DHCP Error Message57DHCP Maximum Message Size58设置续约T1时间，一般是租期时间的50%。59设置续约T2时间。一般是租期时间的87.5%。60设置厂商分类信息选项，用于标识DHCP客户端的类型和配置。61设置客户端标识选项。62NetWare/IP Domain Name63NetWare/IP sub Options64NIS+ v3 Client Domain Name65NIS+ v3 Server Addresses66设置TFTP服务器名选项，用来指定为客户端分配的TFTP服务器的域名。67设置启动文件名选项，用来指定为客户端分配的启动文件名。68Home Agent Addresses69Simple Mail Server Addresses70Post Office Server Addresses71Network News Server Addresses72WWW Server Addresses73Finger Server Addresses74Chat Server Addresses75StreetTalk Server Addresses76ST Directory Assist. Addresses77设置用户类型标识。78directory agent information79service location agent scope80Rapid Commit81Fully Qualified Domain Name82Relay Agent Information83Internet Storage Name Service85Novell Directory Services86Novell Directory Services87Novell Directory Services90Authentication93Client System Architecture94Client Network Device Interface95Lightweight Directory Access Protocol97UUID/GUID-based Client Identifier98Open Group’s User Authentication100IEEE 1003.1 TZ String101Reference to the TZ Database108Number of seconds that DHCPv4 should be disabled109DHCPv4 over DHCPv6 Softwire Source Address Option112NetInfo Parent Server Address113NetInfo Parent Server Tag114DHCP Captive-Portal116DHCP Auto-Configuration117Name Service Search118Subnet Selection Option119DNS domain search list120SIP Servers DHCP Option121设置无分类路由选项。该选项中包含一组无分类静态路由（即目的地址的掩码为任意值，可以通过掩码来划分子网），客户端收到该选项后，将在路由表中添加这些静态路由。122CableLabs Client Configuration123GeoConf Option124Vendor-Identifying Vendor Class125Vendor-Identifying Vendor-Specific Information138CAPWAP Access Controller addresses139a series of suboptions140a series of suboptions141List of domain names to search for SIP User Agent Configuration142ANDSF IPv4 Address Option for DHCPv4143This option provides a list of URIs for SZTP bootstrap servers144Geospatial Location with Uncertainty145Forcerenew Nonce Capable146Information for selecting RDNSS147The name of the peer DOTS agent.148N/4 IPv4 addresses of peer DOTS agent(s).150设置TFTP服务器地址选项，指定为客户端分配的TFTP服务器的地址。151Status code and optional N byte text message describing status.152“Absolute time (seconds since Jan 1, 1970) message was sent.”153Number of seconds in the past when client entered current state.154“Absolute time (seconds since Jan 1, 1970) for beginning of query.”155“Absolute time (seconds since Jan 1, 1970) for end of query.”156State of IP address.157Indicates information came from local or remote server.158Includes one or multiple lists of PCP server IP addresses; each list is treated as a separate PCP server.159This option is used to configure a set of ports bound to a shared IPv4 address.160Previously assigned by [RFC7710]; known to also be used by Polycom.161Manufacturer Usage Descriptions |
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