DHCP Option字段

本文深入探讨了DHCP协议中的Option字段,详细解析了各个选项的含义和用途,帮助读者全面掌握网络配置动态主机分配协议的关键细节。

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Tag Name Data Length Meaning Reference 
0Pad0None[RFC2132]
1Subnet Mask4Subnet Mask Value[RFC2132]
2Time Offset4Time Offset in Seconds from UTC (note: deprecated by 100 and 101)[RFC2132]
3RouterNN/4 Router addresses[RFC2132]
4Time ServerNN/4 Timeserver addresses[RFC2132]
5Name ServerNN/4 IEN-116 Server addresses[RFC2132]
6Domain ServerNN/4 DNS Server addresses[RFC2132]
7Log ServerNN/4 Logging Server addresses[RFC2132]
8Quotes ServerNN/4 Quotes Server addresses[RFC2132]
9LPR ServerNN/4 Printer Server addresses[RFC2132]
10Impress ServerNN/4 Impress Server addresses[RFC2132]
11RLP ServerNN/4 RLP Server addresses[RFC2132]
12HostnameNHostname string[RFC2132]
13Boot File Size2Size of boot file in 512 byte chunks[RFC2132]
14Merit Dump FileNClient to dump and name the file to dump it to[RFC2132]
15Domain NameNThe DNS domain name of the client[RFC2132]
16Swap ServerNSwap Server address[RFC2132]
17Root PathNPath name for root disk[RFC2132]
18Extension FileNPath name for more BOOTP info[RFC2132]
19Forward On/Off1Enable/Disable IP Forwarding[RFC2132]
20SrcRte On/Off1Enable/Disable Source Routing[RFC2132]
21Policy FilterNRouting Policy Filters[RFC2132]
22Max DG Assembly2Max Datagram Reassembly Size[RFC2132]
23Default IP TTL1Default IP Time to Live[RFC2132]
24MTU Timeout4Path MTU Aging Timeout[RFC2132]
25MTU PlateauNPath MTU Plateau Table[RFC2132]
26MTU Interface2Interface MTU Size[RFC2132]
27MTU Subnet1All Subnets are Local[RFC2132]
28Broadcast Address4Broadcast Address[RFC2132]
29Mask Discovery1Perform Mask Discovery[RFC2132]
30Mask Supplier1Provide Mask to Others[RFC2132]
31Router Discovery1Perform Router Discovery[RFC2132]
32Router Request4Router Solicitation Address[RFC2132]
33Static RouteNStatic Routing Table[RFC2132]
34Trailers1Trailer Encapsulation[RFC2132]
35ARP Timeout4ARP Cache Timeout[RFC2132]
36Ethernet1Ethernet Encapsulation[RFC2132]
37Default TCP TTL1Default TCP Time to Live[RFC2132]
38Keepalive Time4TCP Keepalive Interval[RFC2132]
39Keepalive Data1TCP Keepalive Garbage[RFC2132]
40NIS DomainNNIS Domain Name[RFC2132]
41NIS ServersNNIS Server Addresses[RFC2132]
42NTP ServersNNTP Server Addresses[RFC2132]
43Vendor SpecificNVendor Specific Information[RFC2132]
44NETBIOS Name SrvNNETBIOS Name Servers[RFC2132]
45NETBIOS Dist SrvNNETBIOS Datagram Distribution[RFC2132]
46NETBIOS Node Type1NETBIOS Node Type[RFC2132]
47NETBIOS ScopeNNETBIOS Scope[RFC2132]
48X Window FontNX Window Font Server[RFC2132]
49X Window ManagerNX Window Display Manager[RFC2132]
50Address Request4Requested IP Address[RFC2132]
51Address Time4IP Address Lease Time[RFC2132]
52Overload1Overload "sname" or "file"[RFC2132]
53DHCP Msg Type1DHCP Message Type[RFC2132]
54DHCP Server Id4DHCP Server Identification[RFC2132]
55Parameter ListNParameter Request List[RFC2132]
56DHCP MessageNDHCP Error Message[RFC2132]
57DHCP Max Msg Size2DHCP Maximum Message Size[RFC2132]
58Renewal Time4DHCP Renewal (T1) Time[RFC2132]
59Rebinding Time4DHCP Rebinding (T2) Time[RFC2132]
60Class IdNClass Identifier[RFC2132]
61Client IdNClient Identifier[RFC2132]
62NetWare/IP DomainNNetWare/IP Domain Name[RFC2242]
63NetWare/IP OptionNNetWare/IP sub Options[RFC2242]
64NIS-Domain-NameNNIS+ v3 Client Domain Name[RFC2132]
65NIS-Server-AddrNNIS+ v3 Server Addresses[RFC2132]
66Server-NameNTFTP Server Name[RFC2132]
67Bootfile-NameNBoot File Name[RFC2132]
68Home-Agent-AddrsNHome Agent Addresses[RFC2132]
69SMTP-ServerNSimple Mail Server Addresses[RFC2132]
70POP3-ServerNPost Office Server Addresses[RFC2132]
71NNTP-ServerNNetwork News Server Addresses[RFC2132]
72WWW-ServerNWWW Server Addresses[RFC2132]
73Finger-ServerNFinger Server Addresses[RFC2132]
74IRC-ServerNChat Server Addresses[RFC2132]
75StreetTalk-ServerNStreetTalk Server Addresses[RFC2132]
76STDA-ServerNST Directory Assist. Addresses[RFC2132]
77User-ClassNUser Class Information[RFC3004]
78Directory AgentNdirectory agent information[RFC2610]
79Service ScopeNservice location agent scope[RFC2610]
80Rapid Commit0Rapid Commit[RFC4039]
81Client FQDNNFully Qualified Domain Name[RFC4702]
82Relay Agent InformationNRelay Agent Information[RFC3046]
83iSNSNInternet Storage Name Service[RFC4174]
84REMOVED/Unassigned  [RFC3679]
85NDS ServersNNovell Directory Services[RFC2241]
86NDS Tree NameNNovell Directory Services[RFC2241]
87NDS ContextNNovell Directory Services[RFC2241]
88BCMCS Controller Domain Name list  [RFC4280]
89BCMCS Controller IPv4 address option  [RFC4280]
90AuthenticationNAuthentication[RFC3118]
91client-last-transaction-time option  [RFC4388]
92associated-ip option  [RFC4388]
93Client SystemNClient System Architecture[RFC4578]
94Client NDINClient Network Device Interface[RFC4578]
95LDAPNLightweight Directory Access Protocol[RFC3679]
96REMOVED/Unassigned  [RFC3679]
97UUID/GUIDNUUID/GUID-based Client Identifier[RFC4578]
98User-AuthNOpen Group's User Authentication[RFC2485]
99GEOCONF_CIVIC  [RFC4776]
100PCodeNIEEE 1003.1 TZ String[RFC4833]
101TCodeNReference to the TZ Database[RFC4833]
102-107REMOVED/Unassigned  [RFC3679]
108REMOVED/Unassigned  [RFC3679]
109Unassigned  [RFC3679]
110REMOVED/Unassigned  [RFC3679]
111Unassigned  [RFC3679]
112Netinfo AddressNNetInfo Parent Server Address[RFC3679]
113Netinfo TagNNetInfo Parent Server Tag[RFC3679]
114URLNURL[RFC3679]
115REMOVED/Unassigned  [RFC3679]
116Auto-ConfigNDHCP Auto-Configuration[RFC2563]
117Name Service SearchNName Service Search[RFC2937]
118Subnet Selection Option4Subnet Selection Option[RFC3011]
119Domain SearchNDNS domain search list[RFC3397]
120SIP Servers DHCP OptionNSIP Servers DHCP Option[RFC3361]
121Classless Static Route OptionNClassless Static Route Option[RFC3442]
122CCCNCableLabs Client Configuration[RFC3495]
123GeoConf Option16GeoConf Option[RFC6225]
124V-I Vendor Class Vendor-Identifying Vendor Class[RFC3925]
125V-I Vendor-Specific Information Vendor-Identifying Vendor-Specific Information[RFC3925]
126Removed/Unassigned  [RFC3679]
127Removed/Unassigned  [RFC3679]
128PXE - undefined (vendor specific)  [RFC4578]
128Etherboot signature. 6 bytes: E4:45:74:68:00:00   
128DOCSIS "full security" server IP address   
128TFTP Server IP address (for IP Phone software load)   
129PXE - undefined (vendor specific)  [RFC4578]
129Kernel options. Variable length string   
129Call Server IP address   
130PXE - undefined (vendor specific)  [RFC4578]
130Ethernet interface. Variable length string.   
130Discrimination string (to identify vendor)   
131PXE - undefined (vendor specific)  [RFC4578]
131Remote statistics server IP address   
132PXE - undefined (vendor specific)  [RFC4578]
132IEEE 802.1Q VLAN ID   
133PXE - undefined (vendor specific)  [RFC4578]
133IEEE 802.1D/p Layer 2 Priority   
134PXE - undefined (vendor specific)  [RFC4578]
134Diffserv Code Point (DSCP) for VoIP signalling and media streams   
135PXE - undefined (vendor specific)  [RFC4578]
135HTTP Proxy for phone-specific applications   
136OPTION_PANA_AGENT  [RFC5192]
137OPTION_V4_LOST  [RFC5223]
138OPTION_CAPWAP_AC_V4NCAPWAP Access Controller addresses[RFC5417]
139OPTION-IPv4_Address-MoSNa series of suboptions[RFC5678]
140OPTION-IPv4_FQDN-MoSNa series of suboptions[RFC5678]
141SIP UA Configuration Service DomainsNList of domain names to search for SIP User Agent Configuration[RFC6011]
142OPTION-IPv4_Address-ANDSFNANDSF IPv4 Address Option for DHCPv4[RFC6153]
143OPTION-IPv6_Address-ANDSFNANDSF IPv6 Address Option for DHCPv6[RFC6153]
144GeoLoc16Geospatial Location with Uncertainty[RFC6225]
145FORCERENEW_NONCE_CAPABLE1Forcerenew Nonce Capable[RFC-ietf-dhc-forcerenew-nonce-07]
146-149Unassigned  [RFC3942]
150TFTP server address  [RFC5859]
150Etherboot   
150GRUB configuration path name   
151-174Unassigned  [RFC3942]
175Etherboot (Tentatively Assigned - 2005-06-23)   
176IP Telephone (Tentatively Assigned - 2005-06-23)   
177Etherboot (Tentatively Assigned - 2005-06-23)   
177PacketCable and CableHome (replaced by 122)   
178-207Unassigned  [RFC3942]
208PXELINUX Magic4magic string = F1:00:74:7E[RFC5071][Deprecated]
209Configuration FileNConfiguration file[RFC5071]
210Path PrefixNPath Prefix Option[RFC5071]
211Reboot Time4Reboot Time[RFC5071]
212OPTION_6RD18 + NOPTION_6RD with N/4 6rd BR addresses[RFC5969]
213OPTION_V4_ACCESS_DOMAINNAccess Network Domain Name[RFC5986]
214-219Unassigned   
220Subnet Allocation OptionNSubnet Allocation Option[draft-ietf-dhc-subnet-alloc-13]
221Virtual Subnet Selection (VSS) Option  [RFC6607]
222-223Unassigned  [RFC3942]
224-254Reserved (Private Use)   
255End0None[RFC2132]

转载自IANA

<think>嗯,用户遇到了一个Vue的警告,提示在index.vue的第122行有一个组件触发了"node-expand"事件,但没有在emits选项中声明,也没有作为onNodeExpand的prop。我需要帮他们解决这个问题。首先,我得回忆一下Vue的相关知识。 Vue 3中,组件触发的事件需要在emits选项中显式声明,这样可以提高代码的可读性和维护性。如果组件触发了一个未被声明的事件,Vue会给出警告。另外,用户提到的onNodeExpand prop可能是父组件通过v-on或@语法监听的事件,但子组件没有正确声明emits,导致警告出现。 那解决方法应该是让用户在子组件的emits选项中添加"node-expand"事件的声明。比如,在组件的选项中,添加emits: ['node-expand']。或者,如果使用的是setup语法,可以通过defineEmits来声明。同时,检查父组件是否正确使用@node-expand或v-on:node-expand来监听事件,确保事件名称一致。 另外,用户可能混淆了props和事件监听。父组件监听子组件的事件应该用@事件名,而prop是用来传递数据的。所以需要确认子组件是否正确使用$emit触发事件,父组件是否正确监听。 总结下来,步骤应该是:在子组件中声明emits选项,包括"node-expand",确保触发事件时使用正确的名称,并检查父组件的监听方式是否正确。这样应该就能解决警告了。</think>这个Vue警告表示组件触发了未声明的事件,解决方法如下: **三步解决警告:** 1. **声明组件事件(推荐方案)** ```javascript // 在触发事件的组件中添加emits选项 export default { emits: ['node-expand'], // 新增事件声明 methods: { handleExpand() { this.$emit('node-expand', data) // 触发事件 } } } ``` 2. **组合式API声明方式(适用于setup语法)** ```javascript // 使用<script setup>时 const emit = defineEmits(['node-expand']) // 声明事件 function expandHandler() { emit('node-expand', payload) // 触发事件 } ``` 3. **兼容性处理(临时方案)** ```javascript // 在组件选项中关闭事件校验(不建议长期使用) export default { emits: null, // 关闭所有验证 // 或 emits: { 'node-expand': null // 仅关闭该事件的验证 } } ``` **问题原因分析:** 1. **Vue 3的组件验证机制**(Vue 2的`model`选项已被替代) 2. **未遵循选项式API规范**,事件需要显式声明 3. **父子组件通信机制**要求明确定义接口 **完整最佳实践:** 父组件示例: ```vue <template> <ChildComponent @node-expand="handleExpand" /> </template> ``` 子组件规范写法: ```javascript export default { emits: ['node-expand'], // 声明允许触发的事件 methods: { triggerEvent() { this.$emit('node-expand', { /* 传递数据 */ }) } } } ``` **验证是否生效:** 1. 检查控制台警告是否消失 2. 确保事件名称完全一致(区分大小写) 3. 验证父子组件的事件参数传递是否正常 **扩展建议:** - 使用TypeScript时可添加事件类型声明 - 对于复杂组件建议维护`emits`类型声明文件 - 遵循Vue官方风格指南的事件命名规范(kebab-case) 按照上述方案处理后,即可消除组件的事件验证警告,同时提升代码的可维护性。
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