dhcp-options on openwrt

參考 https://dongshao.blog.csdn.net/article/details/102713133

參考 https://openwrt.org/zh/docs/guide-user/base-system/dhcp_configuration

參考 http://www.networksorcery.com/enp/protocol/bootp/options.htm

參考 http://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.txt

 

如上圖，如果需要設置DHCP分配的網關地址為：192.168.1.254，那么只需要在DHCP-選項中輸入3,192.168.254即可。同理，如果想設置指定的DNS，輸入6,192.168.1.1即可將192.168.1.1分配給客戶端的DNS。

root@ACU:~# cat /etc/config/dhcp 

config dnsmasq
	option domainneeded '1'
	option boguspriv '1'
	option filterwin2k '0'
	option localise_queries '1'
	option rebind_protection '1'
	option rebind_localhost '1'
	option local '/lan/'
	option domain 'lan'
	option expandhosts '1'
	option nonegcache '0'
	option authoritative '1'
	option readethers '1'
	option leasefile '/tmp/dhcp.leases'
	option resolvfile '/tmp/resolv.conf.auto'
	option localservice '1'

config dhcp 'lan'
	option interface 'lan'
	option start '100'
	option limit '150'
	option leasetime '12h'
	list dhcp_option '3,172.17.143.254'
	list dhcp_option '6,114.114.114.114,8.8.8.8'

config dhcp 'SAT'
	option interface 'SAT'
	option ignore '1'

config dhcp '4G'
	option interface '4G'
	option ignore '1'

config dhcp 'wan'
	option interface 'wan'
	option ignore '1'

config odhcpd 'odhcpd'
	option maindhcp '0'
	option leasefile '/tmp/hosts/odhcpd'
	option leasetrigger '/usr/sbin/odhcpd-update'

root@ACU:~# 

 

The set of option-names known by dnsmasq can be discovered by running “dnsmasq --help dhcp”.

附DHCP設置相關參數含義：

Options號	Options作用
1	設置子網掩碼選項。
3	設置網關地址選項。
6	設置DNS服務器地址選項。
12	設置域名選項。
15	設置域名后綴選項。
33	設置靜態路由選項。該選項中包含一組有分類靜態路由（即目的地址的掩碼固定為自然掩碼，不能划分子網），客戶端收到該選項后，將在路由表中添加這些靜態路由。如果存在Option121，則忽略該選項。
44	設置NetBios服務器選項。
46	設置NetBios節點類型選項。
50	設置請求IP選項。
51	設置IP地址租約時間選項。
52	設置Option附加選項。
53	設置DHCP消息類型。
54	設置服務器標識。
55	設置請求參數列表選項。客戶端利用該選項指明需要從服務器獲取哪些網絡配置參數。該選項內容為客戶端請求的參數對應的選項值。
58	設置續約T1時間，一般是租期時間的50%。
59	設置續約T2時間。一般是租期時間的87.5%。
60	設置廠商分類信息選項，用於標識DHCP客戶端的類型和配置。
61	設置客戶端標識選項。
66	設置TFTP服務器名選項，用來指定為客戶端分配的TFTP服務器的域名。
67	設置啟動文件名選項，用來指定為客戶端分配的啟動文件名。
77	設置用戶類型標識。
121	設置無分類路由選項。該選項中包含一組無分類靜態路由（即目的地址的掩碼為任意值，可以通過掩碼來划分子網），客戶端收到該選項后，將在路由表中添加這些靜態路由。
148	EasyDeploy中Commander的IP地址。
149	SFTP和FTPS服務器的IP地址。
150	設置TFTP服務器地址選項，指定為客戶端分配的TFTP服務器的地址。

 

Code	Data length	Description	References
0	0	Pad.	RFC 2132
1	4	Subnet Mask.	RFC 2132
2	4	Time Offset (deprecated).	RFC 2132
3	4+	Router.	RFC 2132
4	4+	Time Server.	RFC 2132
5	4+	Name Server.	RFC 2132
6	4+	Domain Name Server.	RFC 2132
7	4+	Log Server.	RFC 2132
8	4+	Quote Server.	RFC 2132
9	4+	LPR Server.	RFC 2132
10	4+	Impress Server.	RFC 2132
11	4+	Resource Location Server.	RFC 2132
12	1+	Host Name.	RFC 2132
13	2	Boot File Size.	RFC 2132
14	1+	Merit Dump File.	RFC 2132
15	1+	Domain Name.	RFC 2132
16	4	Swap Server.	RFC 2132
17	1+	Root Path.	RFC 2132
18	1+	Extensions Path.	RFC 2132
19	1	IP Forwarding enable/disable.	RFC 2132
20	1	Non-local Source Routing enable/disable.	RFC 2132
21	8+	Policy Filter.	RFC 2132
22	2	Maximum Datagram Reassembly Size.	RFC 2132
23	1	Default IP Time-to-live.	RFC 2132
24	4	Path MTU Aging Timeout.	RFC 2132
25	2+	Path MTU Plateau Table.	RFC 2132
26	2	Interface MTU.	RFC 2132
27	1	All Subnets are Local.	RFC 2132
28	4	Broadcast Address.	RFC 2132
29	1	Perform Mask Discovery.	RFC 2132
30	1	Mask supplier.	RFC 2132
31	1	Perform router discovery.	RFC 2132
32	4	Router solicitation address.	RFC 2132
33	8+	Static routing table.	RFC 2132
34	1	Trailer encapsulation.	RFC 2132
35	4	ARP cache timeout.	RFC 2132
36	1	Ethernet encapsulation.	RFC 2132
37	1	Default TCP TTL.	RFC 2132
38	4	TCP keepalive interval.	RFC 2132
39	1	TCP keepalive garbage.	RFC 2132
40	1+	Network Information Service Domain.	RFC 2132
41	4+	Network Information Servers.	RFC 2132
42	4+	NTP servers.	RFC 2132
43	1+	Vendor specific information.	RFC 1533, RFC 2132
44	4+	NetBIOS over TCP/IP name server.	RFC 1533, RFC 2132
45	4+	NetBIOS over TCP/IP Datagram Distribution Server.	RFC 1533, RFC 2132
46	1	NetBIOS over TCP/IP Node Type.	RFC 1533, RFC 2132
47	1+	NetBIOS over TCP/IP Scope.	RFC 1533, RFC 2132
48	4+	X Window System Font Server.	RFC 1533, RFC 2132
49	4+	X Window System Display Manager.	RFC 1533, RFC 2132
50	4	Requested IP Address.	RFC 1533, RFC 2132
51	4	IP address lease time.	RFC 1533, RFC 2132
52	1	Option overload.	RFC 1533, RFC 2132
53	1	DHCP message type.	RFC 1533, RFC 2132, RFC 3203, RFC 4388
54	4	Server identifier.	RFC 1533, RFC 2132
55	1+	Parameter request list.	RFC 1533, RFC 2132
56	1+	Message.	RFC 1533, RFC 2132
57	2	Maximum DHCP message size.	RFC 1533, RFC 2132
58	4	Renew time value.	RFC 1533, RFC 2132
59	4	Rebinding time value.	RFC 1533, RFC 2132
60	1+	Class-identifier.	RFC 1533, RFC 2132
61	2+	Client-identifier.	RFC 1533, RFC 2132, RFC 4361
62	1 to 255	NetWare/IP Domain Name.	RFC 2242
63		NetWare/IP information.	RFC 2242
64	1+	Network Information Service+ Domain.	RFC 2132
65	4+	Network Information Service+ Servers.	RFC 2132
66	1+	TFTP server name.	RFC 2132
67	1+	Bootfile name.	RFC 2132
68	0+	Mobile IP Home Agent.	RFC 2132
69	4+	Simple Mail Transport Protocol Server.	RFC 2132
70	4+	Post Office Protocol Server.	RFC 2132
71	4+	Network News Transport Protocol Server.	RFC 2132
72	4+	Default World Wide Web Server.	RFC 2132
73	4+	Default Finger Server.	RFC 2132
74	4+	Default Internet Relay Chat Server.	RFC 2132
75	4+	StreetTalk Server.	RFC 2132
76	4+	StreetTalk Directory Assistance Server.	RFC 2132
77	Variable.	User Class Information.	RFC 3004
78	Variable.	SLP Directory Agent.	RFC 2610
79	Variable.	SLP Service Scope.	RFC 2610
80	0	Rapid Commit.	RFC 4039
81	4+.	FQDN, Fully Qualified Domain Name.	RFC 4702
82	Variable.	Relay Agent Information.	RFC 3046, RFC 5010
83	14+	Internet Storage Name Service.	RFC 4174
84			RFC 3679
85	Variable.	NDS servers.	RFC 2241
86	Variable.	NDS tree name.	RFC 2241
87	Variable.	NDS context.	RFC 2241
88	Variable.	BCMCS Controller Domain Name list.	RFC 4280
89	4+	BCMCS Controller IPv4 address list.	RFC 4280
90	Variable.	Authentication.	RFC 3118
91	4	client-last-transaction-time.	RFC 4388
92	4n	associated-ip.	RFC 4388
93	Variable.	Client System Architecture Type.	RFC 4578
94	Variable.	Client Network Interface Identifier.	RFC 4578
95	Variable.	LDAP, Lightweight Directory Access Protocol.	RFC 3679
96			RFC 3679
97	Variable.	Client Machine Identifier.	RFC 4578
98		Open Group's User Authentication.	RFC 2485
99		GEOCONF_CIVIC.	RFC 4776
100		IEEE 1003.1 TZ String.	RFC 4833
101		Reference to the TZ Database.	RFC 4833
102 - 111			RFC 3679
112	Variable.	NetInfo Parent Server Address.	RFC 3679
113	Variable.	NetInfo Parent Server Tag.	RFC 3679
114	Variable.	URL.	RFC 3679
115			RFC 3679
116	1	Auto-Configure	RFC 2563
117	2+	Name Service Search.	RFC 2937
118	4	Subnet Selection.	RFC 3011
119	Variable	DNS domain search list.	RFC 3397
120	Variable	SIP Servers DHCP Option.	RFC 3361
121	5+	Classless Static Route Option.	RFC 3442
122	Variable	CCC, CableLabs Client Configuration.	RFC 3495, RFC 3594, RFC 3634
123	16	GeoConf.	RFC 3825
124		Vendor-Identifying Vendor Class.	RFC 3925
125		Vendor-Identifying Vendor-Specific.	RFC 3925
126			RFC 3679
127			RFC 3679
128		TFTP Server IP address.	RFC 4578
129		Call Server IP address.	RFC 4578
130		Discrimination string.	RFC 4578
131		Remote statistics server IP address.	RFC 4578
132		802.1P VLAN ID.	RFC 4578
133		802.1Q L2 Priority.	RFC 4578
134		Diffserv Code Point.	RFC 4578
135		HTTP Proxy for phone-specific applications.	RFC 4578
136	4+	PANA Authentication Agent.	RFC 5192
137	variable	LoST Server.	RFC 5223
138		CAPWAP Access Controller addresses.	RFC 5417
139		OPTION-IPv4_Address-MoS.	RFC 5678
140		OPTION-IPv4_FQDN-MoS.	RFC 5678
141	2+	SIP UA Configuration Service Domains.	RFC 6011
142		OPTION-IPv4_Address-ANDSF.	RFC 6153
143		OPTION-IPv6_Address-ANDSF.	RFC 6153
144 - 149			RFC 3942
150		TFTP server address.	RFC 5859
150		Etherboot. GRUB configuration path name.
151		status-code.
152		base-time.
153		start-time-of-state.
154		query-start-time.
155		query-end-time.
156		dhcp-state.
157		data-source.
158 - 174			RFC 3942
175		Etherboot.
176		IP Telephone.
177		Etherboot. PacketCable and CableHome.
178 - 207			RFC 3942
208		pxelinux.magic (string) = F1:00:74:7E (241.0.116.126).	RFC 5071
209		pxelinux.configfile (text).	RFC 5071
210		pxelinux.pathprefix (text).	RFC 5071
211		pxelinux.reboottime (unsigned integer 32 bits).	RFC 5071
212	18+	OPTION_6RD.	RFC 5969
213		OPTION_V4_ACCESS_DOMAIN.	RFC 5986
214 - 219
220		Subnet Allocation.
221	1+	Virtual Subnet Selection.	RFC 6607
222 223			RFC 3942
224 - 254		Private use.
255	0	End.	RFC 2132

 

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