2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
9 bool "udhcp server (udhcpd)"
13 udhcpd is a DHCP server geared primarily toward embedded systems,
14 while striving to be fully functional and RFC compliant.
21 dhcprelay listens for dhcp requests on one or more interfaces
22 and forwards these requests to a different interface or dhcp
26 bool "Lease display utility (dumpleases)"
30 dumpleases displays the leases written out by the udhcpd server.
31 Lease times are stored in the file by time remaining in lease, or
32 by the absolute time that it expires in seconds from epoch.
34 config FEATURE_UDHCPD_WRITE_LEASES_EARLY
35 bool "Rewrite the lease file at every new acknowledge"
39 If selected, udhcpd will write a new file with leases every
40 time a new lease has been accepted, thus eliminating the need
41 to send SIGUSR1 for the initial writing or updating. Any timed
42 rewriting remains undisturbed.
44 config FEATURE_UDHCPD_BASE_IP_ON_MAC
45 bool "Select IP address based on client MAC"
49 If selected, udhcpd will base its selection of IP address to offer
50 on the client's hardware address. Otherwise udhcpd uses the next
51 consecutive free address.
53 This reduces the frequency of IP address changes for clients
54 which let their lease expire, and makes consecutive DHCPOFFERS
55 for the same client to (almost always) contain the same
58 config DHCPD_LEASES_FILE
59 string "Absolute path to lease file"
60 default "/var/lib/misc/udhcpd.leases"
63 udhcpd stores addresses in a lease file. This is the absolute path
64 of the file. Normally it is safe to leave it untouched.
67 bool "udhcp client (udhcpc)"
71 udhcpc is a DHCP client geared primarily toward embedded systems,
72 while striving to be fully functional and RFC compliant.
74 The udhcp client negotiates a lease with the DHCP server and
75 runs a script when a lease is obtained or lost.
77 config FEATURE_UDHCPC_ARPING
78 bool "Verify that the offered address is free, using ARP ping"
82 If selected, udhcpc will send ARP probes and make sure
83 the offered address is really not in use by anyone. The client
84 will DHCPDECLINE the offer if the address is in use,
85 and restart the discover process.
87 config FEATURE_UDHCP_PORT
88 bool "Enable '-P port' option for udhcpd and udhcpc"
90 depends on UDHCPD || UDHCPC
92 At the cost of ~300 bytes, enables -P port option.
93 This feature is typically not needed.
96 int "Maximum verbosity level for udhcp applets (0..9)"
99 depends on UDHCPD || UDHCPC || DHCPRELAY
101 Verbosity can be increased with multiple -v options.
102 This option controls how high it can be cranked up.
104 Bigger values result in bigger code. Levels above 1
105 are very verbose and useful for debugging only.
107 config FEATURE_UDHCP_RFC3397
108 bool "Support for RFC3397 domain search (experimental)"
110 depends on UDHCPD || UDHCPC
112 If selected, both client and server will support passing of domain
113 search lists via option 119, specified in RFC 3397,
114 and SIP servers option 120, specified in RFC 3361.
116 config FEATURE_UDHCP_RFC5969
117 bool "Support for RFC5969 IPv6 Rapid Deployment (6RD)"
119 depends on FEATURE_IPV6 && UDHCPC
123 config FEATURE_UDHCP_8021Q
124 bool "Support for 802.1Q VLAN parameters"
126 depends on UDHCPD || UDHCPC
128 If selected, both client and server will support passing of VLAN
129 ID and priority via options 132 and 133 as per 802.1Q.
131 config UDHCPC_DEFAULT_SCRIPT
132 string "Absolute path to config script"
133 default "/usr/share/udhcpc/default.script"
136 This script is called after udhcpc receives an answer. See
137 examples/udhcp for a working example. Normally it is safe
138 to leave this untouched.
140 config UDHCPC_SLACK_FOR_BUGGY_SERVERS
141 int "DHCP options slack buffer size"
144 depends on UDHCPD || UDHCPC
146 Some buggy DHCP servers send DHCP offer packets with option
147 field larger than we expect (which might also be considered a
148 buffer overflow attempt). These packets are normally discarded.
149 If circumstances beyond your control force you to support such
150 servers, this may help. The upper limit (924) makes dhcpc accept
151 even 1500 byte packets (maximum-sized ethernet packets).
153 This option does not make dhcp[cd] emit non-standard
156 Known buggy DHCP servers:
157 3Com OfficeConnect Remote 812 ADSL Router:
158 seems to confuse maximum allowed UDP packet size with
159 maximum size of entire IP packet, and sends packets which are
161 Seednet (ISP) VDSL: sends packets 2 bytes too large.