2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
9 bool "udhcp server (udhcpd)"
11 depends on PLATFORM_LINUX
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)"
69 depends on PLATFORM_LINUX
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 UDHCPC_DEFAULT_SCRIPT
117 string "Absolute path to config script"
118 default "/usr/share/udhcpc/default.script"
121 This script is called after udhcpc receives an answer. See
122 examples/udhcp for a working example. Normally it is safe
123 to leave this untouched.
125 config UDHCPC_SLACK_FOR_BUGGY_SERVERS
126 int "DHCP options slack buffer size"
129 depends on UDHCPD || UDHCPC
131 Some buggy DHCP servers send DHCP offer packets with option
132 field larger than we expect (which might also be considered a
133 buffer overflow attempt). These packets are normally discarded.
134 If circumstances beyond your control force you to support such
135 servers, this may help. The upper limit (924) makes dhcpc accept
136 even 1500 byte packets (maximum-sized ethernet packets).
138 This option does not make dhcp[cd] emit non-standard
141 Known buggy DHCP servers:
142 3Com OfficeConnect Remote 812 ADSL Router:
143 seems to confuse maximum allowed UDP packet size with
144 maximum size of entire IP packet, and sends packets which are
146 Seednet (ISP) VDSL: sends packets 2 bytes too large.