2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
7 bool "udhcp server (udhcpd)"
10 udhcpd is a DHCP server geared primarily toward embedded systems,
11 while striving to be fully functional and RFC compliant.
18 dhcprelay listens for dhcp requests on one or more interfaces
19 and forwards these requests to a different interface or dhcp
23 bool "Lease display utility (dumpleases)"
27 dumpleases displays the leases written out by the udhcpd server.
28 Lease times are stored in the file by time remaining in lease, or
29 by the absolute time that it expires in seconds from epoch.
31 config FEATURE_UDHCPD_WRITE_LEASES_EARLY
32 bool "Rewrite the lease file at every new acknowledge"
36 If selected, udhcpd will write a new file with leases every
37 time a new lease has been accepted, thus eliminating the need
38 to send SIGUSR1 for the initial writing or updating. Any timed
39 rewriting remains undisturbed
41 config DHCPD_LEASES_FILE
42 string "Absolute path to lease file"
43 default "/var/lib/misc/udhcpd.leases"
46 udhcpd stores addresses in a lease file. This is the absolute path
47 of the file. Normally it is safe to leave it untouched.
50 bool "udhcp client (udhcpc)"
53 udhcpc is a DHCP client geared primarily toward embedded systems,
54 while striving to be fully functional and RFC compliant.
56 The udhcp client negotiates a lease with the DHCP server and
57 runs a script when a lease is obtained or lost.
59 config FEATURE_UDHCPC_ARPING
60 bool "Verify that the offered address is free, using ARP ping"
64 If selected, udhcpc will send ARP probes and make sure
65 the offered address is really not in use by anyone. The client
66 will DHCPDECLINE the offer if the address is in use,
67 and restart the discover process.
69 config FEATURE_UDHCP_PORT
70 bool "Enable '-P port' option for udhcpd and udhcpc"
72 depends on APP_UDHCPD || APP_UDHCPC
74 At the cost of ~300 bytes, enables -P port option.
75 This feature is typically not needed.
78 bool "Compile udhcp with noisy debugging messages"
80 depends on APP_UDHCPD || APP_UDHCPC
82 If selected, udhcpd will output extra debugging output.
84 config FEATURE_UDHCP_RFC3397
85 bool "Support for RFC3397 domain search (experimental)"
87 depends on APP_UDHCPD || APP_UDHCPC
89 If selected, both client and server will support passing of domain
90 search lists via option 119, specified in RFC3397.
92 config UDHCPC_DEFAULT_SCRIPT
93 string "Absolute path to config script"
94 default "/usr/share/udhcpc/default.script"
97 This script is called after udhcpc receives an answer. See
98 examples/udhcp for a working example. Normally it is safe
99 to leave this untouched.
101 config UDHCPC_SLACK_FOR_BUGGY_SERVERS
102 int "DHCP options slack buffer size"
105 depends on APP_UDHCPD || APP_UDHCPC
107 Some buggy DHCP servers send DHCP offer packets with option
108 field larger than we expect (which might also be considered a
109 buffer overflow attempt). These packets are normally discarded.
110 If circumstances beyond your control force you to support such
111 servers, this may help. The upper limit (924) makes dhcpc accept
112 even 1500 byte packets (maximum-sized ethernet packets).
114 This option does not make dhcp[cd] emit non-standard
117 Known buggy DHCP servers:
118 3Com OfficeConnect Remote 812 ADSL Router:
119 seems to confuse maximum allowed UDP packet size with
120 maximum size of entire IP packet, and sends packets which are
122 Seednet (ISP) VDSL: sends packets 2 bytes too large.