2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
9 bool "udhcp server (udhcpd)"
12 udhcpd is a DHCP server geared primarily toward embedded systems,
13 while striving to be fully functional and RFC compliant.
20 dhcprelay listens for dhcp requests on one or more interfaces
21 and forwards these requests to a different interface or dhcp
25 bool "Lease display utility (dumpleases)"
29 dumpleases displays the leases written out by the udhcpd server.
30 Lease times are stored in the file by time remaining in lease, or
31 by the absolute time that it expires in seconds from epoch.
33 config FEATURE_UDHCPD_WRITE_LEASES_EARLY
34 bool "Rewrite the lease file at every new acknowledge"
38 If selected, udhcpd will write a new file with leases every
39 time a new lease has been accepted, thus eliminating the need
40 to send SIGUSR1 for the initial writing or updating. Any timed
41 rewriting remains undisturbed
43 config DHCPD_LEASES_FILE
44 string "Absolute path to lease file"
45 default "/var/lib/misc/udhcpd.leases"
48 udhcpd stores addresses in a lease file. This is the absolute path
49 of the file. Normally it is safe to leave it untouched.
52 bool "udhcp client (udhcpc)"
55 udhcpc is a DHCP client geared primarily toward embedded systems,
56 while striving to be fully functional and RFC compliant.
58 The udhcp client negotiates a lease with the DHCP server and
59 runs a script when a lease is obtained or lost.
61 config FEATURE_UDHCPC_ARPING
62 bool "Verify that the offered address is free, using ARP ping"
66 If selected, udhcpc will send ARP probes and make sure
67 the offered address is really not in use by anyone. The client
68 will DHCPDECLINE the offer if the address is in use,
69 and restart the discover process.
71 config FEATURE_UDHCP_PORT
72 bool "Enable '-P port' option for udhcpd and udhcpc"
74 depends on UDHCPD || UDHCPC
76 At the cost of ~300 bytes, enables -P port option.
77 This feature is typically not needed.
80 int "Maximum verbosity level for udhcp applets (0..9)"
83 depends on UDHCPD || UDHCPC || DHCPRELAY
85 Verbosity can be increased with multiple -v options.
86 This options controls how high it can be cranked up.
88 Bigger values result in bigger code. Levels above 1
89 are very verbose and useful for debugging only.
91 config FEATURE_UDHCP_RFC3397
92 bool "Support for RFC3397 domain search (experimental)"
94 depends on UDHCPD || UDHCPC
96 If selected, both client and server will support passing of domain
97 search lists via option 119, specified in RFC 3397,
98 and SIP servers option 120, specified in RFC 3361.
100 config UDHCPC_DEFAULT_SCRIPT
101 string "Absolute path to config script"
102 default "/usr/share/udhcpc/default.script"
105 This script is called after udhcpc receives an answer. See
106 examples/udhcp for a working example. Normally it is safe
107 to leave this untouched.
109 config UDHCPC_SLACK_FOR_BUGGY_SERVERS
110 int "DHCP options slack buffer size"
113 depends on UDHCPD || UDHCPC
115 Some buggy DHCP servers send DHCP offer packets with option
116 field larger than we expect (which might also be considered a
117 buffer overflow attempt). These packets are normally discarded.
118 If circumstances beyond your control force you to support such
119 servers, this may help. The upper limit (924) makes dhcpc accept
120 even 1500 byte packets (maximum-sized ethernet packets).
122 This option does not make dhcp[cd] emit non-standard
125 Known buggy DHCP servers:
126 3Com OfficeConnect Remote 812 ADSL Router:
127 seems to confuse maximum allowed UDP packet size with
128 maximum size of entire IP packet, and sends packets which are
130 Seednet (ISP) VDSL: sends packets 2 bytes too large.