| # |
| # For a description of the syntax of this configuration file, |
| # see docs/Kconfig-language.txt. |
| # |
| |
| config UDHCPD |
| bool "udhcpd (21 kb)" |
| default y |
| select PLATFORM_LINUX |
| help |
| udhcpd is a DHCP server geared primarily toward embedded systems, |
| while striving to be fully functional and RFC compliant. |
| |
| config FEATURE_UDHCPD_BASE_IP_ON_MAC |
| bool "Select IP address based on client MAC" |
| default n |
| depends on UDHCPD |
| help |
| If selected, udhcpd will base its selection of IP address to offer |
| on the client's hardware address. Otherwise udhcpd uses the next |
| consecutive free address. |
| |
| This reduces the frequency of IP address changes for clients |
| which let their lease expire, and makes consecutive DHCPOFFERS |
| for the same client to (almost always) contain the same |
| IP address. |
| |
| config FEATURE_UDHCPD_WRITE_LEASES_EARLY |
| bool "Rewrite lease file at every new acknowledge" |
| default y |
| depends on UDHCPD |
| help |
| If selected, udhcpd will write a new file with leases every |
| time a new lease has been accepted, thus eliminating the need |
| to send SIGUSR1 for the initial writing or updating. Any timed |
| rewriting remains undisturbed. |
| |
| config DHCPD_LEASES_FILE |
| string "Absolute path to lease file" |
| default "/var/lib/misc/udhcpd.leases" |
| depends on UDHCPD |
| help |
| udhcpd stores addresses in a lease file. This is the absolute path |
| of the file. Normally it is safe to leave it untouched. |
| |
| config DUMPLEASES |
| bool "dumpleases (5.1 kb)" |
| default y |
| help |
| dumpleases displays the leases written out by the udhcpd. |
| Lease times are stored in the file by time remaining in lease, or |
| by the absolute time that it expires in seconds from epoch. |
| |
| config DHCPRELAY |
| bool "dhcprelay (5.2 kb)" |
| default y |
| help |
| dhcprelay listens for DHCP requests on one or more interfaces |
| and forwards these requests to a different interface or DHCP |
| server. |
| |
| config UDHCPC |
| bool "udhcpc (24 kb)" |
| default y |
| select PLATFORM_LINUX |
| help |
| udhcpc is a DHCP client geared primarily toward embedded systems, |
| while striving to be fully functional and RFC compliant. |
| |
| The udhcp client negotiates a lease with the DHCP server and |
| runs a script when a lease is obtained or lost. |
| |
| config FEATURE_UDHCPC_ARPING |
| bool "Verify that the offered address is free, using ARP ping" |
| default y |
| depends on UDHCPC |
| help |
| If selected, udhcpc will send ARP probes and make sure |
| the offered address is really not in use by anyone. The client |
| will DHCPDECLINE the offer if the address is in use, |
| and restart the discover process. |
| |
| config FEATURE_UDHCPC_SANITIZEOPT |
| bool "Do not pass malformed host and domain names" |
| default y |
| depends on UDHCPC |
| help |
| If selected, udhcpc will check some options (such as option 12 - |
| hostname) and if they don't look like valid hostnames |
| (for example, if they start with dash or contain spaces), |
| they will be replaced with string "bad" when exporting |
| to the environment. |
| |
| config UDHCPC_DEFAULT_SCRIPT |
| string "Absolute path to config script" |
| default "/usr/share/udhcpc/default.script" |
| depends on UDHCPC || UDHCPC6 |
| help |
| This script is called after udhcpc receives an answer. See |
| examples/udhcp for a working example. Normally it is safe |
| to leave this untouched. |
| |
| # udhcpc6 config is inserted here: |
| INSERT |
| |
| comment "Common options for DHCP applets" |
| depends on UDHCPD || UDHCPC || UDHCPC6 || DHCPRELAY |
| |
| config FEATURE_UDHCP_PORT |
| bool "Enable '-P port' option for udhcpd and udhcpc" |
| default n |
| depends on UDHCPD || UDHCPC || UDHCPC6 |
| help |
| At the cost of ~300 bytes, enables -P port option. |
| This feature is typically not needed. |
| |
| config UDHCP_DEBUG |
| int "Maximum verbosity level (0..9)" |
| default 2 |
| range 0 9 |
| depends on UDHCPD || UDHCPC || UDHCPC6 || DHCPRELAY |
| help |
| Verbosity can be increased with multiple -v options. |
| This option controls how high it can be cranked up. |
| |
| Bigger values result in bigger code. Levels above 1 |
| are very verbose and useful for debugging only. |
| |
| config UDHCPC_SLACK_FOR_BUGGY_SERVERS |
| int "DHCP options slack buffer size" |
| default 80 |
| range 0 924 |
| depends on UDHCPD || UDHCPC |
| help |
| Some buggy DHCP servers send DHCP offer packets with option |
| field larger than we expect (which might also be considered a |
| buffer overflow attempt). These packets are normally discarded. |
| If circumstances beyond your control force you to support such |
| servers, this may help. The upper limit (924) makes udhcpc accept |
| even 1500 byte packets (maximum-sized ethernet packets). |
| |
| This option does not make udhcp[cd] emit non-standard |
| sized packets. |
| |
| Known buggy DHCP servers: |
| 3Com OfficeConnect Remote 812 ADSL Router: |
| seems to confuse maximum allowed UDP packet size with |
| maximum size of entire IP packet, and sends packets |
| which are 28 bytes too large. |
| Seednet (ISP) VDSL: sends packets 2 bytes too large. |
| |
| config FEATURE_UDHCP_RFC3397 |
| bool "Support RFC 3397 domain search options" |
| default y |
| depends on UDHCPD || UDHCPC |
| help |
| If selected, both client and server will support passing of domain |
| search lists via option 119, specified in RFC 3397, |
| and SIP servers option 120, specified in RFC 3361. |
| |
| config FEATURE_UDHCP_8021Q |
| bool "Support 802.1Q VLAN parameters options" |
| default y |
| depends on UDHCPD || UDHCPC |
| help |
| If selected, both client and server will support passing of VLAN |
| ID and priority via options 132 and 133 as per 802.1Q. |
