1 | #
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2 | # For a description of the syntax of this configuration file,
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3 | # see scripts/kbuild/config-language.txt.
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4 | #
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5 |
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6 | INSERT
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7 |
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8 | config UDHCPD
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9 | bool "udhcp server (udhcpd)"
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10 | default y
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11 | select PLATFORM_LINUX
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12 | help
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13 | udhcpd is a DHCP server geared primarily toward embedded systems,
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14 | while striving to be fully functional and RFC compliant.
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15 |
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16 | config DHCPRELAY
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17 | bool "dhcprelay"
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18 | default y
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19 | depends on UDHCPD
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20 | help
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21 | dhcprelay listens for dhcp requests on one or more interfaces
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22 | and forwards these requests to a different interface or dhcp
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23 | server.
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24 |
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25 | config DUMPLEASES
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26 | bool "Lease display utility (dumpleases)"
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27 | default y
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28 | depends on UDHCPD
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29 | help
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30 | dumpleases displays the leases written out by the udhcpd server.
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31 | Lease times are stored in the file by time remaining in lease, or
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32 | by the absolute time that it expires in seconds from epoch.
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33 |
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34 | config FEATURE_UDHCPD_WRITE_LEASES_EARLY
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35 | bool "Rewrite the lease file at every new acknowledge"
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36 | default y
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37 | depends on UDHCPD
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38 | help
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39 | If selected, udhcpd will write a new file with leases every
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40 | time a new lease has been accepted, thus eliminating the need
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41 | to send SIGUSR1 for the initial writing or updating. Any timed
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42 | rewriting remains undisturbed.
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43 |
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44 | config FEATURE_UDHCPD_BASE_IP_ON_MAC
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45 | bool "Select IP address based on client MAC"
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46 | default n
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47 | depends on UDHCPD
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48 | help
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49 | If selected, udhcpd will base its selection of IP address to offer
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50 | on the client's hardware address. Otherwise udhcpd uses the next
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51 | consecutive free address.
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52 |
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53 | This reduces the frequency of IP address changes for clients
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54 | which let their lease expire, and makes consecutive DHCPOFFERS
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55 | for the same client to (almost always) contain the same
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56 | IP address.
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57 |
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58 | config DHCPD_LEASES_FILE
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59 | string "Absolute path to lease file"
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60 | default "/var/lib/misc/udhcpd.leases"
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61 | depends on UDHCPD
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62 | help
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63 | udhcpd stores addresses in a lease file. This is the absolute path
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64 | of the file. Normally it is safe to leave it untouched.
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65 |
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66 | config UDHCPC
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67 | bool "udhcp client (udhcpc)"
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68 | default y
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69 | select PLATFORM_LINUX
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70 | help
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71 | udhcpc is a DHCP client geared primarily toward embedded systems,
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72 | while striving to be fully functional and RFC compliant.
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73 |
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74 | The udhcp client negotiates a lease with the DHCP server and
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75 | runs a script when a lease is obtained or lost.
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76 |
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77 | config FEATURE_UDHCPC_ARPING
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78 | bool "Verify that the offered address is free, using ARP ping"
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79 | default y
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80 | depends on UDHCPC
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81 | help
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82 | If selected, udhcpc will send ARP probes and make sure
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83 | the offered address is really not in use by anyone. The client
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84 | will DHCPDECLINE the offer if the address is in use,
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85 | and restart the discover process.
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86 |
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87 | config FEATURE_UDHCP_PORT
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88 | bool "Enable '-P port' option for udhcpd and udhcpc"
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89 | default n
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90 | depends on UDHCPD || UDHCPC
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91 | help
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92 | At the cost of ~300 bytes, enables -P port option.
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93 | This feature is typically not needed.
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94 |
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95 | config UDHCP_DEBUG
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96 | int "Maximum verbosity level for udhcp applets (0..9)"
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97 | default 9
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98 | range 0 9
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99 | depends on UDHCPD || UDHCPC || DHCPRELAY
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100 | help
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101 | Verbosity can be increased with multiple -v options.
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102 | This option controls how high it can be cranked up.
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103 |
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104 | Bigger values result in bigger code. Levels above 1
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105 | are very verbose and useful for debugging only.
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106 |
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107 | config FEATURE_UDHCP_RFC3397
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108 | bool "Support for RFC3397 domain search (experimental)"
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109 | default y
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110 | depends on UDHCPD || UDHCPC
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111 | help
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112 | If selected, both client and server will support passing of domain
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113 | search lists via option 119, specified in RFC 3397,
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114 | and SIP servers option 120, specified in RFC 3361.
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115 |
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116 | config FEATURE_UDHCP_8021Q
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117 | bool "Support for 802.1Q VLAN parameters"
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118 | default y
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119 | depends on UDHCPD || UDHCPC
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120 | help
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121 | If selected, both client and server will support passing of VLAN
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122 | ID and priority via options 132 and 133 as per 802.1Q.
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123 |
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124 | config UDHCPC_DEFAULT_SCRIPT
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125 | string "Absolute path to config script"
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126 | default "/usr/share/udhcpc/default.script"
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127 | depends on UDHCPC
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128 | help
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129 | This script is called after udhcpc receives an answer. See
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130 | examples/udhcp for a working example. Normally it is safe
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131 | to leave this untouched.
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132 |
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133 | config UDHCPC_SLACK_FOR_BUGGY_SERVERS
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134 | int "DHCP options slack buffer size"
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135 | default 80
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136 | range 0 924
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137 | depends on UDHCPD || UDHCPC
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138 | help
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139 | Some buggy DHCP servers send DHCP offer packets with option
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140 | field larger than we expect (which might also be considered a
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141 | buffer overflow attempt). These packets are normally discarded.
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142 | If circumstances beyond your control force you to support such
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143 | servers, this may help. The upper limit (924) makes dhcpc accept
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144 | even 1500 byte packets (maximum-sized ethernet packets).
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145 |
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146 | This option does not make dhcp[cd] emit non-standard
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147 | sized packets.
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148 |
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149 | Known buggy DHCP servers:
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150 | 3Com OfficeConnect Remote 812 ADSL Router:
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151 | seems to confuse maximum allowed UDP packet size with
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152 | maximum size of entire IP packet, and sends packets which are
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153 | 28 bytes too large.
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154 | Seednet (ISP) VDSL: sends packets 2 bytes too large.
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