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1 odhcpd - Embedded DHCP/DHCPv6/RA Server & Relay 2 3 ** Abstract ** 4 5 odhcpd is a daemon for serving and relaying IP management protocols to 6 configure clients and downstream routers. It tries to follow the RFC 6204 7 requirements for IPv6 home routers. 8 9 odhcpd provides server services for DHCP, RA, stateless and stateful DHCPv6, 10 prefix delegation and can be used to relay RA, DHCPv6 and NDP between routed 11 (non-bridged) interfaces in case no delegated prefixes are available. 12 13 14 ** Features ** 15 16 1. Router Discovery support (solicitations and advertisements) with 2 modes 17 server: RD server for slave interfaces 18 a) automatic detection of prefixes, delegated prefix and default routes, MTU 19 b) automatic reannouncement when changes to prefixes or routes occur 20 21 relay: RD relay between master and slave interfaces 22 a) support for rewriting announced DNS-server addresses in relay mode 23 24 2. DHCPv6-support with 2 modes of operation 25 server: stateless, stateful and PD-server mode 26 a) stateless and stateful address assignment 27 b) prefix delegation support 28 c) dynamic reconfiguration in case prefixes change 29 d) hostname detection and hosts-file creation 30 31 relay: mostly standards-compliant DHCPv6-relay 32 a) support for rewriting announced DNS-server addresses 33 34 3. DHCPv4-support 35 server: stateless and stateful mode 36 37 4. Proxy for Neighbor Discovery messages (solicitations and advertisements) 38 a) support for auto-learning routes to the local routing table 39 b) support for marking interfaces "external" not proxying NDP for them 40 and only serving NDP for DAD and for traffic to the router itself 41 [Warning: you should provide additional firewall rules for security] 42 43 44 ** Compiling ** 45 46 odhcpd uses cmake: 47 * To prepare a Makefile use: "cmake ." 48 * To build / install use: "make" / "make install" afterwards. 49 * To build DEB or RPM packages use: "make package" afterwards. 50 51 52 ** Configuration ** 53 54 odhcpd uses a UCI configuration file in /etc/config/dhcp for configuration 55 and may also receive information from ubus 56 57 58 Section of type odhcpd 59 60 Option Type Default Description 61 legacy bool 0 Enable DHCPv4 if start but 62 no dhcpv4 option set 63 maindhcp bool 0 Use odhcpd as the main DHCPv4 64 service 65 leasefile string DHCP/v6 lease/hostfile 66 leasetrigger string Lease trigger script 67 hostsfile string DHCP/v6 hostfile 68 loglevel integer 6 Syslog level priority (0-7) 69 70 71 Sections of type dhcp (configure DHCP / DHCPv6 / RA / NDP service) 72 73 Option Type Default Description 74 interface string <name of UCI section> logical OpenWrt interface 75 ifname string <resolved from logical> physical network interface 76 networkid string same as ifname compat. alias for ifname 77 master bool 0 is a master interface 78 for relaying 79 80 ra string disabled Router Advert service 81 [disabled|server|relay|hybrid] 82 dhcpv6 string disabled DHCPv6 service 83 [disabled|server|relay|hybrid] 84 dhcpv4 string disabled DHCPv4 service 85 [disabled|server] 86 ndp string disabled Neighbor Discovery Proxy 87 [disabled|relay|hybrid] 88 89 dynamicdhcp bool 1 Dynamically create leases 90 for DHCPv4 and DHCPv6 91 dhcpv4_forcereconf bool 0 Force reconfiguration by sending 92 force renew message even if the client 93 did not include the force renew nonce 94 capability option (RFC6704) 95 dhcpv6_assignall bool 1 Assign all viable DHCPv6 addresses 96 in statefull mode; if disabled 97 only the DHCPv6 address having the 98 longest preferred lifetime is assigned 99 dhcpv6_hostidlength integer 12 Host ID length of dynamically created leases, 100 allowed values: 12 - 64 (bits). 101 dhcpv6_na bool 1 DHCPv6 stateful addressing hands out IA_NA - 102 Internet Address - Network Address 103 dhcpv6_pd bool 1 DHCPv6 stateful addressing hands out IA_PD - 104 Internet Address - Prefix Delegation 105 dhcpv6_pd_min_len integer - Minimum prefix length to delegate with IA_PD 106 (value is adjusted if needed to be greater 107 than the interface prefix length). Range [1,62] 108 router list <local address> Routers to announce 109 accepts IPv4 only 110 dns list <local address> DNS servers to announce 111 accepts IPv4 and IPv6 112 dns_service bool 1 Announce the address of interface as DNS service 113 if the list of dns is empty 114 domain list <local search domain> Search domains to announce 115 116 leasetime string 12h DHCPv4 address leasetime 117 start integer 100 DHCPv4 pool start 118 limit integer 150 DHCPv4 pool size 119 preferred_lifetime string 7d Value for the preferred lifetime 120 for a prefix 121 ra_default integer 0 Override default route 122 0: default, 1: ignore no public address, 2: ignore all 123 ra_flags list other-config List of RA flags to be 124 advertised in RA messages 125 [managed-config other-config home-agent none] 126 ra_slaac bool 1 Announce slaac for a prefix 127 ra_offlink bool 0 Announce prefixes off-link 128 ra_preference string medium Route(r) preference 129 [medium|high|low] 130 ra_maxinterval integer 600 Maximum time allowed between 131 sending unsolicited RA 132 ra_mininterval integer 200 Minimum time allowed between 133 sending unsolicited RA 134 ra_lifetime integer 1800 Value to be placed in Router 135 Lifetime field of RA 136 ra_useleasetime bool 0 Use configured leasetime as 137 limit for the preferred and 138 valid lifetime of a prefix 139 ra_reachabletime integer 0 Reachable Time in milliseconds to be 140 advertised in RA messages 141 ra_retranstime integer 0 Retransmit Time in milliseconds to be 142 advertised in RA messages 143 ra_hoplimit integer 0 Current hoplimit to be advertised 144 in RA messages 145 ra_mtu integer - MTU to be advertised in 146 RA messages 147 ra_dns bool 1 Announce DNS configuration in 148 RA messages (RFC8106) 149 ra_pref64 string Announce PREF64 option 150 [IPv6 prefix] for NAT64 prefix (RFC8781) 151 ndproxy_routing bool 1 Learn routes from NDP 152 ndproxy_slave bool 0 NDProxy external slave 153 prefix_filter string ::/0 Only advertise on-link prefixes within 154 [IPv6 prefix] the provided IPv6 prefix; others are 155 filtered out. 156 ntp list <local address> NTP servers to announce 157 accepts IPv4 and IPv6 158 159 160 Sections of type host (static leases) 161 Option Type Default Description 162 ip string IP-Address to lease 163 mac string MAC-address 164 duid string DUID in base16 165 hostid string IPv6 host identifier 166 name string Hostname 167 leasetime string DHCPv4/v6 leasetime 168
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