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https://github.com/openwrt/odhcpd

This repository is a mirror of https://git.openwrt.org/?p=project/odhcpd.git. Pull requests will be accepted which will be merged in odhcpd.git
https://github.com/openwrt/odhcpd

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This repository is a mirror of https://git.openwrt.org/?p=project/odhcpd.git. Pull requests will be accepted which will be merged in odhcpd.git

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odhcpd - Embedded DHCP/DHCPv6/RA Server & Relay



** Abstract **



odhcpd is a daemon for serving and relaying IP management protocols to

configure clients and downstream routers. It tries to follow the RFC 6204

requirements for IPv6 home routers.



odhcpd provides server services for DHCP, RA, stateless and stateful DHCPv6,

prefix delegation and can be used to relay RA, DHCPv6 and NDP between routed

(non-bridged) interfaces in case no delegated prefixes are available.



** Features **



1. Router Discovery support (solicitations and advertisements) with 2 modes

   server:	RD server for slave interfaces

   a) automatic detection of prefixes, delegated prefix and default routes, MTU

   b) automatic reannouncement when changes to prefixes or routes occur



   relay:	RD relay between master and slave interfaces

   a) support for rewriting announced DNS-server addresses in relay mode

   

2. DHCPv6-support with 2 modes of operation

   server: stateless, stateful and PD-server mode

   a) stateless and stateful address assignment

   b) prefix delegation support

   c) dynamic reconfiguration in case prefixes change

   d) hostname detection and hosts-file creation



   relay: 	mostly standards-compliant DHCPv6-relay

   a) support for rewriting announced DNS-server addresses

   

3. DHCPv4-support

   server: stateless and stateful mode



4. Proxy for Neighbor Discovery messages (solicitations and advertisements)

   a) support for auto-learning routes to the local routing table

   b) support for marking interfaces "external" not proxying NDP for them

      and only serving NDP for DAD and for traffic to the router itself

      [Warning: you should provide additional firewall rules for security]



** Compiling **



odhcpd uses cmake:

* To prepare a Makefile use:  "cmake ." 

* To build / install use: "make" / "make install" afterwards.

* To build DEB or RPM packages use: "make package" afterwards.



** Configuration **



odhcpd uses a UCI configuration file in /etc/config/dhcp for configuration

and may also receive information from ubus



Section of type odhcpd



Option		Type	Default			Description

legacy		bool	0			Enable DHCPv4 if start but

						no dhcpv4 option set

maindhcp	bool	0			Use odhcpd as the main DHCPv4

						service

leasefile	string				DHCP/v6 lease/hostfile

leasetrigger	string				Lease trigger script

hostsfile	string				DHCP/v6 hostfile

loglevel	integer 6			Syslog level priority (0-7)



Sections of type dhcp (configure DHCP / DHCPv6 / RA / NDP service)



Option			Type	Default			Description

interface		string		logical OpenWrt interface

ifname			string		physical network interface

networkid		string	same as ifname		compat. alias for ifname

master			bool	0			is a master interface

							for relaying



ra			string	disabled		Router Advert service

			[disabled|server|relay|hybrid]

dhcpv6			string	disabled		DHCPv6 service

			[disabled|server|relay|hybrid]

dhcpv4			string	disabled		DHCPv4 service

			[disabled|server]

ndp			string	disabled		Neighbor Discovery Proxy

			[disabled|relay|hybrid]



dynamicdhcp		bool	1			Dynamically create leases

							for DHCPv4 and DHCPv6

dhcpv4_forcereconf	bool	0			Force reconfiguration by sending

							force renew message even if the client

							did not include the force renew nonce

							capability option (RFC6704)

dhcpv6_assignall	bool	1			Assign all viable DHCPv6 addresses

							in statefull mode; if disabled

							only the DHCPv6 address having the

							longest preferred lifetime is assigned

dhcpv6_hostidlength	integer 12			Host ID length of dynamically created leases,

							allowed values: 12 - 64 (bits).

dhcpv6_na		bool	1			DHCPv6 stateful addressing hands out IA_NA -

								Internet Address - Network Address

dhcpv6_pd		bool	1			DHCPv6 stateful addressing hands out IA_PD -

								Internet Address - Prefix Delegation

dhcpv6_pd_min_len	integer	-			Minimum prefix length to delegate with IA_PD

							(value is adjusted if needed to be greater

							than the interface prefix length).  Range [1,62]

router			list    		Routers to announce

							accepts IPv4 only

dns			list			DNS servers to announce

							accepts IPv4 and IPv6

dns_service		bool	1			Announce the address of interface as DNS service

							if the list of dns is empty

domain			list		Search domains to announce



leasetime		string	12h			DHCPv4 address leasetime

start			integer	100			DHCPv4 pool start

limit			integer	150			DHCPv4 pool size

preferred_lifetime	string	7d			Value for the preferred lifetime

							for a prefix

ra_default		integer	0			Override default route

			0: default, 1: ignore no public address, 2: ignore all

ra_flags		list	other-config		List of RA flags to be

							advertised in RA messages

			[managed-config other-config home-agent none]

ra_slaac		bool	1			Announce slaac for a prefix

ra_offlink		bool	0			Announce prefixes off-link

ra_preference		string	medium			Route(r) preference

			[medium|high|low]

ra_maxinterval		integer	600			Maximum time allowed between

							sending unsolicited RA

ra_mininterval		integer	200			Minimum time allowed between

							sending unsolicited RA

ra_lifetime		integer	1800			Value to be placed in Router

							Lifetime field of RA

ra_useleasetime		bool	0			Use configured leasetime as

							limit for the preferred and

							valid lifetime of a prefix

ra_reachabletime	integer	0			Reachable Time in milliseconds to be

							advertised in RA messages

ra_retranstime		integer	0			Retransmit Time in milliseconds to be

							advertised in RA messages

ra_hoplimit		integer	0			Current hoplimit to be advertised

							in RA messages

ra_mtu			integer -			MTU to be advertised in

							RA messages

ra_dns			bool	1			Announce DNS configuration in

							RA messages (RFC8106)

ra_pref64		string				Announce PREF64 option

			[IPv6 prefix]			for NAT64 prefix (RFC8781)

ndproxy_routing		bool	1			Learn routes from NDP

ndproxy_slave		bool	0			NDProxy external slave

prefix_filter		string	::/0			Only advertise on-link prefixes within

			[IPv6 prefix]			the provided IPv6 prefix; others are

							filtered out.

ntp			list			NTP servers to announce

							accepts IPv4 and IPv6



Sections of type host (static leases)

Option		Type	Default			Description

ip		string				IP-Address to lease

mac		string				MAC-address

duid		string				DUID in base16

hostid		string				IPv6 host identifier

name		string				Hostname

leasetime	string				DHCPv4/v6 leasetime