Dynamic Host Configuration Protocol

The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on TCP/IP networks whereby a DHCP server dynamically assigns an IP address and other network configuration parameters to each device on a network so they can communicate with other IP networks.

A DHCP server enables computers to request IP addresses and networking parameters automatically from the Internet service provider (ISP), reducing the need for a network administrator or a user to manually assign IP addresses to all network devices.

In the absence of a DHCP server, a computer or other device on the network needs to be manually assigned an IP address.

DHCP can be implemented on networks ranging in size from home networks to large campus networks and regional Internet service provider networks. 

A router or a residential gateway can be enabled to act as a DHCP server. Most residential network routers receive a globally unique IP address within the ISP network. Within a local network, a DHCP server assigns a local IP address to each device connected to the network.

Overview

TCP/IP defines how devices on one network communicate with devices on another network, and the DHCP server can manage TCP/IP settings for devices on a network, by automatically or dynamically assigning IP addresses to the devices.

The DHCP operates based on the client–server model. When a computer or other device connects to a network, the DHCP client software sends a DHCP broadcast query requesting the necessary information. Any DHCP server on the network may service the request.

The DHCP server manages a pool of IP addresses and information about client configuration parameters such as default gateway, domain name, the name servers, and time servers. On receiving a DHCP request, the DHCP server may respond with specific information for each client, as previously configured by an administrator, or with a specific address and any other information valid for the entire network and for the time period for which the allocation (lease) is valid.

A DHCP client typically queries for this information immediately after booting, and periodically thereafter before the expiration of the information. When a DHCP client refreshes an assignment, it initially requests the same parameter values, but the DHCP server may assign a new address based on the assignment policies set by administrators.

On large networks that consist of multiple links, a single DHCP server may service the entire network when aided by DHCP relay agents located on the interconnecting routers. Such agents relay messages between DHCP clients and DHCP servers located on different subnets.

Depending on implementation, the DHCP server may have three methods of allocating IP addresses:

Dynamic allocation
A network administrator reserves a range of IP addresses for DHCP, and each DHCP client on the LAN is configured to request an IP address from the DHCP server during network initialization. The request-and-grant process uses a lease concept with a controllable time period, allowing the DHCP server to reclaim and then reallocate IP addresses that are not renewed.
Automatic allocation
The DHCP server permanently assigns an IP address to a requesting client from the range defined by the administrator. This is like dynamic allocation, but the DHCP server keeps a table of past IP address assignments, so that it can preferentially assign to a client the same IP address that the client previously had.
Manual allocation (commonly called static allocation)
The DHCP server issues a private IP address dependent upon each client’s MAC address, based on a predefined mapping by the administrator.
This feature is variously called static DHCP assignment by DD-WRT, fixed-address by the dhcpd documentation, address reservation by Netgear, DHCP reservation or static DHCP by Cisco and Linksys, and IP address reservation or MAC/IP address binding by various other router manufacturers. If no match for the client’s MAC address is found, the server may or may not optionally fall back to either Dynamic or Automatic allocation.

DHCP is used for Internet Protocol version 4 (IPv4) and IPv6. While both versions serve the same purpose, the details of the protocol for IPv4 and IPv6 differ sufficiently that they may be considered separate protocols.

For the IPv6 operation, devices may alternatively use stateless address autoconfiguration. IPv6 hosts may also use link-local addressing to achieve operations restricted to the local network link.

Operation

The DHCP employs a connectionless service model, using the User Datagram Protocol (UDP). It is implemented with two UDP port numbers for its operations which are the same as for the BOOTP protocol.

UDP port number 67 is the destination port of a server, and UDP port number 68 is used by the client.

DHCP operations fall into four phases: server discovery, IP lease offer, IP lease request, and IP lease acknowledgement.

These stages are often abbreviated as DORA for discovery, offer, request, and acknowledgement.

The DHCP operation begins with clients broadcasting a request. If the client and server are on different subnets, a DHCP Helper or DHCP Relay Agent may be used.

Clients requesting renewal of an existing lease may communicate directly via UDP unicast, since the client already has an established IP address at that point. Additionally, there is a BOOTP flag the client can use to indicate in which way (broadcast or unicast) it can receive the DHCPOFFER: 0x8000 for broadcast, 0x0000 for unicast.

Only hosts with preconfigured IP addresses can receive unicast packets so in the usual use case clients in discovery phase should set BOOTP flag to 0x8000 (broadcast).

DHCP discovery

The DHCP client broadcasts a DHCPDISCOVER message on the network subnet using the destination address 255.255.255.255 or the specific subnet broadcast address.

A DHCP client may also request its last-known IP address. If the client remains connected to the same network, the server may grant the request. Otherwise, it depends whether the server is set up as authoritative or not. An authoritative server denies the request, causing the client to issue a new request.

A non-authoritative server simply ignores the request, leading to an implementation-dependent timeout for the client to expire the request and ask for a new IP address.

For example, if HTYPE is set to 1, to specify that the medium used is ethernet, HLEN is set to 6 because an ethernet address (MAC address) is 6 octets long. The CHADDR is set to the MAC address used by the client. Some options are set as well.

Example DHCPDISCOVER message
IP: source=0.0.0.0; destination=255.255.255.255
UDP: source port=68; destination port=67
Octet 0 Octet 1 Octet 2 Octet 3
OP HTYPE HLEN HOPS
0x01 0x01 0x06 0x00
XID
0x3903F326
SECS FLAGS
0x0000 0x8000
CIADDR (Client IP address)
0x00000000
YIADDR (Your IP address)
0x00000000
SIADDR (Server IP address)
0x00000000
GIADDR (Gateway IP address)
0x00000000
CHADDR (Client hardware address)
0x00053C04
0x8D590000
0x00000000
0x00000000
192 octets of 0s, or overflow space for additional options; BOOTP legacy.
Magic cookie
0x63825363
DHCP options
0x350101 53: 1 (DHCP Discover)
0x3204c0a00164 50: 192.168.1.100 requested
0x370401030f06 55 (Parameter Request List):

  • 1 (Request Subnet Mask),
  • 3 (Router),
  • 15 (Domain Name),
  • 6 (Domain Name Server)
0xff 255 (Endmark)

DHCP offer

When a DHCP server receives a DHCPDISCOVER message from a client, which is an IP address lease request, the DHCP server reserves an IP address for the client and makes a lease offer by sending a DHCPOFFER message to the client.

This message contains the client’s MAC address, the IP address that the server is offering, the subnet mask, the lease duration, and the IP address of the DHCP server making the offer.

The DHCP server determines the configuration based on the client’s hardware address as specified in the CHADDR (client hardware address) field. Here the server, 192.168.1.1, specifies the client’s IP address in the YIADDR (your IP address) field.

DHCPOFFER message
IP: source=192.168.1.1; destination=255.255.255.255
UDP: source port=67; destination port=68
Octet 0 Octet 1 Octet 2 Octet 3
OP HTYPE HLEN HOPS
0x02 0x01 0x06 0x00
XID
0x3903F326
SECS FLAGS
0x0000 0x8000
CIADDR (Client IP address)
0x00000000
YIADDR (Your IP address)
0xC0A80164 (192.168.1.100)
SIADDR (Server IP address)
0xC0A80101 (192.168.1.1)
GIADDR (Gateway IP address)
0x00000000
CHADDR (Client hardware address)
0x00053C04
0x8D590000
0x00000000
0x00000000
192 octets of 0s; BOOTP legacy.
Magic cookie
0x63825363
DHCP options
53: 2 (DHCP Offer)
1 (subnet mask): 255.255.255.0
3 (Router): 192.168.1.1
51 (IP address lease time): 86400s (1 day)
54 (DHCP server): 192.168.1.1
6 (DNS servers):

  • 9.7.10.15,
  • 9.7.10.16,
  • 9.7.10.18

DHCP request

In response to the DHCP offer, the client replies with a DHCPREQUEST message, broadcast to the server,requesting the offered address.

A client can receive DHCP offers from multiple servers, but it will accept only one DHCP offer. Based on required server identification option in the request and broadcast messaging, servers are informed whose offer the client has accepted.

When other DHCP servers receive this message, they withdraw any offers that they have made to the client and return the offered IP address to the pool of available addresses.

DHCPREQUEST message
IP: source=0.0.0.0 destination=255.255.255.255;
UDP: source port=68; destination port=67
Octet 0 Octet 1 Octet 2 Octet 3
OP HTYPE HLEN HOPS
0x01 0x01 0x06 0x00
XID
0x3903F326
SECS FLAGS
0x0000 0x8000
CIADDR (Client IP address)
0x00000000
YIADDR (Your IP address)
0x00000000
SIADDR (Server IP address)
0xC0A80101
GIADDR (Gateway IP address)
0x00000000
CHADDR (Client hardware address)
0x00053C04
0x8D590000
0x00000000
0x00000000
192 octets of 0s; BOOTP legacy.
Magic cookie
0x63825363
DHCP options
53: 3 (DHCP Request)
50: 192.168.1.100 requested
54 (DHCP server): 192.168.1.1

DHCP acknowledgement

When the DHCP server receives the DHCPREQUEST message from the client, the configuration process enters its final phase. The acknowledgement phase involves sending a DHCPACK packet to the client. This packet includes the lease duration and any other configuration information that the client might have requested. At this point, the IP configuration process is completed.

The protocol expects the DHCP client to configure its network interface with the negotiated parameters.

After the client obtains an IP address, it should probe the newly received address (e.g. with ARP Address Resolution Protocol) to prevent address conflicts caused by overlapping address pools of DHCP servers.

DHCPACK message
IP: source=192.168.1.1; destination=255.255.255.255
UDP: source port=67; destination port=68
Octet 0 Octet 1 Octet 2 Octet 3
OP HTYPE HLEN HOPS
0x02 0x01 0x06 0x00
XID
0x3903F326
SECS FLAGS
0x0000 0x8000
CIADDR (Client IP address)
0x00000000
YIADDR (Your IP address)
0xC0A80164
SIADDR (Server IP address)
0xC0A80101
GIADDR (Gateway IP address switched by relay)
0x00000000
CHADDR (Client hardware address)
0x00053C04
0x8D590000
0x00000000
0x00000000
192 octets of 0s. BOOTP legacy
Magic cookie
0x63825363
DHCP options
53: 5 (DHCP ACK) or 6 (DHCP NAK)
1 (subnet mask): 255.255.255.0
3 (Router): 192.168.1.1
51 (IP address lease time): 86400s (1 day)
54 (DHCP server): 192.168.1.1
6 (DNS servers):

  • 9.7.10.15,
  • 9.7.10.16,
  • 9.7.10.18

DHCP information

A DHCP client may request more information than the server sent with the original DHCPOFFER. The client may also request repeat data for a particular application. For example, browsers use DHCP Inform to obtain web proxy settings via WPAD.

DHCP releasing

The client sends a request to the DHCP server to release the DHCP information and the client deactivates its IP address. As client devices usually do not know when users may unplug them from the network, the protocol does not mandate the sending of DHCP Release.

Client configuration parameters

A DHCP server can provide optional configuration parameters to the client. RFC 2132 describes the available DHCP options defined by Internet Assigned Numbers Authority (IANA) – DHCP and BOOTP PARAMETERS.

A DHCP client can select, manipulate and overwrite parameters provided by a DHCP server.

DHCP options

Options are octet strings of varying length. The first octet is the option code, the second octet is the number of following octets and the remaining octets are code dependent. For example, the DHCP Message type option for an Offer would appear as 0x35, 0x01, 0x02, where 0x35 is code 53 for “DHCP Message Type”, 0x01 means one octet follows and 0x02 is the value of “Offer”.

Documented in RFC 2132

The following tables list the available DHCP options, as listed in RFC 2132.

RFC 1497 (BOOTP Vendor Information Extensions) vendor extensions
Code Name Length Notes
0 Pad[11]:Section 3.1 0 octets Can be used to pad other options so that they are aligned to the word boundary; is not followed by length byte
1 Subnet Mask
4 octets Must be sent after the router option (option 3) if both are included
2 Time Offset 4 octets
3 Router Multiples of 4 octets Available routers, should be listed in order of preference
4 Time Server Multiples of 4 octets Available time servers to synchronise with, should be listed in order of preference
5 Name Server Multiples of 4 octets Available IEN 116 name servers, should be listed in order of preference
6 Domain Name Server Multiples of 4 octets Available DNS servers, should be listed in order of preference
7 Log Server Multiples of 4 octets Available log servers, should be listed in order of preference.
8 Cookie Server Multiples of 4 octets “Cookie” in this case means “fortune cookie” or “quote of the day,” a pithy or humorous anecdote often sent as part of a logon process on large computers; it has nothing to do with cookies sent by websites.
9 LPR Server Multiples of 4 octets
10 Impress Server Multiples of 4 octets
11 Resource Location Server Multiples of 4 octets
12 Host Name Minimum of 1 octet
13 Boot File Size 2 octets Length of the boot image in 4KiB blocks
14 Merit Dump File Minimum of 1 octet Path where crash dumps should be stored
15 Domain Name Minimum of 1 octet
16 Swap Server 4 octets
17 Root Path Minimum of 1 octet
18 Extensions Path Minimum of 1 octet
255 End 0 octets Used to mark the end of the vendor option field
IP Layer Parameters per Host
Code Name Length Notes
19 IP Forwarding Enable/Disable 1 octet
20 Non-Local Source Routing Enable/Disable 1 octet
21 Policy Filter Multiples of 8 octets
22 Maximum Datagram Reassembly Size 2 octets
23 Default IP Time-to-live 1 octet
24 Path MTU Aging Timeout 4 octets
25 Path MTU Plateau Table Multiples of 2 octets
IP Layer Parameters per Interface
Code Name Length Notes
26 Interface MTU 2 octets
27 All Subnets are Local 1 octet
28 Broadcast Address 4 octets
29 Perform Mask Discovery 1 octet
30 Mask Supplier 1 octet
31 Perform Router Discovery 1 octet
32 Router Solicitation Address 4 octets
33 Static Route Multiples of 8 octets A list of destination/router pairs
Link Layer Parameters per Interface
Code Name Length Notes
34 Trailer Encapsulation Option 1 octet
35 ARP Cache Timeout 4 octets
36 Ethernet Encapsulation 1 octet
TCP Parameters[11]:Section 7
Code Name Length Notes
37 TCP Default TTL 1 octet
38 TCP Keepalive Interval 4 octets
39 TCP Keepalive Garbage 1 octet
Application and Service Parameters
Code Name Length Notes
40 Network Information Service Domain Minimum of 1 octet
41 Network Information Servers Multiples of 4 octets
42 Network Time Protocol Servers Multiples of 4 octets
43 Vendor Specific Information Minimum of 1 octets
44 NetBIOS over TCP/IP Name Server Multiples of 4 octets
45 NetBIOS over TCP/IP Datagram Distribution Server Multiples of 4 octets
46 NetBIOS over TCP/IP Node Type 1 octet
47 NetBIOS over TCP/IP Scope Minimum of 1 octet
48 X Window System Font Server Multiples of 4 octets
49 X Window System Display Manager Multiples of 4 octets
64 Network Information Service+ Domain Minimum of 1 octet
65 Network Information Service+ Servers Multiples of 4 octets
68 Mobile IP Home Agent Multiples of 4 octets
69 Simple Mail Transport Protocol (SMTP) Server Multiples of 4 octets
70 Post Office Protocol (POP3) Server Multiples of 4 octets
71 Network News Transport Protocol (NNTP) Server Multiples of 4 octets
72 Default World Wide Web (WWW) Server Multiples of 4 octets
73 Default Finger Server Multiples of 4 octets
74 Default Internet Relay Chat (IRC) Server Multiples of 4 octets
75 StreetTalk Server Multiples of 4 octets
76 StreetTalk Directory Assistance (STDA) Server Multiples of 4 octets
DHCP Extensions
Code Name Length Notes
50 Requested IP address 4 octets
51 IP address Lease Time 4 octets
52 Option Overload 1 octet
53 DHCP Message Type 1 octet
54 Server Identifier 4 octets
55 Parameter Request List Minimum of 1 octet
56 Message Minimum of 1 octet
57 Maximum DHCP Message Size 2 octets
58 Renewal (T1) Time Value 4 octets
59 Rebinding (T2) Time Value 4 octets
60 Vendor class identifier Minimum of 1 octet
61 Client-identifier Minimum of 2 octets
66 TFTP server name Minimum of 1 octet
67 Bootfile name Minimum of 1 octet

DHCP client vendor identification

An option exists to identify the vendor and functionality of a DHCP client.

The information is a variable-length string of characters or octets which has a meaning specified by the vendor of the DHCP client. One method that a DHCP client can utilize to communicate to the server that it is using a certain type of hardware or firmware is to set a value in its DHCP requests called the Vendor Class Identifier (VCI) (Option 60).

This method allows a DHCP server to differentiate between the two kinds of client machines and process the requests from the two types of modems appropriately.

Some types of set-top boxes also set the VCI (Option 60) to inform the DHCP server about the hardware type and functionality of the device. The value this option is set to gives the DHCP server a hint about any required extra information that this client needs in a DHCP response.

Documented Elsewhere

Documented DHCP Options
Code Name Length RFC
82 Relay Agent Information Option Minimum of 2 octets RFC 3046
85 NDS Servers Option Minimum of 4 octets, multiple of 4 octets RFC 2241
86 NDS Tree Name Option Variable RFC 2241
87 NDS Context Option Variable RFC 2241
119 Domain Search Option Variable RFC 3397
121 Classless Static Route Option Variable RFC 3442

Relay Agent Information Sub-options

The Relay Agent Information Option (option 82)specifies container for attaching sub-options to DHCP requests transmitted between a DHCP relay and a DHCP server.

Relay Agent Sub-options
Code Name Length RFC
4 DOCSIS (Data-Over-Cable Service Interface Specifications) Device Class 4 octets RFC 3256

DHCP relaying

In small networks, where only one IP subnet is being managed, DHCP clients communicate directly with DHCP servers.

However, DHCP servers can also provide IP addresses for multiple subnets. In this case, a DHCP client that has not yet acquired an IP address cannot communicate directly with the DHCP server using IP routing, because it doesn’t have a routable IP address, doesn’t know the IP address of a router, and doesn’t know the IP address of the DHCP server.

In order to allow DHCP clients on subnets not directly served by DHCP servers to communicate with DHCP servers, DHCP relay agents can be installed on these subnets.

The DHCP client broadcasts on the local link; the relay agent receives the broadcast and transmits it to one or more DHCP servers using unicast. The relay agent stores its own IP address in the GIADDR field of the DHCP packet.

The DHCP server uses the GIADDR value to determine the subnet on which the relay agent received the broadcast, and allocates an IP address on that subnet. When the DHCP server replies to the client, it sends the reply to the GIADDR address, again using unicast. The relay agent then retransmits the response on the local network.

In this situation, the communication between the relay agent and the DHCP server typically uses both a source and destination UDP port of 67.

Reliability

The DHCP ensures reliability in several ways: periodic renewal, rebinding,and failover. DHCP clients are allocated leases that last for some period of time. Clients begin to attempt to renew their leases once half the lease interval has expired.

They do this by sending a unicast DHCPREQUEST message to the DHCP server that granted the original lease. If that server is down or unreachable, it will fail to respond to the DHCPREQUEST. However, in that case the client repeats the DHCPREQUEST from time to time,so if the DHCP server comes back up or becomes reachable again, the DHCP client will succeed in contacting it and renew the lease.

If the DHCP server is unreachable for an extended period of time,the DHCP client will attempt to rebind, by broadcasting its DHCPREQUEST rather than unicasting it. Because it is broadcast, the DHCPREQUEST message will reach all available DHCP servers. If some other DHCP server is able to renew the lease, it will do so at this time.

In order for rebinding to work, when the client successfully contacts a backup DHCP server, that server must have accurate information about the client’s binding.

Maintaining accurate binding information between two servers is a complicated problem; if both servers are able to update the same lease database, there must be a mechanism to avoid conflicts between updates on the independent servers.

A proposal for implementing fault-tolerant DHCP servers was submitted to the Internet Engineering Task Force, but never formalized

If rebinding fails, the lease will eventually expire. When the lease expires, the client must stop using the IP address granted to it in its lease.

At that time it will restart the DHCP process from the beginning by broadcasting a DHCPDISCOVER message. Since its lease has expired, it will accept any IP address offered to it.

Once it has a new IP address (presumably from a different DHCP server) it will once again be able to use the network. However, since its IP address has changed, any ongoing connections will be broken.

Security

The base DHCP does not include any mechanism for authentication.

Because of this, it is vulnerable to a variety of attacks. These attacks fall into three main categories:

  • Unauthorized DHCP servers providing false information to clients.
  • Unauthorized clients gaining access to resources.
  • Resource exhaustion attacks from malicious DHCP clients.

Because the client has no way to validate the identity of a DHCP server, unauthorized DHCP servers (commonly called “rogue DHCP”) can be operated on networks, providing incorrect information to DHCP clients.

This can serve either as a denial-of-service attack, preventing the client from gaining access to network connectivity,or as a man-in-the-middle attack.

Because the DHCP server provides the DHCP client with server IP addresses, such as the IP address of one or more DNS servers,an attacker can convince a DHCP client to do its DNS lookups through its own DNS server, and can therefore provide its own answers to DNS queries from the client.

This in turn allows the attacker to redirect network traffic through itself, allowing it to eavesdrop on connections between the client and network servers it contacts, or to simply replace those network servers with its own.

Because the DHCP server has no secure mechanism for authenticating the client, clients can gain unauthorized access to IP addresses by presenting credentials, such as client identifiers, that belong to other DHCP clients.

This also allows DHCP clients to exhaust the DHCP server’s store of IP addresses—by presenting new credentials each time it asks for an address, the client can consume all the available IP addresses on a particular network link, preventing other DHCP clients from getting service.

DHCP does provide some mechanisms for mitigating these problems. The Relay Agent Information Option protocol extension (RFC 3046, usually referred to in the industry by its actual number as Option 82  allows network operators to attach tags to DHCP messages as these messages arrive on the network operator’s trusted network.

This tag is then used as an authorization token to control the client’s access to network resources. Because the client has no access to the network upstream of the relay agent, the lack of authentication does not prevent the DHCP server operator from relying on the authorization token.

Another extension, Authentication for DHCP Messages (RFC 3118), provides a mechanism for authenticating DHCP messages. Unfortunately, as of 2002, RFC 3118 had not seen widespread adoption because of the problems of managing keys for large numbers of DHCP clients.

A 2007 book about DSL technologies remarked that

“there were numerous security vulnerabilities identified against the security measures proposed by RFC 3118. This fact, combined with the introduction of 802.1x, slowed the deployment and take-rate of authenticated DHCP, and it has never been widely deployed.”

A 2010 book notes that

“[t]here have been very few implementations of DHCP Authentication. The challenges of key management and processing delays due to hash computation have been deemed too heavy a price to pay for the perceived benefits.”

More recent (2008) architectural proposals involve authenticating DHCP requests using 802.1x or PANA (both of which transport EAP).

An IETF proposal was made for including EAP in DHCP itself, the so-called EAPoDHCP; this does not appear to have progressed beyond IETF draft level, the last of which dates to 2010.

IETF standards documents

  • RFC 2131, Dynamic Host Configuration Protocol
  • RFC 2132, DHCP Options and BOOTP Vendor Extensions
  • RFC 3046, DHCP Relay Agent Information Option
  • RFC 3397, Dynamic Host Configuration Protocol (DHCP) Domain Search Option
  • RFC 3942, Reclassifying Dynamic Host Configuration Protocol Version Four (DHCPv4) Options
  • RFC 4242, Information Refresh Time Option for Dynamic Host Configuration Protocol for IPv6
  • RFC 4361, Node-specific Client Identifiers for Dynamic Host Configuration Protocol Version Four (DHCPv4)
  • RFC 4436, Detecting Network Attachment in IPv4 (DNAv4)
  • RFC 3442, Classless Static Route Option for Dynamic Host Configuration Protocol (DHCP) version 4

 

9 Replies to “Dynamic Host Configuration Protocol”

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