Below is the list of other interesting options that can be provided to clients to ease their initial configuration:. Some options are used by the client to provide the server with enough information to answer more specifically. For example, an IP phone may need some additional information about the registration server, or a graphical passive terminal may require the location of the font server. Two main options are used in this case: the vendor class identifier option 60 and the client identifier option Client identifier is unique and helps the DHCP server to manage its clients and leases, it is generally set to the MAC address of the network interface on a local network.
Network Rollout. Active Directory Policies. Auto-Manage Firewall. Obtain the Time. Windows Slave. Linux Slave. Windows Master. Correction Limits. Serve the Time. Domain Role. Slave Timings.
Client Timings. Client Correction Limits. Broadcasts and Multicasts. Symmetric Keys. Windows Event Viewer.
SNMP Traps. Broadcast Address Option This option specifies the broadcast address in use on the client's subnet. Legal values for broadcast addresses are specified in section 3.
The code for this option is 28, and its length is 4. A value of 0 indicates that the client should not perform mask discovery. A value of 1 means that the client should perform mask discovery. The code for this option is 29, and its length is 1. A value of 0 indicates that the client should not respond.
A value of 1 means that the client should respond. The code for this option is 30, and its length is 1. A value of 0 indicates that the client should not perform router discovery. A value of 1 means that the client should perform router discovery. The code for this option is 31, and its length is 1. Router Solicitation Address Option This option specifies the address to which the client should transmit router solicitation requests.
The code for this option is 32, and its length is 4. Static Route Option This option specifies a list of static routes that the client should install in its routing cache. If multiple routes to the same destination are specified, they are listed in descending order of priority. The routes consist of a list of IP address pairs.
The first address is the destination address, and the second address is the router for the destination. The default route 0. See section 3. Link Layer Parameters per Interface This section lists the options that affect the operation of the data link layer on a per-interface basis.
A value of 0 indicates that the client should not attempt to use trailers. A value of 1 means that the client should attempt to use trailers. The code for this option is 34, and its length is 1. The time is specified as a bit unsigned integer. The code for this option is 35, and its length is 4. A value of 0 indicates that the client should use RFC encapsulation. A value of 1 means that the client should use RFC encapsulation.
The value is represented as an 8-bit unsigned integer. The minimum value is 1. The code for this option is 37, and its length is 1. A value of zero indicates that the client should not generate keepalive messages on connections unless specifically requested by an application.
The code for this option is 38, and its length is 4. TCP Keepalive Garbage Option This option specifies the whether or not the client should send TCP keepalive messages with a octet of garbage for compatibility with older implementations. A value of 0 indicates that a garbage octet should not be sent. A value of 1 indicates that a garbage octet should be sent. Application and Service Parameters This section details some miscellaneous options used to configure miscellaneous applications and services.
Its minimum length is 4, and the length MUST be a multiple of 4. Vendor Specific Information This option is used by clients and servers to exchange vendor- specific information. The information is an opaque object of n octets, presumably interpreted by vendor-specific code on the clients and servers.
The definition of this information is vendor specific. The vendor is indicated in the vendor class identifier option. Servers not equipped to interpret the vendor-specific information sent by a client MUST ignore it although it may be reported. Clients which do not receive desired vendor-specific information SHOULD make an attempt to operate without it, although they may do so and announce they are doing so in a degraded mode.
If no code is present, then the end of the enclosing vendor-specific information field is taken as the end of the encapsulated vendor-specific extensions field. The code for this option is 43 and its minimum length is 1. T2 n D1 D The minimum length of the option is 4 octets, and the length must always be a multiple of 4. The length of this option is always 1. See [ 19 ], [ 20 ], and [ 8 ] for character-set restrictions.
The minimum length of this option is 1. The minimum length of this option is 4 octets, and the length MUST be a multiple of 4.
The minimum length of this option is 4, and the length MUST be a multiple of 4. Its minimum length is 0 indicating no home agents are available and the length MUST be a multiple of 4. It is expected that the usual length will be four octets, containing a single home agent's address.
The code for the SMTP server option is The code for the POP3 server option is The code for the NNTP server option is The code for the WWW server option is The code for the Finger server option is The code for the IRC server option is The code for the StreetTalk Directory Assistance server option is The code for this option is 50, and its length is 4.
The code for this option is 51, and its length is 4. A DHCP server inserts this option if the returned parameters will exceed the usual space allotted for options. If this option is present, the client interprets the specified additional fields after it concludes interpretation of the standard option fields. The code for this option is 52, and its length is 1. The code for this option is 66, and its minimum length is 1. The code for this option is 67, and its minimum length is 1.
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