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The Dynamic Host Configuration Protocol (DHCP) provides a framework for passing configuration information to hosts on a TCP/IP network. Configuration parameters and other control information are carried in tagged data items that are stored in the 'options' field of the DHCP message. The data items themselves are also called "options."
Here are most used DHCP options codes:
dhcp-option=1,255.255.255.248 # subnet mark
dhcp-option=2,+7200 # UTC +2:00
dhcp-option=3,172.16.1.1 # default g/w for LAN client
dhcp-option=4,172.16.1.1 #Set the Time Server Option
dhcp-option=5,172.16.0.3 #Set the DNS server for LAN clients
dhcp-option=6,172.16.0.2,193.226.128.1,193.226.128.129 #Set the DNS server for LAN clients
dhcp-option=7,172.16.0.3 # Set the SYSLOG server
dhcp-option=8,172.16.0.1,172.16.0.2 #Specifies a list of Quote of the Day servers available to the client. The servers SHOULD be listed in order of preference.
dhcp-option=9,172.16.0.1,172.16.0.2 #Specifies a list of LPR servers available to the client. The servers SHOULD be listed in order of preference.
dhcp-option=15,172.16.0.2 #Set the domain name that client should use when resolving hostnames via DNS
dhcp-option=16,172.16.0.2 #Set the IP address of the client's swap server.
dhcp-option=18,172.16.1.7 # BOOTP more info
dhcp-option=19,0 # Set option ip-forwarding off
dhcp-option=27,1 #Set the "all subnets are local" flag
dhcp-option=40,gigi #Set the NIS domain name to "gigi"
dhcp-option=42,172.16.0.2 # Set the NTP server
dhcp-option=44,172.16.0.2 # Set the WINS
dhcp-option=45,0.0.0.0 # Set the netbios datagram distribution server
dhcp-option=46,8 # Set the netbios node type
dhcp-option=66,172.16.0.2 # TFTP
dhcp-option=121,192.168.1.0/24,10.0.0.0/8,5.6.7.8 #Send RFC-3442 classless static routes (note the netmask encoding)
dhcp-option=128,e4:45:74:68:00:00 #Send the etherboot magic flag
dhcp-option=129,NIC=eepro100 #Send etherboot options (a string)
Be aware that Windows hosts send first client-identifier while Linux hosts send the hardware-address. This is for cisco users who can configure in the dhcp pool hardware-address or client-identifier
Note:
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