DELL S50V User Manual

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Dynamic Host Configuration Protocol

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DHCP uses UDP as its transport protocol. The server listens on port 67 and transmits to port 68; the client 
listens on port 68 and transmits to port 67. The configuration parameters are carried as options in the 
DHCP packet in Type, Length, Value (TLV) format; many options are specified in RFC 2132. To limit the 
number parameters that servers must provide, hosts specify the parameters that they require, and the server 
sends only those; some common options are given in 

Subnet Mask

1

Specifies the clients subnet mask.

Router

3

Specifies the router IP addresses that may serve as the client’s default 
gateway.

Domain Name Server

6

Specifies the the DNS servers that are available to the client.

Domain Name

15

Specifies the domain name that client should use when resolving hostnames 
via DNS.

IP Address Lease Time

51

Specifies the amount of time that the client is allowed to use an assigned IP 
address.

DHCP Message Type

53

1: DHCPDISCOVER
2: DHCPOFFER
3: DHCPREQUEST
4: DHCPDECLINE
5:DHCPACK
6:DHCPNACK
7:DHCPRELEASE
8:DHCPINFORM

Parameter Request List

55

Clients use this option to tell the server which parameters it requires. It is a 
series of octects where each octet is DHCP option code.

Renewal Time

58

Specifies the amount of time after the IP address is granted that the client 
attempts to renew its lease with the original server.

Rebinding Time

59

Specifies the amount of time after the IP address is granted that the client 
attempts to renew its lease with any server, if the original server does not 
respond.

End

255

Signals the last option in the DHCP packet.

op

htype

hlen

hops

xid

secs

yiaddr

siaddr

flags

ciaddr

giaddr

chaddr

sname

options

file

Code

Length

Value