DHCP – Cheat Sheet – Part-2
Version 1
PAD Option (0)
0
82
DHCP Relay Agent (82)
Lease Time (51)
1
DHCP
Options
51
3
15
Domain Name Option (15)
Subnet Mask Option (1)
6
Router Option (3)
DNS Server Option (6)
12
Host Name Option (12)
networkwalks.com
DHCP State Transitions
IP Address Assignment Methods
Root
q Initializing
Manual
DHCP Server assigns IP Addresses based on certain client
parameter (e.g. MAC Address)
Automatic
DHCP Server permanently assigns IP address to clients
from the pool defined by the admin. Same client gets
same IP even after disconnect/connect
Dynamic
DHCP Server assigns IP address to clients from the pool
defined by the admin till the lease time defined by admin.
Same client gets different IP after disconnect/connect
DHCPOFFER
DHCPDISCOVER
w Selecting
www.networkwalks.com
DHCPREQUEST
e Requesting
DHCP Frame Format
DHCPACK
r Bound
1
DHCPRELEASE
DHCPACK
DHCPACK
yRe-binding
DHCPREQUEST
16
HW Type
24
32
Hops
HW Add Length
Transaction ID
Seconds
Flags
CIAddr (Client IP Address)
YIAddr (Your IP Address)
SIAddr (Server IP Address)
GIAddr (GW IP Address)
CHAddr (Client HW Address) - 16B
SName (Server Name) - 64B
Boot Filename- 128B
Options – 214B max
www.networkwalks.com
t Renewing
8
OpCode
DHCPNACK
DHCPREQUEST
≈
≈
≈
www.networkwalks.com
≈
Variable
Length
L2
IP
TCP/UDP L7
Header Header Header Header
L7 Data
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