Dynamic Host Configuration Protocol (DHCP)

Слайд 2

DHCP processing

DHCP processing

Слайд 3

DHCP client broadcasts a DHCPDISCOVER packet DHCP servers broadcast a DHCPOFFER

DHCP client broadcasts a DHCPDISCOVER packet
DHCP servers broadcast a DHCPOFFER packet
DHCP

client broadcasts a DHCPREQUEST packet
DHCP Server1 broadcasts a DHCPACK packet

How DHCP Lease Generation Works

Слайд 4

87.5% of lease duration has expired DHCP client отправляет DHCPREQUEST packet

87.5% of lease duration has expired

DHCP client отправляет DHCPREQUEST packet
DHCP Server1

отправляет DHCPACK packet
Если клиент не обновил ip адрес по истечению 50% времени лизинга, то повторная попытка будет по истичению 87.5% времени лизинга.
Если клиент не обновил лизинг на 87.5%, то по истечению 100% времени лизинга процесс снова начнется с пункта 1.

DHCP
clients

50% of lease duration has expired

100% of lease duration has expired

How DHCP Lease Renewal Works

Слайд 5

Routers (non–RFC 1542 compliant) Subnet A Subnet B DHCP Relay Agent?

Routers
(non–RFC 1542 compliant)

Subnet A

Subnet B

DHCP Relay Agent?

A DHCP relay agent слушает

DHCP broadcasts от DHCP clients и переправляет через роутер к DHCP servers в другие подсети

DHCP server

DHCP relay agent

DHCP broadcast

Unicast

Unicast

Слайд 6

DHCP Server Authorization DHCP Server2 checks with the domain controller to

DHCP Server Authorization

DHCP Server2 checks with the domain controller to obtain

a list of authorized DHCP servers

If DHCP Server2 does not find its IP address on the list, the service does not start and support DHCP clients

DHCP client receives IP address
from authorized DHCP Server1

DHCP Server1 checks with the domain controller to obtain a list of authorized DHCP servers

если DHCP Server1 ищет ip адрес в списках, сервис запущен и работает с DHCP клиентами

DHCP Server1

DHCP Server2

DHCP authorization registers the DHCP Server service in the Active Directory domain to support DHCP clients

Слайд 7

DHCP Scopes? A DHCP scope область ip адресов из NA доступных

DHCP Scopes?

A DHCP scope область ip адресов из NA доступных для

раздачи
DHCP scope свойства:
Network Addres
Время лизинга
Имя Scope
Subnet mask
Network IP address range
Исключения range