DHCP Dynamic Host Configuration Protocol (Farsi User Guide)
Resource: Windows 2000 Server Resource kit TCP/IP Core Networking Guide

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DHCP Option Parameters

معمولا بیشترین موارد موجود در TCP/IP را می توان بر روی Client ها با انتخاب درست Option ها پیاده سازی کرد . مواردی مانند WINS, DNS, NetBios , Subnet, Default Gateway

این پارامترها را به دو دسته تقسیم می کنند. Information Options وProtocol Options که در زیر شرح داده شده.

 

هر دو مورد زیر مواردی می باشند که Admin باید بسیار جدی آنها را گرفته برای پیکربندی یک شبکه توسط DHCP Server .

 
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1. Information options

 

موارد زیر نمونه ای از Information Option می باشد که معمولا بیشتر از دیگر Option ها کاربرد دارند برای پیکربندی شبکه وClient ها .

Code

Description

3

Router

6

DNS server

15

DNS domain name

44

WINS server (NetBIOS name server)

45

NetBIOS datagram distribution server (NBDD)

46

WINS/NetBIOS node type

47

NetBIOS scope ID

Table 4.6 Common Information Option Types

تذکر Client ها این موارد را در زمان Lease کردن یک IP Address دریافت می کنند .

 
 
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2. Protocol options or Internal Protocol Options

موارد جدول 4.7  را می توان Internal Protocol Option نامید که سیستم ها بعد از برقراری ارتباط با DHCP Server این موارد را در زمان Renew شدن دوباره چک خواهند کرد . تا یک آرایش و نظمی

به مدت زمان Lease بدهد .

Code Description
51 Lease time
53 DHCP message type
55 Special option type used to communicate a parameter request list to the DHCP server
58 Renewal time value (T1)
59 Rebind time value (T2)

Table 4.7 Common Internal Protocol Option Types

 
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Options For Remote Access Clients

سیستم های RRAS Serv می توانند سرویس DHCP را همراه با Option ها البته نه تمامی آنها با یک سری محدودیت به Dial-up Connection هر RAS Client بدهد .جدول 4.8 این Option ها را

نمایش می دهد .البته بشرطی که Dial-up Connection در حالت DHCP-Enabled باشد .

 
 
Option Description
IP Address The remote access server proactively obtains an IP address from the DHCP server and builds a cached pool of DHCP leased addresses. The remote access server then distributes these cached IP addresses to the remote access client on demand and manages each lease. This is the only information from the DHCP server that the remote access client receives.
WINS server Values provided with the option type are taken from the remote access server dial-up connection properties if the remote access server is configured with WINS server addresses. The client acquires the list of WINS servers that are configured on the remote access server.
DNS server Values provided with the option type are taken from the remote access server dial-up connection properties if the remote access server is configured with DNS server addresses. The client acquires the first DNS server address listed in the remote access server's DNS server search list.
Subnet Mask The subnet mask corresponds to the default subnet mask associated with the standard address class type (Class A, B, or C) of the given IP address.
NetBIOS Scope ID NetBIOS scope ID information is not passed to the client. If you need to modify this setting, you must change it directly on the client.
Node Type Node Type is not taken from the DHCP lease but can change on the remote access client, depending on WINS information. If the remote access server has no locally defined WINS servers, a b-node remote access client remains a b-node client. If the remote access server has locally defined WINS servers, a b-node remote access client switches to h-node for the duration of the connection. Windows 95 clients do not automatically switch between node types if the remote access server supplies WINS addresses. In these cases, you must manually switch the node type.

Table 4.8 DHCP Options Used by Remote Access, Windows-Based, DHCP-Enabled Clients

 
DHCP Dynamic Host Configuration Protocol (Farsi User Guide)

LastUpdate:2005/04/05

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