计算机三级网络技术-----DHCP报文分析

DHCP工作流程DHCP：Request(请求)，Type(类型)：DHCP discoverDHCP：Reply，Type(类型)：DHCP offerDHCP：Request(请求)，Type(类型)：DHCP requestDHCP：Reply，Type(类型)：DHCP ack常出的是这种类型另一种类型为ping还有续约类型...

白菜皮皮

3575人浏览 · 2022-03-15 21:36:23

白菜皮皮 · 2022-03-15 21:36:23 发布

DHCP工作流程

DHCP：Request(请求)，Type(类型)：DHCP discover

DHCP：Reply，Type(类型)：DHCP offer

DHCP：Request(请求)，Type(类型)：DHCP request

DHCP：Reply，Type(类型)：DHCP ack

如图(a)所示，在某DHCP客户机上捕获了5条报文，并对第5条报文进行了解析，图(b)是在该客户机捕获上述报文后执行ipconfig /all 命令后得到的部分信息。分析图中信息，并补全空白处的内容。

编号		源IP地址			目的IP地址		报文摘要		报文捕获时间
1		192.168.1.1			192.168.1.36		DHCP:Request, Type:DHCP release		09:06:55
2		0.0.0.0			255.255.255.255		DHCP:Request,Type:DHCP discover		09:07:00
3		192.168.1.36			[1}255.255.255255		DHCP:Reply, Type:DHCP offer		09:07:00
	4		0.0.0.0			255.255.255.255		DHCP:Request, Type:DHCP request		09:07:00
	5		192.168.1.36			[2]255.255.255.255		DHCP:Reply, Type:DHCP ack		09:07:00
				DHCP: ----- DHCP Header ----- DHCP: Boot record type = 2 (Reply) DHCP: Hardware address type = 1 (10M Ethernet) DHCP: Hardware address length = 6 bytes DHCP: Hops = 0 DHCP: Transaction id = 2219131D DHCP: Elapsed boot time = 0 seconds DHCP: Flags = 0000 DHCP: 0 = no broadcast DHCP: Client self-assigned address = [0.0.0.0] DHCP: Client address = [192.168.1.1] DHCP: Next Server to use in bootstrap = [0.0.0.0] DHCP: Relay Agent = [0.0.0.0] DHCP: Client hardware address = 001122334455 DHCP: Vendor Information tag = 63825363 DHCP: Message Type = 5 (DHCP Ack) DHCP: Address renewel interval = 345600 (seconds) DHCP: Address rebinding interval = 604800 (seconds) DHCP: Request IP Address lease time = 691200 (seconds) DHCP: Subnet mask = 255.255.255.0 DHCP: Gateway address = [192.168.1.100] DHCP: Domain Name Server address = [202.106.46.151]

图(a) 在DHCP客户机上捕获的IP报文及相关分析

Ethernet adapter 本地连接:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom 440x 10/100 Integrated Controller
Physical Address. . . . . . . . . : [3] 001122334455 物理地址
Dhcp Enabled. . . . . . . . . . . : [4] yes
IP Address. . . . . . . . . . . . : 192.168.1.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : [5] 192.168.1.100 网关

下面的明天再更新有点晚了

ping类型

公司网络DHCP服务器地址为192.168.0.2，可分配IP地址为192.168.0.6-192.168.0.254，缺省网关的地址为192.168.0.1。网络中某客户机从服务器获取IP地址后，在客户机上执行ping www.bupt.edu.cn命令的过程中，连续捕获的5条报文及对第5条报文的部分解析如下图所示。请补全图中空白处的信息。

编号		源IP地址		目的IP地址		报文摘要
1		192.168.0.6		192.168.0.3		Dns:Query
	2		[1]
	3		192.168.0.6		114.255.40.66		Ping:Request
	4		192.168.0.6		192.168.0.2		DHCP:Request, Type: Request
	5		[3]		[4]		DHCP:Reply, Type:Ack
DHCP: ----- DHCP Header ----- DHCP: Boot record type = 2 (Reply) DHCP: Hardware address type = 1 (10M Ethernet) DHCP: Hardware address length = 6 bytes DHCP: Client self-assigned address = [192.168.0.6] DHCP: Client address = [192.168.0.6] DHCP: Next Server to use in bootstrap = [0.0.0.0] DHCP: Relay Agent = [0.0.0.0] DHCP: Client hardware address = 001122334455 DHCP: Vendor Information tag = 63825363 DHCP: Message Type = 5 DHCP: Address renewel interval = 345600 (seconds) DHCP: Address rebinding interval = 604800 (seconds) DHCP: Request IP Address lease time = 691200 (seconds) DHCP: Subnet mask = 255.255.255.0 DHCP: Gateway address = [192.168.0.1] DHCP: Domain Name Server address = [ [5]]

常出的是这种类型

另一种类型为ping

还有续约类型

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