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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