Personal information
Name: Zhang Yue
Student ID: 201821121006
Class: calculated 1811
One: Purpose:
1. Skilled using Packet Tracer tool. Analysis caught application layer protocol packets, application layer protocol-depth understanding, including syntax, semantics, timing.
II: Experiment:
Use Packet Tracer, properly configured network parameter, packet data capture and analysis application layer protocol, the protocol comprising DNS, FTP, DHCP, stmp, pop3. Steps include:
- Establish a network topology
- Configuration parameters
- Ethereal
- Analysis of the data packet
Three: this experiment:
1) establish a network topology
Use the pc-establish a network topology with server-side services:
Pc side IP address configuration parameters: 192.168.1.6
Server configuration parameters: 192.168.1.21
Three: the application layer protocol analysis:
In the DNS server service, configuration information related to domain name
The DNS address pc then subsequently changed to the same address terminal
Enter a name added to the DNS server in the pc end of the URL:
When capture option only DNS
Packet capture analysis results:
NAME, represents the domain name information to be queried, yue as second level domain, zhang as a domain name;
TYPE, represents the query type; CLASS: Query categories: usually 1, stands for Internet data. 0 only when the cache but not output.
LENGTH: Resource data length IP: IP address corresponding to the domain name.
FTP analysis
The first enable FTP server, then returns FTP package check
Then open end pc Command Prompt input command on the command line
Packet capture and analysis
The server sending a response message;
Where code: 220 represents a successful entry interface
FTP Command: USRE represented enter a user name:
The following shows the password:
When you log in successfully time will show the following:
DHCP packet capture analysis of
1. First open server DHCP, tune into on-state:
2. On the PC side, into a static DHCP stdio
3. Select the DHCP packet
4. packet capture and analysis
Assigned to the display of YOUR CLIENT ADDRESS: server assigned to the client IP address
SERVER ADDRESS:192.168.1.21 表示服务器ip地址为192.168.1.21，即成功分配了地址
SERVER HOSTNAME(64 BYTES) 表示服务器主机名有64字节
FILE(128 BYTES) 表示该文件包含128字节
关于smtp和pop3的分析：
1.首先为pc端配置地址参数：
2.接着将DNS设置为On，添加三个IP地址的域名：
3.然后在PC端的邮箱选项中加入自己的邮箱账户、地址，以及前面的pop3和smtp域名；
4. 接着又要在email中中添加新用户
5.发送邮件
6.抓包以及分析结果：
SRC IP是指负载均衡的时候选路依据源ip地址。DST IP是依据目的ip地址。