IP和TCP抓包实验

实验拓扑

实验解法

1.修改设备名称
步骤1：在R1上进入系统视图，修改设备名称为R1

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<H3C>system-view 
System View: return to User View with Ctrl+Z.
[H3C]sysname R1
[R1]

步骤2：在R2上进入系统视图，修改设备名称为R2

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<H3C>system-view 
System View: return to User View with Ctrl+Z.
[H3C]sysname R2
[R2]

2.配置IP地址

步骤1：在R1上进入g0/0接口的接口视图，配置IP地址为192.168.1.1/24

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[R1]interface g0/0
[R1-GigabitEthernet0/0]ip address 192.168.1.1 24

步骤2：在R2上进入g0/0接口的接口视图，配置IP地址为192.168.1.2/24

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[R2]interface g0/0
[R2-GigabitEthernet0/0]ip address 1192.168.1.2 24

3.开启抓包

步骤1：右键点击R1和R2相连的链路，点击开启抓包，如图所示

4.在R1上PING R2

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[R1]ping 192.168.1.2
Ping 192.168.1.2 (192.168.1.2): 56 data bytes, press CTRL_C to break
56 bytes from 192.168.1.2: icmp_seq=0 ttl=255 time=1.000 ms
56 bytes from 192.168.1.2: icmp_seq=1 ttl=255 time=0.000 ms
56 bytes from 192.168.1.2: icmp_seq=2 ttl=255 time=0.000 ms
56 bytes from 192.168.1.2: icmp_seq=3 ttl=255 time=0.000 ms
56 bytes from 192.168.1.2: icmp_seq=4 ttl=255 time=0.000 ms

--- Ping statistics for 192.168.1.2 ---

5.开启Wireshark，查看抓取的Ping包内容

步骤1：点开HCL右侧边栏，右键点击GE0/0接口，并点击启动Wireshark，如图所示

步骤2：在Wireshark中可以看到抓到的数据包，紫色高亮的就是Ping包，如图所示

步骤3：双击某个Ping包，查看数据包详细内容，展开Internet Protocol Version 4，可以查看到详细的IP头部格式，如图所示

6.在R2上开启FTP服务，创建用户wangdaye，密码123456

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[R2]ftp server enable 
[R2]local-user wangdaye class manage 
New local user added.
[R2-luser-manage-wangdaye]password simple 123456
[R2-luser-manage-wangdaye]authorization-attribute user-role level-15
[R2-luser-manage-wangdaye]service-type ftp

7.在R1上访问FTP服务，输入用户名和密码

注意：FTP登录功能只能在用户视图下使用

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<R1>ftp 192.168.1.2
Press CTRL+C to abort.
Connected to 192.168.1.2 (192.168.1.2).
220 FTP service ready.
User (192.168.1.2:(none)): wangdaye
331 Password required for wangdaye.
Password:
230 User logged in.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp>

8.刷新Wireshark，发现已经抓取到FTP的登录名和密码，如图所示



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