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Second experiment: using Packet Tracer application layer protocol analysis
table of Contents
1 Purpose
Familiar with Packet Tracer tool. Analysis caught application layer protocol packets, application layer protocol-depth understanding, including syntax, semantics, timing.
2 Experimental content
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
3. The test report
(1) establish a network topology
Given a network topology map, and explained briefly.
Select a client and server to establish a connection at End Devices click the desktop and select Configure client ip configuration IP address of the PC (172.20.204..26) IP address of the server's server (172.20.204.27)
3.1 DNS
(1) Configuration Parameters
IP address of the client PC's (172.20.204..26) IP address of the server's server (172.20.204.27)
Related to the domain name jia.li
Click to select the desktop PC configuration ip configuration of DNS address for the server address here (172.20.204.27) DNS server configured as shown in the display, note the DNS service to be open to On, the name can be freely
(2) capture and analyze packets captured
After the client PC with a web browser (web browser) to access the server domain names to spend optional step settings can be accessed directly by clicking DNS server ip address of the packet capture options
TYPE represents the query type 4
CLASS 1 represents a query class
TTL represents the survival time in units of S
Length LENGTH represents the resource data 30
3.2 FTP
(1) Configuration Parameters
The client PC's IP address (172.20.204..26) IP address of the server's server (172.20.204.27) choose to configure FTP username and password as shown here is the default configuration
2 capture
Use commder command access to the server from a PC
Can be accessed by the domain name or IP, and after the correct user name and password to an internal data packet graspable
FTP command and pass display 123 displays password
3.3 DHCP
(1) Configuration Parameters
In the server configuration parameters to parameters and store the address of the client and open a connection to be noted that NO
(2) capture and analysis
As a result of dynamic IP so every time to get the IP address is different
3.4 smtp and pop3
(1) Configuration
Is provided for a two domain names for receiving a sent email EMAIL
Ethereal
data: mail body
src-ip: load balancing when routing based on source IP address.
dst-ip: The IP address based on the destination.
pop3: reading the mail protocol
smtp: Send mail protocol
table of Contents
1 Purpose
Familiar with Packet Tracer tool. Analysis caught application layer protocol packets, application layer protocol-depth understanding, including syntax, semantics, timing.
2 Experimental content
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
3. The test report
(1) establish a network topology
Given a network topology map, and explained briefly.
Select a client and server to establish a connection at End Devices click the desktop and select Configure client ip configuration IP address of the PC (172.20.204..26) IP address of the server's server (172.20.204.27)
3.1 DNS
(1) Configuration Parameters
IP address of the client PC's (172.20.204..26) IP address of the server's server (172.20.204.27)
Related to the domain name jia.li
Click to select the desktop PC configuration ip configuration of DNS address for the server address here (172.20.204.27) DNS server configured as shown in the display, note the DNS service to be open to On, the name can be freely
(2) capture and analyze packets captured
After the client PC with a web browser (web browser) to access the server domain names to spend optional step settings can be accessed directly by clicking DNS server ip address of the packet capture options