What are the common commands for DHCP packet search in Linux systems?

In Linux systems, common commands for finding DHCP packets can help network administrators diagnose network problems and determine whether the communication between the DHCP server and client is normal. The following are some commonly used commands and their specific code examples:

1. tcpdump command:
   tcpdump is a powerful network packet capture Tools that can be used to capture and analyze network packets. You can view the interaction process of DHCP packets through tcpdump.

   # tcpdump -i <interface> port 67 or port 68

   This command will monitor the transmission of DHCP packets on the specified network interface. You can replace <interface></interface> with the actual network interface name.

2. dhclient command:
   dhclient is a DHCP client program on the Linux system, which can manually trigger the DHCP interaction process. Through the dhclient command, you can view the DHCP request and response process.

   # dhclient -v <interface>

   This command will execute the DHCP client on the specified network interface and print detailed debugging information.

3. dhcpdump command:
   dhcpdump is a tool specially used to analyze DHCP packets, which can more easily view DHCP packets of detailed content.

   # dhcpdump -i <interface>

   This command will capture DHCP packets on the specified network interface and display the contents of the DHCP packets in an easy-to-read format.

4. wireshark command:
   wireshark is a network packet analysis software that can also be used to capture and analyze DHCP packets.

   # wireshark

   After running this command, the graphical interface of wireshark will be opened. You can filter and view the contents of DHCP packets through the interface.

Through the above commands, network administrators can more easily find, analyze and diagnose the transmission of DHCP packets in the Linux system, helping to locate network problems and solve them accordingly.

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