Observe what the DHCP client does when it cannot reach the DHCP server.
What will be an ideal response?
When the DHCP server is kill, the DHCP client can no longer reach the server, it kept sending DHCP REQUEST (totally 8) and then it shifted to send DHCP DISCOVER messages (totally 4) before going to sleep. Then it released its IP after ~1 minute. The process is shown below:
bound to 10.0.1.10 -- renewal in 51 seconds.
[kill the dhcpd server]
DHCPREQUEST on eth0 to 10.0.1.21 port 67
DHCPREQUEST on eth0 to 10.0.1.21 port 67
DHCPREQUEST on eth0 to 10.0.1.21 port 67
DHCPREQUEST on eth0 to 10.0.1.21 port 67
DHCPREQUEST on eth0 to 10.0.1.21 port 67
DHCPREQUEST on eth0 to 10.0.1.21 port 67
DHCPREQUEST on eth0 to 10.0.1.21 port 67
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
receive_packet failed on eth0: Network is down
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 16
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
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What will be an ideal response?