DHCP Log Errors / What do they mean

I have been getting the following log entries in my DHCP logs when clients are logging in. Can anyone help explain what they mean for me?
Thank you.
Nov 13 08:43:04 ceasar bootpd[24097]: DHCP REQUEST [en0]: 1,0:16:cb:85:cb:4d <Garald>
Nov 13 08:43:04 ceasar bootpd[24097]: couldn't add option 'dhcp_router': not valid ip
Nov 13 08:43:04 ceasar bootpd[24097]: default route added as router
Nov 13 08:43:04 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpnetinfo_serveraddress
Nov 13 08:43:04 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpnetinfo_servertag
Nov 13 08:43:04 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpslp_directoryagent
Nov 13 08:43:04 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpslp_servicescope
Nov 13 08:43:04 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpproxy_auto_discoveryurl
Nov 13 08:43:04 ceasar bootpd[24097]: replying to 192.168.168.21
Nov 13 08:43:04 ceasar bootpd[24097]: ACK sent Garald 192.168.168.21 pktsize 310
Nov 13 08:43:04 ceasar bootpd[24097]: service time 0.001819 seconds
Nov 13 08:43:58 ceasar bootpd[24097]: DHCP REQUEST [en0]: 1,0:d:93:6f:f9:5e <DJ>
Nov 13 08:43:58 ceasar bootpd[24097]: couldn't add option 'dhcp_router': not valid ip
Nov 13 08:43:58 ceasar bootpd[24097]: default route added as router
Nov 13 08:43:58 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpnetinfo_serveraddress
Nov 13 08:43:58 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpnetinfo_servertag
Nov 13 08:43:58 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpslp_directoryagent
Nov 13 08:43:58 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpslp_servicescope
Nov 13 08:43:58 ceasar bootpd[24097]: subnet entry DE8A0309-A704-4E46-85B3-C1110C5910DA is missing option dhcpproxy_auto_discoveryurl
Nov 13 08:43:58 ceasar bootpd[24097]: replying to 192.168.168.18
Nov 13 08:43:58 ceasar bootpd[24097]: ACK sent DJ 192.168.168.18 pktsize 310
Nov 13 08:43:58 ceasar bootpd[24097]: service time 0.003374 seconds

DHCP has the ability to push a large number of configuration parameters out to the client.
Some are common (IP address, subnet mask, router address, etc.), but there is a myriad of esoteric options that are rarely used.
In this case your server is reporting that certain options are not configured. For example, 'dhcpnetinfo_servertag' (DHCP Option 113) indicates the name of the NetInfo parent domain. If you're not using NetInfo this will be empty, and that's what the log is reporting.
Overall, I don't see any problems from these logs. They're all normal, common messages based on how your DHCP server is configured.
You can read man bootpd to get a list of some of the other DHCP options that the server can provide, along with details of how to configure them.

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