the logging I found:
2018-07-10 16:00:27,442 INFO [DHCPServer] DHCP Message type: REQUEST (3), MAC:A4-4C-C8-13-89-1F/IP:0.0.0.0 144.2.148.44 relay ip:144.2.144.254 hostname:CI-11065 option 61:
2018-07-10 16:00:27,442 DEBUG [DHCPServer] handling: DHCPMessageResult (MAC: A4-4C-C8-13-89-1F, callerIp: 0.0.0.0, option50Ip: 144.2.148.44, relayIp: 144.2.144.254, hostName: CI-11065, fullyTrusted: false)
2018-07-10 16:00:27,442 DEBUG [Match] OS match detected, MAC=A4-4C-C8-13-89-1F, IP=0.0.0.0, OS detected=Windows 8/ 8.1/ 10/ 2012
2018-07-10 16:00:27,442 DEBUG [Match] DHCP Message details Type=REQUEST (3), Options=(1,3,6,15,31,33,43,44,46,47,121,249,252), Vendor Class Id=MSFT 5.0, TTL=64
2018-07-10 16:00:27,442 INFO [DHCPServer] Adding Option50 IP Mapping: A4-4C-C8-13-89-1F = 144.2.148.44 for relay IP: 144.2.144.254, hostname: CI-11065, os: Windows 8/ 8.1/ 10/ 2012, fully trusted: false
2018-07-10 16:00:27,442 INFO [MacToIpMessageHandler] ESDMAC:13-89-1F,ESDIP:144.2.148.44 Processing macToIp: MAC: A4-4C-C8-13-89-1F, IP: 144.2.148.44, Relay IP: 144.2.144.254, Hostname: CI-11065, OS Name: Windows 8/ 8.1/ 10/ 2012, DHCP Server Response: false, Request: true, from Appliance: 10.2.112.2
2018-07-10 16:00:27,442 DEBUG [MacToIpMessageHandler] ESDMAC:13-89-1F,ESDIP:144.2.148.44 MAC-to-IP message is not fully trusted, the option is set to use this data for end-systems on non-VLAN based switches, (No Switch Found), only storing data in DB.
2018-07-10 16:00:27,442 DEBUG [NacToNacMessageSender-MacToIpMessage] Adding message: MAC: A4-4C-C8-13-89-1F, IP: 144.2.148.44, Relay IP: 144.2.144.254, Hostname: CI-11065, OS Name: Windows 8/ 8.1/ 10/ 2012, DHCP Server Response: false, Request: true, from Appliance: 10.2.112.2
Johan Hendrik
System Architect
Audax