Hello I'm playing with freeradius dhcp support, and get the following problem. Freeradius 2.1.7, option 82, for dhcp snooping to work I have not only get DHCP-Relay-Agent-Information (option 82) in request but send it back to dhcp relay. Just test examle (radiusd in debug mode): DHCP-Discover: DHCP-Opcode = Client-Message DHCP-Hardware-Type = Ethernet ...skip... DHCP-Parameter-Request-List = DHCP-Domain-Name-Server DHCP-Relay-Agent-Information = 0x010600040001000202080006001e589e836f DHCP-Offer: Sending DHCP-Offer of id 69dd544f from 1.1.1.1:67 to 1.1.1.2:67 DHCP-Opcode = Server-Message DHCP-Hardware-Type = Ethernet ...skip... DHCP-IP-Address-Lease-Time = 3600 DHCP-Relay-Agent-Information = 0x010600040001000202080006001e589e836f So far, so good, but tcpdump shows me: DHCP-Discover: Agent-Information Option 82, length 18: Circuit-ID SubOption 1, length 6: \000\004\000\001\000\002 Unknown SubOption 2, length 8: 0x0000: 0006 001e 589e 836f DHCP-Offer: Agent-Information Option 82, length 20: Unknown SubOption 0, length 18: So as I can see option 82 length is 20 instead of 18. Why? -- Alexandr Sviridov