Goog day again :) According to draft-ietf-dhc-dhcpinform-clarify-06 the reply to the DHCP Inform request should be ACK to the ciaddr if it present, even if there is a giaddr or other addr's. FR 3.0.7 is repliing to giaddr whatever I'm doing... (27) Received code 1032 Id -1241645939 from 10.133.242.246:68 to 10.133.200.150:67 length 320 (27) DHCP-Opcode = Client-Message (27) DHCP-Hardware-Type = Ethernet (27) DHCP-Hardware-Address-Length = 6 (27) DHCP-Hop-Count = 1 (27) DHCP-Transaction-Id = 3053321357 (27) DHCP-Number-of-Seconds = 768 (27) DHCP-Flags = 0 (27) DHCP-Client-IP-Address = 10.133.44.151 (27) DHCP-Your-IP-Address = 0.0.0.0 (27) DHCP-Server-IP-Address = 0.0.0.0 (27) DHCP-Gateway-IP-Address = 10.133.242.246 (27) DHCP-Client-Hardware-Address = 98:4b:e1:b5:b1:b4 (27) DHCP-Message-Type += DHCP-Inform (27) DHCP-Client-Identifier += 0x01984be1b5b1b4 (27) DHCP-Hostname += '\213\245\340\240-\217\212' (27) DHCP-Vendor-Class-Identifier += 0x4d53465420352e30 (27) DHCP-Parameter-Request-List += DHCP-Subnet-Mask (27) DHCP-Parameter-Request-List += DHCP-Domain-Name (27) DHCP-Parameter-Request-List += DHCP-Router-Address (27) DHCP-Parameter-Request-List += DHCP-Domain-Name-Server (27) DHCP-Parameter-Request-List += DHCP-NETBIOS-Name-Servers (27) DHCP-Parameter-Request-List += DHCP-NETBIOS-Node-Type (27) DHCP-Parameter-Request-List += DHCP-NETBIOS (27) DHCP-Parameter-Request-List += DHCP-Perform-Router-Discovery (27) DHCP-Parameter-Request-List += DHCP-Static-Routes (27) DHCP-Parameter-Request-List += DHCP-Classless-Static-Route (27) DHCP-Parameter-Request-List += DHCP-Site-specific-25 (27) DHCP-Parameter-Request-List += DHCP-Vendor (27) DHCP-Parameter-Request-List += DHCP-Site-specific-28 (27) DHCP-Relay-Agent-Information += 0x010600040066010b020800067072cf1c79e7 Trying sub-section dhcp DHCP-Inform {...} (27) dhcp DHCP-Inform { (27) update reply { (27) Packet-Dst-Port = 67 (27) DHCP-Message-Type = DHCP-Ack (27) EXPAND %{Packet-Dst-IP-Address} (27) --> 10.133.200.150 (27) DHCP-DHCP-Server-Identifier = 10.133.200.150 (27) DHCP-Site-specific-28 = 0x0a (27) } # update reply = noop (27) [ok] = ok (27) } # dhcp DHCP-Inform = ok (27) DHCP: Reply will be unicast to giaddr from original packet DHCP-Opcode = Server-Message DHCP-Hardware-Type = Ethernet DHCP-Hardware-Address-Length = 6 DHCP-Hop-Count = 1 DHCP-Transaction-Id = 3053321357 DHCP-Number-of-Seconds = 0 DHCP-Flags = 0 DHCP-Client-IP-Address = 10.133.44.151 DHCP-Your-IP-Address = 0.0.0.0 DHCP-Server-IP-Address = 0.0.0.0 DHCP-Gateway-IP-Address = 10.133.242.246 DHCP-Client-Hardware-Address = 98:4b:e1:b5:b1:b4 DHCP-Server-Host-Name = '' DHCP-Boot-Filename = '' DHCP-DHCP-Server-Identifier = 10.133.200.150 DHCP-Site-specific-28 = 0x0a Sending DHCP-Ack Id b5fdfc8d from 10.133.200.150:67 to 10.133.242.246:68 (27) Sent code 1029 Id -1241645939 from 10.133.200.150:67 to 10.133.242.246:68 length 300 (27) DHCP-Message-Type = DHCP-Ack (27) DHCP-DHCP-Server-Identifier = 10.133.200.150 (27) DHCP-Site-specific-28 = 0x0a (27) DHCP-Opcode = Server-Message (27) DHCP-Hardware-Type = Ethernet (27) DHCP-Hardware-Address-Length = 6 (27) DHCP-Hop-Count = 1 (27) DHCP-Transaction-Id = 3053321357 (27) DHCP-Flags = 0 (27) DHCP-Client-IP-Address = 10.133.44.151 (27) DHCP-Gateway-IP-Address = 10.133.242.246 (27) DHCP-Client-Hardware-Address = 98:4b:e1:b5:b1:b4 (27) DHCP-Relay-IP-Address = 10.133.242.246 (27) Finished request