The server is rejecting the packet due to option 43 content:
2019-05-07 12:26:53.353 DEBUG [kea-dhcp4.bad-packets/12781] DHCP4_PACKET_DROP_0007 [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815: failed to process packet: DHCPv4 Option 43 is too big. This happens when the length for a DHCPv4 option is larger than 255. A PCAP would be helpful. Cheers, Thomas A pcap file would be helpful here, but On 5/7/19 6:33 AM, Jan Sielemann wrote:
Clients lose their lease and are disconnected - this is what's happening: 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.packets/12781] DHCP4_PACKET_RECEIVED [hwtype=1 00:1b:fe:04:1d:c6], cid=[01:00:1b:fe:04:1d:c6], tid=0x99722544: DHCPDISCOVER (type 1) received from 0.0.0.0 to 255.255.255.255 on interface net0p0 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.packets/12781] DHCP4_QUERY_DATA [hwtype=1 00:1b:fe:04:1d:c6], cid=[01:00:1b:fe:04:1d:c6], tid=0x99722544, packet details: local_address=255.255.255.255:67, remote_address=0.0.0.0:68, msg_type=DHCPDISCOVER (1), transid=0x99722544, options: type=012, len=005: "75111" (string) type=050, len=004: 192.168.2.50 (ipv4-address) type=053, len=001: 1 (uint8) type=055, len=009: 1(uint8) 3(uint8) 6(uint8) 12(uint8) 15(uint8) 28(uint8) 40(uint8) 41(uint8) 42(uint8) type=060, len=015: "udhcp 0.9.9-pre" (string) type=061, len=007: 01:00:1b:fe:04:1d:c6 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.dhcpsrv/12781] DHCPSRV_CFGMGR_SUBNET4_ADDR selected subnet 192.168.2.0/24 for packet received by matching address 192.168.2.1 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.packets/12781] DHCP4_SUBNET_SELECTED [hwtype=1 00:1b:fe:04:1d:c6], cid=[01:00:1b:fe:04:1d:c6], tid=0x99722544: the subnet with ID 1001 was selected for client assignments 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.packets/12781] DHCP4_SUBNET_DATA [hwtype=1 00:1b:fe:04:1d:c6], cid=[01:00:1b:fe:04:1d:c6], tid=0x99722544: the selected subnet details: 192.168.2.0/24 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv4 reservation for subnet id 1001, identified by hwaddr=001BFE041DC6 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier: hwaddr=001BFE041DC6 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier hwaddr=001BFE041DC6, found 0 host(s) 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet id 1001 and identifier hwaddr=001BFE041DC6 2019-05-07 12:26:52.322 DEBUG [kea-dhcp4.hosts/12781] HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_IDENTIFIER get one host with IPv4 reservation for subnet id 1001, identified by hwaddr=001BFE041DC6 2019-05-07 12:26:52.323 DEBUG [kea-dhcp4.bad-packets/12781] DHCP4_PACKET_DROP_0007 [hwtype=1 00:1b:fe:04:1d:c6], cid=[01:00:1b:fe:04:1d:c6], tid=0x99722544: failed to process packet: DHCPv4 Option 43 is too big. 2019-05-07 12:26:53.351 DEBUG [kea-dhcp4.packets/12781] DHCP4_BUFFER_RECEIVED received buffer from 0.0.0.0:68 to 255.255.255.255:67 over interface net0p0 2019-05-07 12:26:53.351 DEBUG [kea-dhcp4.options/12781] DHCP4_BUFFER_UNPACK parsing buffer received from 0.0.0.0 to 255.255.255.255 over interface net0p0 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.dhcpsrv/12781] DHCPSRV_CFGMGR_SUBNET4_ADDR selected subnet 192.168.2.0/24 for packet received by matching address 192.168.2.1 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.packets/12781] DHCP4_SUBNET_SELECTED [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815: the subnet with ID 1001 was selected for client assignments 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.packets/12781] DHCP4_SUBNET_DATA [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815: the selected subnet details: 192.168.2.0/24 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.packets/12781] DHCP4_PACKET_RECEIVED [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815: DHCPDISCOVER (type 1) received from 0.0.0.0 to 255.255.255.255 on interface net0p0 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.packets/12781] DHCP4_QUERY_DATA [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815, packet details: local_address=255.255.255.255:67, remote_address=0.0.0.0:68, msg_type=DHCPDISCOVER (1), transid=0x1c017815, options: type=012, len=004: "apbr" (string) type=050, len=004: 192.168.2.7 (ipv4-address) type=053, len=001: 1 (uint8) type=055, len=009: 1(uint8) 3(uint8) 6(uint8) 12(uint8) 15(uint8) 28(uint8) 44(uint8) 46(uint8) 47(uint8) type=060, len=015: "udhcp 0.9.9-pre" (string) type=061, len=007: 01:c0:a0:bb:e5:0b:62 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.dhcpsrv/12781] DHCPSRV_CFGMGR_SUBNET4_ADDR selected subnet 192.168.2.0/24 for packet received by matching address 192.168.2.1 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.packets/12781] DHCP4_SUBNET_SELECTED [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815: the subnet with ID 1001 was selected for client assignments 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.packets/12781] DHCP4_SUBNET_DATA [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815: the selected subnet details: 192.168.2.0/24 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv4 reservation for subnet id 1001, identified by hwaddr=C0A0BBE50B62 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using identifier: hwaddr=C0A0BBE50B62 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier hwaddr=C0A0BBE50B62, found 0 host(s) 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.hosts/12781] HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet id 1001 and identifier hwaddr=C0A0BBE50B62 2019-05-07 12:26:53.352 DEBUG [kea-dhcp4.hosts/12781] HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_IDENTIFIER get one host with IPv4 reservation for subnet id 1001, identified by hwaddr=C0A0BBE50B62 2019-05-07 12:26:53.353 DEBUG [kea-dhcp4.bad-packets/12781] DHCP4_PACKET_DROP_0007 [hwtype=1 c0:a0:bb:e5:0b:62], cid=[01:c0:a0:bb:e5:0b:62], tid=0x1c017815: failed to process packet: DHCPv4 Option 43 is too big.
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