[Kea-users] DHCP4_PACKET_SEND_FAIL sendmsg() returned with an error: No route to host

Brian Hechinger wonko at 4amlunch.net
Mon May 11 20:04:44 UTC 2020


I'm trying to setup Kea here and I'm having a bit of trouble.


Setup is a Cisco Nexus 3132Q-V setup as a DHCP relay shipping requests 
off to Kea. Kea is configured to use a pgsql database.


Kea server: 10.42.1.11

Cisco: 10.42.3.1 (Also 10.42.1.1 as it's the core)


 From the attached log you can see that Kea receives the request but 
fails to send the response claiming no route to host. It's trying to 
send the response back to the relay which I can in fact ping from the 
kea server. Watching packet capture on the switch it doesn't even 
attempt to send the packet at all.


What am I missing here that it can't send the response?


[root at dhcp1 log]# ping -c 1 10.42.3.1
PING 10.42.3.1 (10.42.3.1) 56(84) bytes of data.
64 bytes from 10.42.3.1: icmp_seq=1 ttl=255 time=0.343 ms

--- 10.42.3.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.343/0.343/0.343/0.000 ms
[root at dhcp1 log]#


2020-05-11 19:54:00.344 DEBUG [kea-dhcp4.packets/12756] 
DHCP4_BUFFER_RECEIVED received buffer from 10.42.3.1:67 to 10.42.1.11:67 
over interface dhcp1
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.options/12756] 
DHCP4_BUFFER_UNPACK parsing buffer received from 10.42.3.1 to 10.42.1.11 
over interface dhcp1
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.packets/12756] 
DHCP4_PACKET_RECEIVED [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: DHCPDISCOVER (type 1) 
received from 10.42.3.1 to 10.42.1.11 on interface dhcp1
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.packets/12756] DHCP4_QUERY_DATA 
[hwtype=1 a8:20:66:25:d5:ca], cid=[01:a8:20:66:25:d5:ca], 
tid=0xbff6ccb9, packet details: local_address=10.42.1.11:67, 
remote_address=10.42.3.1:67, msg_type=DHCPDISCOVER (1), transid=0xbff6ccb9,
options:
   type=012, len=014: "BrianHechinger" (string)
   type=051, len=004: 7776000 (uint32)
   type=053, len=001: 1 (uint8)
   type=055, len=010: 1(uint8) 121(uint8) 3(uint8) 6(uint8) 15(uint8) 
119(uint8) 252(uint8) 95(uint8) 44(uint8) 46(uint8)
   type=057, len=002: 1500 (uint16)
   type=061, len=007: 01:a8:20:66:25:d5:ca
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.dhcpsrv/12756] 
DHCPSRV_CFGMGR_SUBNET4_ADDR selected subnet 10.42.3.0/24 for packet 
received by matching address 10.42.3.1
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.packets/12756] 
DHCP4_SUBNET_SELECTED [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: the subnet with ID 423 was 
selected for client assignments
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.packets/12756] 
DHCP4_SUBNET_DATA [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: the selected subnet details: 
10.42.3.0/24
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv4 
reservation for subnet id 423, identified by hwaddr=A8206625D5CA
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using 
identifier: hwaddr=A8206625D5CA
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier hwaddr=A8206625D5CA, 
found 0 host(s)
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet 
id 423 and identifier hwaddr=A8206625D5CA
2020-05-11 19:54:00.345 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_IDENTIFIER get one host with IPv4 
reservation for subnet id 423, identified by hwaddr=A8206625D5CA
2020-05-11 19:54:00.349 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_IDENTIFIER_NULL host not found using 
subnet id 423 and identifier hwaddr=A8206625D5CA
2020-05-11 19:54:00.349 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER get one host with IPv4 
reservation for subnet id 423, identified by client-id=01A8206625D5CA
2020-05-11 19:54:00.350 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ALL_IDENTIFIER get all hosts with reservations using 
identifier: client-id=01A8206625D5CA
2020-05-11 19:54:00.350 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ALL_IDENTIFIER_COUNT using identifier 
client-id=01A8206625D5CA, found 0 host(s)
2020-05-11 19:54:00.350 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ONE_SUBNET_ID_IDENTIFIER_NULL host not found using subnet 
id 423 and identifier client-id=01A8206625D5CA
2020-05-11 19:54:00.350 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_IDENTIFIER get one host with IPv4 
reservation for subnet id 423, identified by client-id=01A8206625D5CA
2020-05-11 19:54:00.352 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_IDENTIFIER_NULL host not found using 
subnet id 423 and identifier client-id=01A8206625D5CA
2020-05-11 19:54:00.352 DEBUG [kea-dhcp4.dhcp4/12756] 
DHCP4_CLASS_ASSIGNED [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: client packet has been 
assigned to the following class(es): UNKNOWN
2020-05-11 19:54:00.352 DEBUG [kea-dhcp4.dhcp4/12756] 
DHCP4_CLASS_ASSIGNED [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: client packet has been 
assigned to the following class(es): ALL, UNKNOWN
2020-05-11 19:54:00.352 DEBUG [kea-dhcp4.ddns/12756] 
DHCP4_CLIENT_HOSTNAME_PROCESS [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: processing client's Hostname 
option
2020-05-11 19:54:00.352 DEBUG [kea-dhcp4.ddns/12756] 
DHCP4_CLIENT_HOSTNAME_DATA [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: client sent Hostname option: 
BrianHechinger
2020-05-11 19:54:00.352 DEBUG [kea-dhcp4.ddns/12756] 
DHCP4_CLIENT_HOSTNAME_DATA [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: client sent Hostname option: 
BrianHechinger
2020-05-11 19:54:00.353 DEBUG [kea-dhcp4.ddns/12756] 
DHCP4_RESPONSE_HOSTNAME_DATA [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: including Hostname option in 
the server's response: brianhechinger
2020-05-11 19:54:00.353 DEBUG [kea-dhcp4.dhcpsrv/12756] 
DHCPSRV_PGSQL_GET_CLIENTID obtaining IPv4 leases for client ID 
01:a8:20:66:25:d5:ca
2020-05-11 19:54:00.354 DEBUG [kea-dhcp4.dhcpsrv/12756] 
DHCPSRV_PGSQL_GET_HWADDR obtaining IPv4 leases for hardware address 
hwtype=1 a8:20:66:25:d5:ca
2020-05-11 19:54:00.357 DEBUG [kea-dhcp4.alloc-engine/12756] 
ALLOC_ENGINE_V4_OFFER_NEW_LEASE allocation engine will try to offer new 
lease to the client [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9
2020-05-11 19:54:00.357 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4 get one host with reservation for 
subnet id 423 and IPv4 address 10.42.3.137
2020-05-11 19:54:00.357 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ALL_ADDRESS4 get all hosts with reservations for IPv4 
address 10.42.3.137
2020-05-11 19:54:00.357 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ALL_ADDRESS4_COUNT using address 10.42.3.137, found 0 host(s)
2020-05-11 19:54:00.357 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_CFG_GET_ONE_SUBNET_ID_ADDRESS4_NULL host not found using subnet id 
423 and address 10.42.3.137
2020-05-11 19:54:00.357 DEBUG [kea-dhcp4.hosts/12756] 
HOSTS_MGR_ALTERNATE_GET4_SUBNET_ID_ADDRESS4 trying alternate sources for 
host using subnet id 423 and address 10.42.3.137
2020-05-11 19:54:00.360 DEBUG [kea-dhcp4.dhcpsrv/12756] 
DHCPSRV_PGSQL_GET_ADDR4 obtaining IPv4 lease for address 10.42.3.137
2020-05-11 19:54:00.362 DEBUG [kea-dhcp4.dhcpsrv/12756] 
DHCPSRV_PGSQL_GET_ADDR4 obtaining IPv4 lease for address 10.42.3.137
2020-05-11 19:54:00.363 INFO  [kea-dhcp4.leases/12756] 
DHCP4_LEASE_ADVERT [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: lease 10.42.3.137 will be 
advertised
2020-05-11 19:54:00.363 DEBUG [kea-dhcp4.options/12756] 
DHCP4_PACKET_PACK [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: preparing on-wire format of 
the packet to be sent
2020-05-11 19:54:00.363 DEBUG [kea-dhcp4.packets/12756] 
DHCP4_PACKET_SEND [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: trying to send packet 
DHCPOFFER (type 2) from 10.42.1.11:67 to 10.42.3.1:67 on interface dhcp1
2020-05-11 19:54:00.363 DEBUG [kea-dhcp4.packets/12756] 
DHCP4_RESPONSE_DATA [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: responding with packet 
DHCPOFFER (type 2), packet details: local_address=10.42.1.11:67, 
remote_address=10.42.3.1:67, msg_type=DHCPOFFER (2), transid=0xbff6ccb9,
options:
   type=001, len=004: 4294967040 (uint32)
   type=003, len=004: 10.42.1.1
   type=006, len=008: 8.8.8.8 8.8.4.4
   type=012, len=014: "brianhechinger" (string)
   type=015, len=012: "4amlunch.net" (string)
   type=051, len=004: 4000 (uint32)
   type=053, len=001: 2 (uint8)
   type=054, len=004: 10.42.1.11
   type=058, len=004: 2000 (uint32)
   type=059, len=004: 3500 (uint32)
   type=061, len=007: 01:a8:20:66:25:d5:ca
   type=119, len=043: "4amlunch.net." (fqdn) 
"wonko.home.cns.4amlunch.net." (fqdn)
2020-05-11 19:54:00.364 ERROR [kea-dhcp4.packets/12756] 
DHCP4_PACKET_SEND_FAIL [hwtype=1 a8:20:66:25:d5:ca], 
cid=[01:a8:20:66:25:d5:ca], tid=0xbff6ccb9: failed to send DHCPv4 
packet: pkt4 send failed: sendmsg() returned  with an error: No route to 
host




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