Justin Bail Justin.Bail at smithville.com
Wed Jul 24 19:03:22 UTC 2019

Setup: Ubuntu server 18.04.2 Kea 1.4.0-P1

We are migrating our subnets from isc dhcp to kea dhcp.  We thought we had everything ironed out then this came up.

We get these messages in kea_dhcp.log


kea_dhcp 2019-07-24 14:57:37.878 ERROR [kea-dhcp4.packets/23825] DHCP4_PACKET_PROCESS_STD_EXCEPTION exception occurred during packet processing: failed to parse an option '1' holding string value - empty value is not accepted


We found this in the messages doc but didn't find specific information to troubleshoot it.

We changed logging to debug with no luck in capturing anything else about the discover.

We are only seeing these issues so far when something sends option 60 information. Specifically Meraki devices.  We are not doing anything with option 60 in our config.

The mac address of the device does not appear in the logs which makes troubleshooting harder.  I did get the discover in a tcp dump from one of the affected devices.  That packet is below with our information and the customer's redacted.

13:37:41.755777 IP (tos 0x0, ttl 254, id 14712, offset 0, flags [none], proto UDP (17), length 382)
    gatewayaddress.bootps > harpy.bootps: [udp sum ok] BOOTP/DHCP, Request from customer's mac address (oui Unknown), length 354, hops 1, xid 0x54ef0604, Flags [none] (0x0000)
          Gateway-IP the subnet's gateway here
          Client-Ethernet-Address e0:cb:bc:bc:92:34 (oui Unknown)
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Discover
            Client-ID Option 61, length 7: ether customer's mac
            Hostname Option 12, length 22: "customer gear"
            Vendor-Class Option 60, length 6: "MERAKI"
            Vendor-Option Option 43, length 3: 1.0.255
            Parameter-Request Option 55, length 7:
              Subnet-Mask, Domain-Name, Default-Gateway, BR
              Hostname, Domain-Name-Server, MTU
            Agent-Information Option 82, length 48:
              Circuit-ID SubOption 1, length 32: **********
              Remote-ID SubOption 2, length 12: **************
            END Option 255, length 0
            SS Option 16, length 0
            PAD Option 0, length 0, occurs 2|[rfc1048]

Justin Bail
Systems Engineer
Office:  (812) 935-2429
Justin.Bail at smithville.com  |  smithville.com<http://www.smithville.com/>


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