[Kea-users] Multiple relay servers - problem

[Marcin Romanowski]

Please, anybody any hint?
I moved my configuration to GNS3 to check configuration, according to
documentation I removed shared-networks to subnet4.
Now I have one relay's agent which has two interfaces with different
subnets. On both subnet I have client with the same mac address "service
computer". I want when client connects to one subnet get address from that
subnet, when connects to other subnet get address from other subnet. Common
thing is the same mac address

*kea-dhcp4.config*
{
  "Dhcp4": {
    .....
    "subnet4": [

      {
        "subnet":"192.168.0.0/24",
        "relay": {
          "ip-addresses": [ "10.249.1.202" ]
      },
        "pools": [],
        "reservations": [
          {
            "hw-address": "0C:F4:65:FE:0A:00",
            "ip-address": "192.168.0.11"
          }
        ]
      },
      {
        "subnet":"10.10.10.0/24",
        "relay": {
          "ip-addresses": [ "10.249.1.202" ]
      },
        "pools": [],
        "reservations": [
          {
            "hw-address": "0C:F4:65:FE:0A:00",
            "ip-address": "10.10.10.3"
          }
        ]
      }

    ]
  }
}

*The relay's agent configuration*
ip dhcp-relay information option server-override
ip dhcp relay information option vpn
ip dhcp relay information trust-all
no ip dhcp ping packets
!
interface GigabitEthernet8
 ip address 10.10.10.1 255.255.255.0
 ip helper-address 10.249.1.203
!
interface GigabitEthernet9
 ip address 192.168.0.1 255.255.255.0
 ip helper-address 10.249.1.203


With this configurations I always get address from the first declared
subnet :(
Now, when I turn on clinet on gi8 (from network 10.10.10.0/24) kea offers
address from first declared subnet :(

21:03:19.984354 IP (tos 0x0, ttl 255, id 201, offset 0, flags [none], proto
UDP (17), length 328)
    10.249.1.202.67 > 10.249.1.203.67: [udp sum ok] BOOTP/DHCP, Request
from 0c:f4:65:fe:0a:00, length 300, hops 1, xid 0x23416254, Flags
[Broadcast] (0x8000)
 Gateway-IP 10.249.1.202
 Client-Ethernet-Address 0c:f4:65:fe:0a:00
 Vendor-rfc1048 Extensions
   Magic Cookie 0x63825363
   DHCP-Message Option 53, length 1: Discover
   Parameter-Request Option 55, length 8:
     Subnet-Mask, Classless-Static-Route, Default-Gateway, Static-Route
     Domain-Name-Server, NTP, Option 138, Vendor-Option
   Hostname Option 12, length 8: "MikroTik"
   Client-ID Option 61, length 7: ether 0c:f4:65:fe:0a:00
   Agent-Information Option 82, length 12:
     Unknown SubOption 150, length 4:
0x0000:  0a0a 0a00
     Unknown SubOption 152, length 4:
0x0000:  0a0a 0a01
   END Option 255, length 0
   PAD Option 0, length 0, occurs 13
21:03:19.986686 IP (tos 0x0, ttl 64, id 28210, offset 0, flags [DF], proto
UDP (17), length 336)
    10.249.1.203.67 > 10.249.1.202.67: [bad udp cksum 0x1ad4 -> 0xebf9!]
BOOTP/DHCP, Reply, length 308, hops 1, xid 0x23416254, Flags [Broadcast]
(0x8000)
 *Your-IP 192.168.0.11 <-- this should offer 10.10.10.3*
 Gateway-IP 10.249.1.202
 Client-Ethernet-Address 0c:f4:65:fe:0a:00
 Vendor-rfc1048 Extensions
   Magic Cookie 0x63825363
   DHCP-Message Option 53, length 1: Offer
   Subnet-Mask Option 1, length 4: 255.255.255.0
   Domain-Name-Server Option 6, length 8: 8.8.8.8,4.4.4.4
   Hostname Option 12, length 8: "mikrotik"
   Lease-Time Option 51, length 4: 3600
   Server-ID Option 54, length 4: 10.249.1.203
   RN Option 58, length 4: 1000
   RB Option 59, length 4: 2000
   Agent-Information Option 82, length 12:
     Unknown SubOption 150, length 4:
0x0000:  0a0a 0a00
     Unknown SubOption 152, length 4:
0x0000:  0a0a 0a01
   END Option 255, length 0



Please help with configuration.

Best Regards
Marcin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/kea-users/attachments/20200805/8c0ee17a/attachment.htm>