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Netmart
Beginner

IPv6 DHCP: Matching pool cannot be found

Hello, 

I was wondering, if someone could please take a look at the attached config including logs.

Basically, I wanted to set up a simple dhcpv6  topology:

dhcpv6 RTR----Relay----Client.

 

For some reason client does not receive DHPCv6 address. At dhcpc6 router the following message is captured: IPv6 DHCP: Matching pool cannot be found

 

Please advise.

 

Thanks.

2 REPLIES 2
Harold Ritter
Cisco Employee

Here's a few things you should change in the config.

 

Server:

You should have a pool that correspond to the link address of the router interface facing the client (2001:db8:200::1)

 

ipv6 dhcp pool NET200
address prefix 2001:DB8:200::/64
dns-server 2001:DB8:ABCD::1
dns-server 2001:DB8:ABCD::2
domain-name njit.com

 

Client:

- You do not need ipv6 address autoconfig, unless you need to acquire an address via SLAAC as well as DHCP. Only dhcp should be sufficient.

- If you want to simulate a host on the client, you should remove "ipv6  unicast-routing", which turns the client into a router.

- Do you really need prefix delegation (PD)? If so, you need to configure a prefix delegation pool on the server. If not, remove the "ipv6 dhcp client pd NET100" from the client.

 

Regards, 

 

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Netmart
Beginner

Thank you Harald.

Following your suggestion, it seems that DHCP server is now assigning IPv6 address:

 

DHCPv6 setup:

login on-success log
ipv6 unicast-routing
ipv6 dhcp pool NET100
address prefix 2001:DB8:100::/64
link-address 2001:DB8:200::1/64
dns-server 2001:DB8:ABCD::1
dns-server 2001:DB8:ABCD::2
domain-name cisco.com


interface GigabitEthernet1
no ip address
negotiation auto
ipv6 address 2001:DB8:23::3/64
ipv6 enable
ipv6 dhcp server
no mop enabled
no mop sysid

------------------------------

DHCPserver#sh ipv6 dhcp binding
Client: FE80::E78:7AFF:FE65:6F00
DUID: 00030001001EE56F0700
Username : unassigned
VRF : default
IA NA: IA ID 0x00070001, T1 43200, T2 69120
Address: 2001:DB8:100:0:ECD2:9AF0:B9EA:A63A
preferred lifetime 86400, valid lifetime 172800
expires at Apr 26 2020 02:48 AM (172627 seconds)
DHCPserver#

 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 

lient2#debug ipv6 dhcp
IPv6 DHCP debugging is on
Client2#
*Apr 24 02:33:36.315: IPv6 DHCP: Sending SOLICIT to FF02::1:2 src FE80::E78:7AFF:FE65:6F00 on GigabitEthernet1
*Apr 24 02:33:36.325: IPv6 DHCP: Received ADVERTISE message
*Apr 24 02:33:36.325: IPv6 DHCP: Received ADVERTISE from FE80::E78:7AFF:FE33:BF00 on GigabitEthernet1
*Apr 24 02:33:36.325: IPv6 DHCP: Adding server FE80::E78:7AFF:FE33:BF00
*Apr 24 02:33:36.325: IPv6 DHCP: Sending REQUEST to FF02::1:2 src FE80::E78:7AFF:FE65:6F00 on GigabitEthernet1
*Apr 24 02:33:36.331: IPv6 DHCP: Received REPLY message
*Apr 24 02:33:36.331: IPv6 DHCP: Received REPLY from FE80::E78:7AFF:FE33:BF00 on GigabitEthernet1
*Apr 24 02:33:36.332: IPv6 DHCP: Processing options
*Apr 24 02:33:36.332: IPv6 DHCP: Adding address 2001:DB8:100:0:ECD2:9AF0:B9EA:A63A/128 to GigabitEthernet1
*Apr 24 02:33:36.336: IPv6 DHCP: T1 set to expire in 43200 seconds
*Apr 24 02:33:36.336: IPv6 DHCP: T2 set to expire in 69120 seconds
*Apr 24 02:33:36.336: IPv6 DHCP: Configuring DNS server 2001:DB8:ABCD::1
*Apr 24 02:33:36.344: IPv6 DHCP: Table ID: 0 and VRF_name:
*Apr 24 02:33:36.344: IPv6 DHCP: Configuring DNS server 2001:DB8:ABCD::2
*Apr 24 02:33:36.344: IPv6 DHCP: Table ID: 0 and VRF_name:
*Apr 24 02:33:36.344: IPv6 DHCP: Configuring domain name njit.com
*Apr 24 02:33:36.344: IPv6 DHCP: DHCPv6 address changes state from REQUEST to OPEN (ADDR_REPLY_RECEIVED) on GigabitEthernet1
*Apr 24 02:33:37.861: IPv6 DHCP: Sending SOLICIT to FF02::1:2 src FE80::E78:7AFF:FE65:6F00 on GigabitEthernet1
*Apr 24 02:33:37.873: IPv6 DHCP: Received ADVERTISE message
*Apr 24 02:33:37.873: IPv6 DHCP: Received ADVERTISE from FE80::E78:7AFF:FE33:BF00 on GigabitEthernet1
*Apr 24 02:33:37.873: IPv6 DHCP: Received NoPrefixAvail - ignoring
*Apr 24 02:33:37.874: IPv6 DHCP: Discarding message due to parse error
*Apr 24 02:33:37.874: IPv6 DHCP: Removing server FE80::E78:7AFF:FE33:BF00
*Apr 24 02:34:07.796: IPv6 DHCP: Sending SOLICIT to FF02::1:2 src FE80::E78:7AFF:FE65:6F00 on GigabitEthernet1
*Apr 24 02:34:07.808: IPv6 DHCP: Received ADVERTISE message
*Apr 24 02:34:07.808: IPv6 DHCP: Received ADVERTISE from FE80::E78:7AFF:FE33:BF00 on GigabitEthernet1
*Apr 24 02:34:07.808: IPv6 DHCP: Received NoPrefixAvail - ignoring
*Apr 24 02:34:07.808: IPv6 DHCP: Discarding message due to parse error
*Apr 24 02:34:07.808: IPv6 DHCP: Removing server FE80::E78:7AFF:FE33:BF00
*Apr 24 02:34:37.352: IPv6 DHCP: Reached max retransimission count 10
*Apr 24 02:34:37.353: IPv6 DHCP: DHCPv6 changes state from SOLICIT to IDLE (TIMEOUT) on GigabitEthernet1.

 

 

Client2#sh ipv6 interface
GigabitEthernet1 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::E78:7AFF:FE65:6F00
No Virtual link-local address(es):
Description: Connected to DHCPrelay
Stateless address autoconfig enabled
Global unicast address(es):
2001:DB8:100:0:ECD2:9AF0:B9EA:A63A, subnet is 2001:DB8:100:0:ECD2:9AF0:B9EA:A63A/128
2001:DB8:200:0:E78:7AFF:FE65:6F00, subnet is 2001:DB8:200::/64 [EUI/CAL/PRE]
valid lifetime 2591925 preferred lifetime 604725
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF65:6F00
FF02::1:FFEA:A63A
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ICMP unreachables are sent
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds (using 30000)
ND advertised reachable time is 0 (unspecified)
ND advertised retransmit interval is 0 (unspecified)
ND router advertisements are sent every 200 seconds
ND router advertisements live for 1800 seconds
ND advertised default router preference is Medium
Hosts use stateless autoconfig for addresses.

 

Regards,

 

netmart

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