04-07-2020 06:37 PM
I have setup 2 routers, and one is acting as a IPV6 DHCP server and other as a client. Client receiving ipv6 address but unable to ping the server. Please advice where I am wrong.
DHCP Router Current running config as following
============================================================================================
DHCP#show run
Building configuration...
Current configuration : 774 bytes
!
version 15.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname DHCP
!
!
!
!
!
!
!
!
ip cef
ipv6 unicast-routing
!
no ipv6 cef
!
ipv6 dhcp pool STATEFUL_POOL
address prefix 2000::/64 lifetime 172800 86400
dns-server 2000::1
domain-name sunny.com
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0/0
no ip address
duplex auto
speed auto
ipv6 nd ra suppress
ipv6 address 2000::1/64
ipv6 dhcp server STATEFUL_POOL
!
interface GigabitEthernet0/0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
!
!
end
Client Running Config as following
================================================================================================
DHCP#show run
Building configuration...
Current configuration : 774 bytes
!
version 15.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname DHCP
!
!
!
!
!
!
!
!
ip cef
ipv6 unicast-routing
!
no ipv6 cef
!
ipv6 dhcp pool STATEFUL_POOL
address prefix 2000::/64 lifetime 172800 86400
dns-server 2000::1
domain-name sunny.com
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0/0
no ip address
duplex auto
speed auto
ipv6 nd ra suppress
ipv6 address 2000::1/64
ipv6 dhcp server STATEFUL_POOL
!
interface GigabitEthernet0/0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
!
!
end
Client information as following
============================================================================================
CLIENT#show ipv6 int bri
GigabitEthernet0/0 [up/up]
FE80::2D0:BAFF:FE9E:C101
2000::2025:9E7A:386:4DD9
GigabitEthernet0/1 [administratively down/down]
unassigned
GigabitEthernet0/2 [administratively down/down]
unassigned
Vlan1 [administratively down/down]
unassigned
CLIENT#show ipv6 int gi 0/0
GigabitEthernet0/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::2D0:BAFF:FE9E:C101
No Virtual link-local address(es):
Global unicast address(es):
2000::2025:9E7A:386:4DD9, subnet is 2000::2025:9E7A:386:4DD9/128 [CAL/PRE]
Joined group address(es):
FF02::1
FF02::1:FF86:4DD9
FF02::1:FF9E:C101
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
CLIENT#ping 2000::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2000::1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
============================================================================================
DHCP Server interface configuration as following
DHCP#show ipv6 interface bri
GigabitEthernet0/0/0 [up/up]
FE80::201:97FF:FE04:2C01
2000::1
GigabitEthernet0/0/1 [administratively down/down]
unassigned
Vlan1 [administratively down/down]
unassigned
DHCP#show ipv6 interface bri
GigabitEthernet0/0/0 [up/up]
FE80::201:97FF:FE04:2C01
2000::1
GigabitEthernet0/0/1 [administratively down/down]
unassigned
Vlan1 [administratively down/down]
unassigned
Able to ping itself
DHCP#ping 2000::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2000::1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/7 ms
04-07-2020 06:55 PM
04-08-2020 07:14 AM
Hi,
1. Remove this command "ipv6 nd ra suppress".
2. Shutdown the ports, server and client, unshut the ports.
3. After the DHCP client gets an IPv6 address, try again IP connectivity. If it doesn't work, try to connectivity between the link-local addresses and post the output of "show ipv6 neighbors" from both devices.
Regards,
Cristian Matei.
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