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3. Troubleshooting Functional Failures in Operation
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1. Log in to the system.
2. Execute show ipv6 route command to check the route information acquired by this system.
3. For IP8800/S6700, IP8800/S6600, and IP8800/S6300, check to see if packets are discarded because of the Null
interface. If the route information sending interface resulting a communication failure is null0, packets are discarded
because of the Null interface. Review the setting conditions for the static routing function in the configuration.
4. Go to "3.9 IPv6 Network Communication Failure" if the route information on the failed interface is missing in the
route information acquired by this system or if the next hop address is invalid.
5. If the route information acquired by this system contains the route information on the failed interface, the following
functions set for the interface may have problem. Check these functions.
• RA function
Go to "(7)Checking RA setting information."
(6) Checking filtering/QoS setting information
Certain packets may have been discarded by filtering, or packets may have been discarded through bandwidth
monitoring, discarding control, or shaper of the QoS control.
Review if the conditions of filtering and QoS control in the configuration have been set up correctly and if bandwidth
monitoring, discarding control, or shaper has been set up appropriately for system operation in system configuration.
For the procedure, see "3.23.1 Checking Filtering/QoS Setting Information."
(7) Checking RA setting information
If communication is not possible between this system and the terminal directly connected to this system, address
information is not properly distributed by RA. Confirm that the RA function is set correctly in the configuration. Use
the following procedure:
1. Log in to the system.
2. Execute the command show ipv6 route and check the RA information of this system.
3. If IPv6 address information is distributed properly, following function that is configured on the failed interface may
have problem. Check these functions.
• Filtering/QoS function
See "(8)Checking filtering/QoS setting information."
3.9.2 IPv6 DHCP Troubleshooting
(1) Configuration is not distributed
When using the prefix distribution feature of IPv6DHCP server in this system, the following five items are possible
causes of service malfunction.
1. The client count is greater than the number of prefix that can be distributed.
2. The client DUID (DHCP Unique Identifier) is not correctly specified.
3. The "ipv6 dhcp server" setting is not correct.
4. Failure during IPv6DHCP operation
5. Other failures
The above problems can be isolated by determining the location of the failure using the following procedure.