DNS update disabled Check the configuration

3. Troubleshooting Functional Failures in Operation

Figure 3-10: Troubleshooting for DHCP Server Failure with DNS Cooperation

<DNS update disabled>

Check the configuration.

Verify if there is a failure occurrence using the show logging command and the show ip interface command.

No failure on this

No failure on this system

system

(Multiple devices exist

A failure occurred on

(Connected directly)

between DNS server and

this system

DHCP server.)

Verify the failure occurrence on other devices.

No failure on other devices

See the manuals "Message Log Reference"

Verify the setting information of filter

and "3.6.1 Communication Is Disabled or Is

and QoS.

Disconnected" and perform the actions

described in [Action] associated with each log

message.

(a) Checking configuration

This failure may be caused by the incorrect DNS update on Dynamic DNS due to the DHCP server errors or the conflict with the settings on the DNS server. The followings are the steps to check the configuration:

1.First, check the method for permitting DNS update on the DNS server. For access permission with an IP address/ network, see No. 3 and later. For permission with an authentication key, see No. 2 and later.

2.Confirm that the key information and authentication key specified on the DNS server are equivalent to the key information set in the DHCP server configuration (see the manual "Configuration Commands").

3.Confirm that the zone information specified on the DNS server is equivalent to the zone information in the DHCP server configuration (see the manual "Configuration Commands"). In this case, confirm that both forward lookup and reverse lookup are set.

4.Confirm that DNS update is defined (see the manual "Configuration Commands"). Since the DNS update is disabled by default, this setting is required to update DNS.

5.Confirm that the domain name used by the client matches the domain name registered on the DNS server. When distributing the domain name by DHCP, confirm that it is correctly set in the configuration (see "Configuration Commands" and "Operation Commands").

(b)Checking time information

When the authentication key is being used for DNS update, the difference in time between this system and the DNS server should be within 5 minutes as the UTC time in most cases. Use the show clock command to check the time information on this system and synchronize the time information referring to "Configuration Commands" and "Operation Commands," as required.

(c)Checking the log message and interface

As one of the causes for disabled communication to the DNS server, communication between the DNS server and DHCP server has been disabled. Check the log message displayed on this system or the interface up/down status using the show ip interface command. For the procedure, see "3.6.1 Communication Is Disabled or Is Disconnected."

IP8800/S6700, IP8800/S3600, IP8800/S6600, IP8800/S6300, IP8800/S2400 specifications

The NEC IP8800 series comprises a range of advanced networking solutions designed for various applications ranging from enterprise networking to service provider environments. This series includes models such as the IP8800/S2400, IP8800/S3600, IP8800/S6300, IP8800/S6600, and IP8800/S6700, each with its unique set of features and capabilities aimed at delivering robust performance, security, and scalability.

The IP8800/S2400 is an entry-level switch tailored for small to medium enterprises. It features a compact design and high port density, making it ideal for network edge applications. The model supports both Layer 2 and Layer 3 switching capabilities, enabling efficient traffic management. With its robust security features, including access control lists and support for VLANs, the IP8800/S2400 ensures secure connectivity.

Moving to the IP8800/S3600, this switch is designed for data center environments and offers high throughput with advanced routing capabilities. It is equipped with high-capacity 10G and 40G Ethernet ports, facilitating faster data transfer rates. The S3600 supports various protocols such as MPLS and Segment Routing, enhancing its ability to manage complex network architectures. Its energy-efficient design also helps reduce operational costs.

The IP8800/S6300 is tailored for high-performance networking scenarios, featuring a flexible architecture that supports both traditional and cloud-based services. With extensive QoS capabilities, the S6300 optimizes traffic flow and manages bandwidth efficiently, ensuring high-quality service delivery. Its virtualization support allows for easier integration into modern, software-defined networking environments.

The IP8800/S6600 provides a comprehensive solution for service providers and large enterprises, boasting high scalability and modularity. This model supports advanced features such as network slicing and the ability to handle high-density 100G interfaces. Its robust management tools, including centralized control and automation capabilities, simplify network operations significantly.

Finally, the IP8800/S6700 represents the pinnacle of the series, designed for mission-critical applications requiring the utmost reliability and performance. It supports advanced analytics, AI-driven insights, and comprehensive telemetry, enabling proactive network management. With high availability features and extensive redundancy options, the S6700 ensures continuous operation, making it ideal for core network functions.

In summary, the NEC IP8800 series offers a versatile range of switches that combine advanced technologies, high performance, and robust security features, catering to various networking needs across different industries. Each model is designed to provide not only superior connectivity but also the flexibility and scalability required in today’s fast-paced digital landscape.

NEC IP8800/S3600, IP8800/S6600, IP8800/S2400 DNS update disabled Check the configuration, System

Models: IP8800/S6700 IP8800/S3600 IP8800/S6600 IP8800/S6300 IP8800/S2400