Huawei DR814Q 用户手册

User Manual 
Aolynk DR814Q ADSL2+ Broadband Router 

6  Troubleshooting

 

57 

1) 

The DNS server IP address specified on the PC is correct. If you specify the PC to 

obtain the DNS server address dynamically, verify with your ISP that the address 

configured on the DR814Q is correct, and then you can use the ping utility to test 

the connectivity with your ISP’s DNS server. 

2)  Generally, if a host can ping the Internet IP address, but cannot open the Web 

pages, the DNS server of the ISP is experiencing a failure temporarily. In this case, 

you can choose either of the following to solve the problem: Manually change your 

PC’s DNS IP address to the address of a normally functioning DNS server. Log 

into the Web page of the DR814Q and manually modify the configuration for DNS 

Relay (refer to section 4.2.2  “DNS Relay"), and then check by the nslookup 

command as instructed in section 6.2.2  “Nslookup”. 

Symptom 8: Fail to save the changes made on the Web-based configuration pages. 

Solution: Make sure that you click <Apply> to confirm every change you have made. 

After completing all the settings, enter the [Save Configuration] page to save them, thus 

making them take effect when the DR814Q is powered on next time. 

Symptom 9: You can visit most websites successfully, while access to some websites 

fails due to timeout. Configuring the DR814Q to operate in the bridge mode and your 

PC to establish a dialup connection can solve this problem. 

Solution: This may be caused by an over-high MTU value set on the router between 

the user end and the website. Usually you can set a small MTU value (1440, for 

example) on the detail setting page of the WAN service to avoid this problem. Refer to 

section 4.2.1  “WAN” for detailed operations. 

Symptom 10: Some services are unavailable once the firewall is enabled. 

Solution: As the firewall rules of the DR814Q are very strict, it is recommended 

someone familiar with the WAN services and router configuration enable the firewall 

and configure the firewall rules. Before the creation of firewall rules, you must be clear 

about the Internet service deployment. It is recommended that you disable the firewall. 

Use the ping command to check whether your PC can recognize other computers on 

the network. A ping command sends messages to the specified computer. If the 

computer receives the messages, it replies with the response message. Before using 

the command, you must know the IP address of the destination host with which your PC 

is trying to communicate.  

At the DOS prompt, enter the following command: 

If the destination host receives the packet, the command prompt window displays the 

contents as shown in Figure 6-1.