Common router faults and their solutions

For everyone in the process of using the router encountered problems, small series I think it is necessary to popularize some of the router's small knowledge, I believe that as long as you carefully read, you will suddenly see the internet is no longer difficult!!

One, WAN Port no connection

Two, the WAN Port has the connection, but the connection failed.

Third, broadband normal, you can ping, but unable to open the Web page

Wireless can not be connected, but wired connection is normal

V. Frequent drop of line

V. Installation of routers after the slow speed

Six, cannot obtain the IP address (cannot obtain the external network address, cannot obtain intranet address)

Vii. IP address conflict adjustment

Viii. VPN Connection

　　One, WAN Port no connection

A WAN port without connectivity is one of the most common failures to install a router, seemingly simple to handle, and may actually

No solution! There are several main scenarios in which a WAN is not connected:

1, the line did not pick up the correct! This is the most critical of the negligence! Sometimes routers on this side of the WAN port are plugged in, but not connected to the modem, LAN access is not connected to the wall modules.

2, network cable connectivity failure, mainly the quality of the network cable is poor, or the line sequence is not correct. Modem access to the router, usually the modem distance from the router is not far, as long as the line sequence is no problem, is very bad network cable can be normal connection. For LAN access to the broadband, it should be noted that if the corridor switch to the distance between the routers, the quality of the network must pass, otherwise it will be due to poor quality of the line can not connect! The instability of any one of these links may cause the WAN to not be able to connect! Therefore, for LAN access to the broadband router WAN port is not connected, must be slowly one step check.

3, the rate does not match. This is mainly for LAN access to the way broadband. Some ISPs cut corners, corridor switches to the desktop is limited to the speed of 10M, can not reach the 100M standard. At present, most normal routers do not support the 10M connection rate, so the WAN cannot connect because of the rate mismatch! In this case, you can find a small number of the market to support the 10M WAN port connectivity of the router test is clear.

4, the modem is not stable

This situation is rarely encountered, but it is difficult to judge correctly when confronted. The breakdown is as follows:

Modem alone connected to the computer can be normal dial-up Internet, ping value normal, connect the router, the router WAN port shows no connection, the replacement of all brand routers have no effect. Because the computer can be connected to the normal Internet, it often ignores the problems of the modem. In fact, the modem often has internal components damaged fault, mainly power supply capacitor slurry, resulting in power supply instability, so that the router connection failed! Replace the modem to solve the problem!

5. ISP Limit Port connection number

Once encountered a very typical case, the customer's home ran several times, replaced several routers, all show WAN Port connectionless, only send not accepted. The reason is that the ISP restricts the client line to only one terminal, so once the router is connected, a failure occurs. Solution: Complain to the ministry, or threaten to dismantle the machine, no longer use their broadband. It is difficult to deal with such a problem, you know, this is celestial!

6, line sequence is wrong

This is not the same as the line sequence of the top two, which is due to the error caused by the negligence of the line, and this is the line of the maintenance staff on purpose. A very small number of ISP's maintainers deliberately put the corridor switch out

The cable line in accordance with his own provisions of the do, so can not work under 100M, but can work under 10M, the problem comes out! The router that you bought outside because of this problem causes the WAN to be disconnected, and then call the maintainer, who says that as long as the computer is connected to the Internet, it has nothing to do with them.

The reality is that they are the maintenance of their own routers to the customer installation, before the installation of the first in the switch in accordance with the correct sequence of the connector, and then in the customer's home to do the crystal head, of course, is also in accordance with the correct approach, and then install the router, charging customers high I have encountered this fault two times, very troublesome.

　　Two, the WAN Port has the connection, but the connection failure

This failure is manifested in that the WAN port displays a connection, but the packet is sent without receiving, or is still not networked.

1. Broadband owed fee

2, the user name and password to lose the wrong

3, if the phone is bound, it is possible to bind the phone due to downtime, resulting in broadband followed by the network.

4, before the customer set their own routing error input broadband password, causing the router to use the wrong password frequently dialing, so that the ISP backstage lock account.

5, the ISP's access to the server instability failure, resulting in the account inexplicably automatically locked.

6, MAC address binding. Some ISPs have a binding policy for Mac addresses, so changing the NIC or adding a router detects a change in the MAC address and therefore does not return data. Encounter such a situation, first cloning the correct Mac, not yet, call the ISP's customer phone, let the other party in the background to refresh the data, and then you can adjust the router settings.

7, cable quality does not pass, send data and return data to a large range of packet loss or error packets, resulting in connection failure. Replace the crystal head and cable after testing again.

8, the telephone line attenuation is too big, causes the modem signal to be unstable, causes the router dialing to fail.

　　Second, broadband normal, you can ping the public network address, but could not open the Web page

Routers can connect to the broadband, the computer or mobile phone can also normal access to the router, but can not access the extranet. This is mainly because the DNS settings need to be adjusted.

1, mobile phone access to the extranet, the computer can not access: This situation indicates that the router has been working properly, but the computer network card needs to set the DNS server address, usually set to use the ISP's DNS server address, this is the most optimized scheme, but the actual application, Very few will encounter operator's DNS server unstable fault, this time can use other areas of public DNS, personal comparison recommended Google DNS, can be said to be speed and stability of both, 8.8.8.8 and 8.8.4.4.

2, mobile phone and computer can not access the extranet, but access to the router. This situation is mainly due to a problem with the DNS settings of the router, although the router will automatically obtain the DNS server address when it is connected to the public network, but in rare cases the acquisition failure will occur, resulting in terminal access failure. The processing method refers to the first article above.

3, the computer can access the extranet, mobile phones or flat panel can not access the extranet, the main situation is not a router fault, most of the time is limited by the router firewall. Please contact the Router administrator. Or the router resets to set.

4, operating system failure.

　　Wireless can not be connected, but wired connection is normal

1, router failure, especially wireless module failure, you can replace the router test.

2, notebook wireless card driver abnormal, reinstall drive.

3, can't find the signal, check the wireless switch.

4, laptop wireless card contact bad.

5, connect the signal always show is connected, one is a system problem, one is the wireless password error, especially the notebook, because the keyboard number keys and letter key status incorrectly led to input.

6, wireless router wireless SSID best not in Chinese.

7, the channel is disturbed by the outside, causes the connection to fail, may attempt to replace other channel test connection situation.

8, check the notebook at noon wireless network card properties and the consistency of the router, including encryption methods.

9, the lowest level of error, the wireless function in the router is not enabled!

　　V. Frequent drop of line

1, check whether the crystal head oxidation, whether loose off? LAN access check whether the connector is loose? is the line broken?

2, modem access, check the modem to the router between the network cable, as well as modem telephone line into the line, modem and the router's power adapter is reliable contact.

3. Is the router on an on-demand connection? This approach may be automatically disconnected after a period of inactivity.

4, the modem quality problems, resulting in frequent drop lines.

5, the quality of the router to ask back, resulting in frequent drop lines.

6, routers to the computer network between the connectivity and reliability of the cable. Including the reliability of the wall module. As well as the quality of network cable clearance. You can force the NIC to 10M to test to see if the line is falling frequently. Normally, the 100M Full-duplex mode should be guaranteed between the NIC and the router.

7, if the wireless frequent drop line, to check the wireless settings and there is no foreign interference.

8. The matching problem between the computer network card and the router.

9, if it is modem access, check the location of the separator whether the phone line and modem wiring is reversed, so that

The phone was disconnected when it rang.

10, in a complex network with multiple switches, there may be a switch to multiple connections leading to the loop, causing IP address Chong

Sudden and frequent drop of line.

11, each terminal may be more than one computer using the same IP address, or a computer poisoning generated ARP spoofing.

12, the celestial characteristic, limits the router.

　　Six, cannot obtain the IP address (cannot obtain the external network address, cannot obtain intranet address)

A, can not obtain the extranet address, this situation in fact is very common in the unit.

1, the line quality does not pass

2, set incorrect, especially the department intranet, particularly many. Mainly because their servers are basically shut down DHCP, manually assigned IP address, or even part of the manual address +mac binding way, since the new router up, must be unable to obtain IP address. and routers are usually the factory is dynamic IP.

3, to see whether the use of VPN connections, this is common in the enterprise sector, each store or branch office and headquarters between the majority of the use of VPN connections, and routers are not set, and even some routers do not support VPN connections.

4, the superior router or switch (often three layer switch) does not have DHCP enabled.

B, can not obtain intranet address

1, the line quality does not pass.

2, DHCP is not enabled, and the client does not manually specify the IP address according to the rules.

3, NIC and router do not match.

4, system failure.

　　Vii. IP address conflict adjustment

Now many ISPs give away the modem or light cat or wireless cat, with IP allocation, and often conflict with the router, For example, the modem is assigned to the terminal is 192.168.1.2, and the router's default gateway 192.168.1.1, this time there will be problems, you can change the router to 192.168.2.1, in short, no matter how to change, do not produce the same gateway address, according to the actual situation adjustment, here can not elaborate, or will Out of the book.