TWI392290B - Router and method of setting ip addresses of the router - Google Patents

Description

Router and its IP address setting method

The invention relates to a network device and a network construction method, in particular to a router and an IP address setting method thereof.

A router is used to connect multiple logically separated networks on different network segments. So-called logically separate networks of different network segments represent a single network or subnet. When data is transferred from one subnet to another, it can be done through the router.

There are two types of ports on most routers, namely Wide Area Network (WAN) and Local Area Network (LAN). The WAN port is used to connect to external networks, such as ADSL (Asymmetric Digital Subscriber Line) data machines (also known as modems), optical fibers, and other access lines. The LAN port is used to connect to the internal network, and is mainly connected to a switch, a hub or a personal computer (PC) in the LAN.

Usually, many users' PCs connect to a modem through a router and then connect to the Internet. In general, routers and modems have built-in private IP (Internet Protocol) addresses provided by device manufacturers. The private IP address of the router and modem can be modified. In actual use, it is necessary to connect the WAN of the router to the LAN of the data machine, connect the LAN port of the router to each PC, and connect the telephone line of the data machine to the Internet through the telephone line. The line of the data machine uses the static or dynamic public network provided by the network operator. There is an IP address, and the LAN of the modem uses its built-in private IP address. The LAN address of the data plane's LAN port can be used to form a LAN path including a router and each PC. The IP address used by the router WAN requires user settings. The LAN port of the router can use its built-in private IP address. To properly connect to the Internet, the IP address of the router's WAN port needs to be on the same network segment as the IP address used by the modem's LAN port and on the different network segment used by the router's LAN port.

At present, when managing data machines and routers, users need to log in to the data machine and router one by one, and modify and set their IP addresses one by one, which undoubtedly causes great trouble to the user.

In view of the above, it is necessary to propose a router and its IP address setting method, which can automatically set the IP address of the router WAN埠 and LAN埠.

A router IP address setting method for setting a WAN port and a LAN port IP address of a router connected to the data machine according to a private IP address of a data machine connected to the network. The method includes: broadcasting a DHCP DISCOVER packet upward; receiving a DHCP OFFER packet sent by the data machine when the DHCP DISCOVER packet is received by the data machine; parsing the private IP address of the data machine according to the received DHCP OFFER packet And setting the router's WAN埠IP address according to the parsed private IP address of the data machine to be in the same network segment as the private IP address of the above data machine, and setting the IP address of the router's LAN port, so that It is on a different network segment than the private IP address of the above data machine.

A router that is connected to a network through a modem. The router includes an IP address search module for broadcasting DHCP upwards. a DISCOVER packet; a data packet receiving module, configured to receive a DHCP OFFER packet sent by the data machine when receiving the response of the data machine to the DHCP DISCOVER packet; and an IP address resolution module, configured to receive the DHCP according to the foregoing The OFFER packet parses out the private IP address of the data machine; the IP address setting module is used to set the IP address of the router's WAN port according to the private IP address of the data machine to make it with the private IP address of the above data machine. In the same network segment, and set the IP address of the router's LAN port to be on a different network segment than the private IP address of the above data machine.

Compared with the prior art, the router provided by the present invention and its IP address setting method can automatically detect the private IP address of the data machine, and automatically set the WAN and LAN of the router according to the private IP address of the data machine. The IP address is very convenient for the user.

Referring to Figure 1, a hardware architecture diagram of a personal computer connected to a network using a router and a data machine. A plurality of personal computers 3 are connected to a local area network (LAN) 埠 21 of the router 2. The Wide Area Network (WAN) 埠 20 of the router 2 is connected to the LAN 埠 11 of the data machine 1. The telephone line 10 of the data set 1 is connected to the network 4 via a telephone line. The data machine 1 may be an ADSL (Asymmetric Digital Subscriber Loop) data machine. The network 4 can be the internet.

Referring to FIG. 2, it is a functional block diagram of the router 2 in the preferred embodiment of the router of the present invention. The function module of the router 2 includes an IP address search module 22, a determination module 23, a data packet receiving module 24, an IP address resolution module 25, an IP address setting module 26, and a list obtaining module 27. And IP address verification Certificate module 28. Each of the modules is a program segment that performs a specific function, and is more suitable for describing the execution process of the software in the computer than the software program itself. Therefore, the description of the software program in the present invention is described by a module.

The above router 2 further includes a storage unit 29. A storage list of IP addresses is stored in the storage unit 29. The IP address list includes the IP addresses commonly used by the LAN 11 of the data machine 1. The commonly used IP addresses include, but are not limited to, 192.168.1.1, 192.168.2.1, 192.168.1.254, 10.0.0.1, 172.16.2254.1.

The IP address search module 22 is configured to broadcast a DHCP (Dynamic Host Configuration Protocol) DISCOVER packet to the uplink. The uplink refers to information transmission by the UE to the network direction. The DHCP DISCOVER packet may include a source address of 0.0.0.0, a destination address of 255.255.255.255, and a MAC (Media Access Control) address of the router 2. When Router 2 connects to the network through the data machine 1 for the first time, it does not know which network it belongs to, that is, it does not know the IP address of the LAN port 11 of the data machine 1, so it broadcasts the DHCP DISCOVER packet. The IP address of the LAN port 11 of the data machine 1 is interrogated.

The determining module 23 is configured to determine whether the DHCP DISCOVER packet has received a response from the data machine 1, and determine whether the number of times the DHCP DISCOVER packet is broadcast exceeds a preset value without receiving a response from the data machine 1. After the router 2 broadcasts the first DHCP DISCOVER packet, if the response of the data machine 1 is not obtained within the specified time, the router 2 broadcasts multiple times according to the preset value. The preset value may be 4 times. If you have not received a response from modem 1, router 2 An error message will be displayed, indicating that the DHCP DISCOVER failed.

The data packet receiving module 24 is configured to receive the DHCP OFFER packet sent by the data machine 1 when receiving the response of the data machine 1. The DHCP OFFER packet includes the IP address of the LAN port 11 of the data machine 1.

The IP address resolution module 25 is configured to parse the IP address of the LAN port 11 of the data machine 1 according to the received DHCP OFFER packet.

The IP address setting module 26 is configured to set the IP address of the WAN port 20 of the router 2 to the LAN port 11 of the data machine 1 according to the IP address of the LAN port 11 of the parsed data machine 1 described above. The IP address is in the same network segment, and the IP address of the LAN port 21 of the router 2 is set to be in a different network segment from the IP address of the LAN port 11 of the data machine 1.

The list obtaining module 27 is configured to obtain the IP address list in the storage unit 29 when the response of the data machine 1 is not received after the number of times the DHCP DISCOVER packet is broadcasted exceeds the preset value.

The IP address verification module 28 is configured to send a plurality of ARP (Address Resolution Protocol) packets to the uplink, and verify whether the IP address in the IP address list is the LAN of the data machine 1 one by one. 11 IP address. Each ARP includes an IP address in an IP address list. Sending an ARP packet to the upstream device can query whether the LAN port 11 of the data machine 1 uses the IP address in the ARP packet. The IP address verification module 28 is further configured to determine whether an ARP packet has received a reply from the data machine 1, and when the data machine 1 receives a reply to an ARP packet, determine the LAN of the data machine 1. The IP address of 11 is the IP address in the ARP packet. The IP address verification module 28 is also used to receive the data machine 1 When replying to any ARP packet, it is assumed that the IP address of the LAN port 11 of the data machine 1 is a default IP address.

The IP address setting module 26 is further configured to set the IP address of the WAN port 20 of the router 2 to the LAN of the data machine 1 according to the IP address of the LAN 埠 11 of the determined or assumed data machine 1 described above. The IP address of 埠11 is in the same network segment, and the IP address of the LAN 埠21 of the router 2 is set to be in a different network segment from the IP address of the LAN 埠11 of the data machine 1.

Referring to FIG. 3, it is a flowchart of a method of a preferred embodiment of the IP address setting method of the router 2 of the present invention.

In step S10, the IP address search module 22 broadcasts a DHCP DISCOVER packet upward. The DHCP DISCOVER packet may include a source address of 0.0.0.0, a destination address of 255.255.255.255, and a MAC address of the router 2.

In step S11, the determining module 23 determines whether the DHCP DISCOVER packet has received a response from the data machine 1. If the response from the data machine 1 is not obtained, the flow advances to step S15. Otherwise, if a response from the data machine 1 is obtained, the flow advances to step S12.

In step S12, the packet receiving module 24 receives the DHCP OFFER packet sent by the data machine 1. The DHCP OFFER packet includes the IP address of the LAN port 11 of the data machine 1.

In step S13, the IP address resolution module 25 parses the IP address of the LAN port 11 of the data machine 1 based on the received DHCP OFFER packet.

Step S14, the IP address setting module 26 is based on the parsed data machine. The IP address of the LAN port 11 of 1 sets the IP address of the WAN port 20 of the router 2 so that it is in the same network segment as the IP address of the LAN port 11 of the data machine 1, and sets the IP address of the LAN port 21 of the router 2. The address is placed on a different network segment than the IP address of the LAN port 11 of the data machine 1.

In step S15, the determining module 23 further determines whether the number of times the DHCP DISCOVER packet is broadcast exceeds a preset value. The preset value may be 4 times. If the preset value is not exceeded, the flow returns to step S10 to broadcast the DHCP DISCOVER packet again. Otherwise, if the preset value is exceeded, the flow proceeds to step S16.

In step S16, the list acquisition module 27 acquires the IP address list in the storage unit 29. As described above, the IP address list includes the IP address commonly used by the LAN 11 of the data machine 1. The commonly used IP addresses include, but are not limited to, 192.168.1.1, 192.168.2.1, 192.168.1.254, 10.0.0.1, 172.16.2254.1.

In step S17, the IP address verification module 28 sends a plurality of ARP packets to the uplink, and verifies whether the IP address in the IP address list is the IP address of the LAN port 11 of the data machine 1 one by one. Each of the ARP packets includes an IP address in the IP address list.

In step S18, the IP address verification module 28 further determines whether a certain ARP packet has received a reply from the data machine 1. If an ARP packet receives a reply from the data machine 1, the flow advances to step S19. Otherwise, when the reply of the data machine 1 to any one of the ARP packets is not received, the flow advances to step S20.

In step S19, the IP address verification module 28 determines the LAN of the data machine 1. The IP address of 11 is the IP address in the ARP packet.

In step S20, the IP address verification module 28 assumes that the IP address of the LAN 埠 II of the data machine 1 is a default IP address.

In step S14, the IP address setting module 26 sets the IP address of the WAN port 20 of the router 2 to the LAN of the data machine 1 based on the IP address of the LAN port 11 of the determined or assumed data machine 1 described above. The private IP address of the port 11 is in the same network segment, and the IP address of the LAN port 21 of the router 2 is set to be in a different network segment from the IP address of the LAN port 11 of the data machine 1.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

1‧‧‧Data machine

10‧‧‧ telephone line

11‧‧‧ LAN port

2‧‧‧ router

20‧‧‧ wide area network port

21‧‧‧ LAN port

22‧‧‧IP address search module

23‧‧‧Judgement module

24‧‧‧ Packet Receiver Module

25‧‧‧IP address resolution module

26‧‧‧IP address setting module

27‧‧‧List Acquisition Module

28‧‧‧IP address verification module

29‧‧‧Storage unit

3‧‧‧Computer 1~N

4‧‧‧Network

Figure 1 is a hardware architecture diagram of a PC and a modem to connect a personal computer to the network.

2 is a functional block diagram of a router in a preferred embodiment of the router of the present invention.

3 is a flow chart of a method for a preferred embodiment of a router IP address setting method of the present invention.

2‧‧‧ router

22‧‧‧IP address search module

23‧‧‧Judgement module

24‧‧‧ Packet Receiver Module

25‧‧‧IP address resolution module

26‧‧‧IP address setting module

27‧‧‧List Acquisition Module

28‧‧‧IP address verification module

29‧‧‧Storage unit

Claims (8)

A router IP address setting method, which sets a wide area network of a router connected to the data machine and an IP address of a local area network router according to a private IP address of the data machine connected to the network, including: a router Broadcasting a DHCP DISCOVER packet to the upstream; receiving a DHCP OFFER packet sent by the data machine when the DHCP DISCOVER packet is received by the data machine; parsing the private IP address of the data machine according to the received DHCP OFFER packet; setting the router The WAN IP address is in the same network segment as the private IP address of the data machine, and the IP address of the LAN path of the router is set to be in a different network segment from the private IP address of the data machine; After the router broadcasts the DHCP DISCOVER packet more than a preset value and still does not receive a response from the data machine, it obtains a list of IP addresses stored in the router; the router sends multiple ARP packets to the uplink, wherein each ARP packet Include an IP address in the IP address list; when an ARP packet gets a reply from the data machine, determine the private I of the data machine The P address is the IP address in the ARP packet; and the IP address of the router's WAN is set to be in the same network segment as the private IP address of the determined data machine, and the router's local area network is set. The IP address is on a different network segment than the private IP address of the data machine identified above. The method for setting a router IP address according to the first aspect of the patent application, wherein the IP address in the IP address list includes: 192.168.1.1, 192.168.2.1, 192.168.1.254, 10.0.0.1, and 172.16.254.1. The method for setting the IP address of the router according to Item 1 of the patent application includes: when the reply of the data machine to any ARP packet is not received, the private IP address of the data machine is assumed to be a default IP address. Address; and set the IP address of the router's WAN to be in the same network segment as the hypothetical data machine's private IP address, and set the IP address of the router's LAN path to make the above assumptions The private IP address of the modem is on a different network segment. A router is connected to a network through a data machine, the router includes: an IP address search module for broadcasting a DHCP DISCOVER packet upward; and a data packet receiving module, configured to receive the DHCP when receiving the data machine The response of the DISCOVER packet is received by the DHCP OFFER packet sent by the data machine; the IP address resolution module is configured to parse the private IP address of the data machine according to the received DHCP OFFER packet; the list obtaining module is used when Obtaining an IP address list stored in the router when the number of times the DHCP DISCOVER packet is broadcast exceeds a preset value, and the IP address verification module is configured to send multiple ARPs to the uplink. The packet, wherein each ARP packet includes an IP address in the IP address list to verify whether the IP address in the IP address list is a private IP address of the data machine one by one; and the IP address setting mode Group, used to set the path based on the private IP address of the modem The IP address of the WAN of the router is in the same network segment as the private IP address of the above data machine, and the IP address of the router's LAN path is set to be the private IP address of the above data machine. On different network segments. The router of claim 4, further comprising: a determining module, configured to determine whether the DHCP DISCOVER packet has received a response from the data machine, and determine to broadcast the DHCP DISCOVER packet without receiving a response from the data machine. Whether the number of times exceeds the preset value. The router of claim 5, further comprising: a storage unit, configured to store the IP address list including multiple IP addresses. The router according to claim 6, wherein the IP address in the IP address list includes: 192.168.1.1, 192.168.2.1, 192.168.1.254, 10.0.0.1, and 172.16.254.1. The router of claim 4, wherein when an ARP packet receives a reply from the data machine, the IP address verification module determines that the IP address in the ARP packet is a private IP address of the data machine. The address, and if no ARP packet is received by the modem, the IP address verification module assumes that the private IP address of the modem is a default IP address.