CN107360095B

CN107360095B - Method for realizing port forwarding in router based on client host name

Info

Publication number: CN107360095B
Application number: CN201710571662.8A
Authority: CN
Inventors: 周明森; 熊运自; 陈志凡; 陈宇科
Original assignee: Huizhou Gaoshengda Technology Co Ltd
Current assignee: Huizhou Gaoshengda Technology Co Ltd
Priority date: 2017-07-13
Filing date: 2017-07-13
Publication date: 2020-06-23
Anticipated expiration: 2037-07-13
Also published as: CN107360095A

Abstract

The invention discloses a method for realizing port forwarding in a router based on a client host name, which comprises the following steps: s1, the router establishes a background server to monitor the change of the list information of the client device; s2, the router lists the name of the client device according to the list information of the client device for the user to select, sets the forwarding port information, and sends the MAC address and the forwarding port information corresponding to the name of the client device to the background server; s3, the background server inquires the IP address of the client device according to the received MAC address of the client device, establishes a port forwarding list and stores the MAC address, the IP address and the forwarding port information of the client device; s4, establishing port forwarding rule according to IP address and forwarding port information in the port forwarding list, thereby realizing port forwarding of data information. The method of the invention can effectively reduce the workload of the network manager without paying attention to the change of the IP address of the client device and the modification of the device name in real time by the manager.

Description

Method for realizing port forwarding in router based on client host name

Technical Field

The invention relates to the technical field of computer networks, in particular to a method for realizing port forwarding in a router based on a client host name.

Background

At present, the internet of things is developing vigorously, but the IPV6 is not popularized and applied yet. In our country, IPV4 is still the main, and the IP public network address in IPV4 protocol cannot meet the requirement of the equipment in the existing internet of things. To solve this problem, a router is used, which basically meets the internet access requirements of the device, however, if a server is to be built in a lan device, it is not directly accessible in the wan and other lans, and it must be forwarded through the port of the router. As is well known, the port forwarding rules of routers today are based on the IP address of the client host for port forwarding. Therefore, the IP address of the client host must be obtained, and there are two methods for the existing devices in the local area network to obtain the IP address, one is dynamic DHCP allocation of the router, and the other is setting of static IP.

1. If the DHCP dynamically allocates the IP address, the IP address after each reboot of the device, and the reacquired IP after the DHCP lease expires may be different. If the server is accessed through port forwarding, the network administrator must update the IP address in port forwarding in time after each IP address change to properly access the server of the device. Obviously this approach is unreliable because it is not possible for the administrator to constantly be concerned with device IP address changes and also increases the workload of the administrator.

2. If the static IP address is set, the IP address of the equipment is fixed after the static IP address is set, so that the equipment can be correctly forwarded to the equipment through the port regardless of restarting the equipment. However, if a network segment of a router changes, the IP address of the device must also be reset. If the reset is forgotten, the IP address of the device will probably not belong to the same network segment as the router and will not be forwarded. If many devices exist in the local area network and each device needs port forwarding, each device needs to reset an IP address one by one, and one device is not missed, so that the setting is very complicated, the workload is large, and time and labor are wasted.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a method for realizing port forwarding in a router based on a client host name, an administrator does not need to pay attention to the change of an IP address of a client device and the modification of the name of the client device in real time, the workload of a network administrator can be effectively reduced, the method does not need to reset the IP addresses of a plurality of devices in a local area network, the workload is reduced, and the working efficiency is improved.

The purpose of the invention is realized by the following technical scheme:

the method for realizing the port forwarding in the router based on the client host name comprises the following steps:

s1, the router establishes a background server to monitor the change of the list information of the client device;

s2, the router lists the name of the client device according to the list information of the client device for the user to select, sets the forwarding port information, and sends the MAC address and the forwarding port information corresponding to the name of the client device to the background server;

s3, the background server inquires the IP address of the client device according to the received MAC address of the client device, establishes a port forwarding list and stores the MAC address, the IP address and the forwarding port information of the client device;

s4, establishing port forwarding rule according to IP address and forwarding port information in the port forwarding list, thereby realizing port forwarding of data information.

As a further preferable scheme, the step S2 includes the following steps:

s21, the browser requests a port forwarding setting page to an http server of the router;

s22, the http server embeds the client device list information into a port forwarding setting page and sends the port forwarding setting page to the browser;

s23, the browser provides a selection interface for a user to select the name of the client device and set forwarding port information, then the browser queries the MAC address of the client device according to the selected name of the client device, and sends the MAC address and the forwarding port of the client device to the http server;

and S24, the http server sends the forwarding port information and the MAC address to a background server of the router.

As a further preferable scheme, the step S23 further includes the following steps:

s231, entering a port forwarding page by the browser, and selecting a name of the client device;

s232, judging whether the number of the client devices is unique or not according to the client device information returned by the http server, and if so, executing the step S234; otherwise, go to step S233;

s233, popping up a dialog box, listing all MAC addresses corresponding to the selected client device name, and executing the step S235 after selecting which client device to specifically send to;

s234, inquiring the MAC address corresponding to the name of the client device, and executing the step S235;

s235, maintaining the MAC address and setting forwarding port information;

and S236, sending the MAC address and the forwarding port information to an http server.

As a further preferred scheme, the forwarding port information includes: start port information and end port information.

As a further preferable scheme, the client device list information includes a client device name, a client device MAC address, and a client device IP address.

As a further preferred scheme, the port forwarding list includes a MAC address of the client device, an IP address of the client device, forwarding start port information, and forwarding end port information.

As a further preferable scheme, the step S4 specifically includes: according to the IP address of the client device, the forwarding initial port information and the forwarding termination port information, a port forwarding rule is established through an iptables command, and therefore port forwarding of data information is achieved.

As a further preferable scheme, the method further comprises the step that the background server establishes a timed update task thread.

As a further preferred solution, the step of updating the task thread at regular time includes the steps of:

step A: presetting a first time threshold, and inquiring client equipment list information and port forwarding list information;

and B: judging whether the IP addresses of the same MAC address of the client device corresponding to the client device list and the port forwarding list are the same or not, if so, executing the step A; otherwise, executing step C;

and C: updating the IP address of the port forwarding list into the IP address in the client equipment list;

step D: deleting the original port forwarding rule through an iptables command, and establishing a new port forwarding rule;

step E: and adding the forwarding port information after updating the IP address to realize port forwarding of new data information.

More preferably, the first time threshold is 0.5s to 1.5 s.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the invention is a method for realizing port forwarding in a router based on the name of a client host, which monitors the change of list information of client equipment, including equipment addition and IP address updating, and establishes a port forwarding rule according to the equipment list information, thereby realizing the port forwarding of data information, solving the defect that the traditional port forwarding is used for dynamically acquiring IP addresses in a local area network, and being capable of effectively following the updating and forwarding of the IP addresses of the client equipment. Meanwhile, the port forwarding mode is realized according to the name of the client device, so that the operation for port forwarding is simplified, and the working efficiency of port forwarding is improved.

Drawings

FIG. 1 is a flow chart of a method for implementing port forwarding in a router based on a client host name according to the present invention;

FIG. 2 is a flowchart of step S2 of the method of the present invention;

FIG. 3 is a flowchart of step S23 of the method of the present invention;

FIG. 4 is a flowchart illustrating steps taken by a background server to establish a timed update task thread in accordance with the present invention;

fig. 5 is a schematic diagram of an implementation system of port forwarding in a router based on a client host name according to the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Examples

Referring to fig. 1, the present invention provides a method 10 for implementing port forwarding in a router based on a client host name, including the following steps:

Specifically, referring to fig. 2, the router setup daemon S monitors changes in the client device list T1, where the changes in the client device list T1 include device addition, IP address update, and the like. And designing a UI (user interface) interface by the router for a user to select a setting port for forwarding, and sending data to the background service program S. After receiving the data, the background service program S queries the client device list T1 to obtain the IP address of the device. The port forwarding list T2 is created to store the MAC address, IP address, forwarding start port and forwarding end port, and meanwhile, a port forwarding rule is created according to the iptables command.

The step S4 specifically includes: according to the IP address of the client device, the forwarding initial port information and the forwarding termination port information, a port forwarding rule is established through an iptables command, and therefore port forwarding of data information is achieved. It is noted that iptables is an IP packet filtering system integrated with the latest version 3.5 Linux kernel. If the Linux system is connected to the internet or a LAN, a server or a proxy server connecting the LAN and the internet, the system facilitates better control of IP packet filtering and firewall configuration on the Linux system. In the present invention, the iptables command is used to establish or delete a port forwarding rule.

Please refer to fig. 2 and fig. 3. The step S2 includes the steps of:

s21, the browser requests a port forwarding setting page from the http server.

S22, the http server embeds the client device list information into a port forwarding setting page and sends the port forwarding setting page to the browser.

S23, the browser inquires the MAC address of the client device according to the list information of the client device, sets forwarding port information and sends the forwarding port information to the http server; the step S23 further includes the steps of: s231, entering a port forwarding page by the browser, and selecting a name of the client device; s232, judging whether the number of the client devices is unique or not according to the client device information returned by the http server, and if so, executing the step S234; otherwise, go to step S233; s233, popping up a dialog box, listing all MAC addresses corresponding to the selected client device name, and executing the step S235 after selecting which client device to specifically send to; s234, inquiring the MAC address corresponding to the name of the client device, and executing the step S235; s235, maintaining the MAC address and setting forwarding port information; and S236, sending the MAC address and the forwarding port information to an http server.

Please refer to fig. 4. The method for realizing the port forwarding in the router based on the client host name also comprises the step that the background server establishes a timed updating task thread. The step of updating the task thread at regular time comprises the following steps:

step A: presetting a first time threshold, and inquiring the list information of the client equipment and the port forwarding list information. Note that the first time threshold is 0.5s to 1.5 s. Preferably, the first time threshold is 1 s.

And B: judging whether the IP addresses of the same MAC address of the client device corresponding to the client device list and the port forwarding list are the same or not, if so, executing the step A; otherwise, executing step C.

And C: and updating the IP address of the port forwarding list into the IP address in the client equipment list.

Step D: deleting the original port forwarding rule through an iptables command, and establishing a new port forwarding rule.

Specifically, the background service program S queries the port forwarding list T2 once in a timed and correlated manner, whether the IP address corresponding to the MAC address is consistent with the IP address corresponding to the same MAC address in the client device list T1, if not, it indicates that the client device list is updated, and then updates the port forwarding list T2 so that the IP address corresponding to the MAC address is consistent with that in the client device list T1, and deletes the originally established port forwarding rule, and adds the port forwarding rule again according to the current IP address, thereby implementing port forwarding of new data information.

The working mode is as follows: referring to fig. 5, the present invention establishes a background service program in the router for monitoring the change of the client device list. When the client device joins the local area network of the router, the client device list records the name, IP address, MAC address and other information of the device. The established backend server can then monitor this information. When the browser requests a port forwarding setting page interface from the http server, the http server embeds the client device list information into a port forwarding webpage and returns the port forwarding setting page information to the browser. The browser receives the information from the web page and the list of client devices so that the client device names can be listed for selection by the user.

When a user selects the name of the equipment to be forwarded to find out the MAC address, a forwarding starting port and a forwarding terminating port are set, finally, the MAC address, the forwarding starting port and the forwarding terminating port are submitted to the http server together, the http server receives the data and then sends the data to the background server in the form of a message, and after receiving the message, the background server can find out the corresponding IP address in the client equipment list through the MAC address. At this time, the MAC address, the IP address, the forwarding start port information, and the forwarding end port information of the client device to be forwarded are determined.

The iptables command sets information of a port forwarding required IP address, a forwarding starting port and a forwarding ending port, and the required information is provided at the moment, so that the iptables command is called to add a port forwarding rule, port forwarding is achieved, and meanwhile, the MAC address, the IP address, the forwarding starting port information and the forwarding ending port information are stored in a port forwarding list.

And a timing task thread is created in the background server, whether the MAC address in the port forwarding table is the same as the IP address corresponding to the same MAC in the client equipment list is inquired every 1 second, and if the difference indicates that the IP address in the client equipment list is updated, the IP address in the equipment list is updated to the port forwarding table. Meanwhile, the iptable is used for deleting the forwarding rule established before and re-adding the forwarding rule after the IP address is updated, so that the port forwarding can be correctly realized after the IP address of the client equipment is updated.

The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The method for realizing the port forwarding in the router based on the client host name is characterized by comprising the following steps:

s4, establishing a port forwarding rule according to the IP address and the forwarding port information in the port forwarding list, thereby realizing the port forwarding of the data information;

the step S2 includes the steps of:

2. The method for implementing port forwarding based on client host name in router according to claim 1, wherein said step S23 further includes the following steps:

s235, storing the MAC address and setting forwarding port information;

3. The method for implementing port forwarding based on client host name in router according to any of claims 1 and 2, wherein the forwarding port information includes: start port information and end port information.

4. The method of claim 1, wherein the client device list information comprises a client device name, a client device MAC address, and a client device IP address.

5. The method of claim 1, wherein the port forwarding list comprises a MAC address of a client device, an IP address of the client device, forwarding start port information, and forwarding end port information.

6. The method for implementing port forwarding in a router based on a client host name according to claim 5, wherein the step S4 specifically includes: according to the IP address of the client device, the forwarding initial port information and the forwarding termination port information, a port forwarding rule is established through an iptables command, and therefore port forwarding of data information is achieved.

7. The method of claim 1, further comprising the step of the backend server establishing a timed update task thread.

8. The method for implementing port forwarding based on client host name in router according to claim 7, wherein the step of updating task thread periodically comprises the steps of:

9. The method of claim 8, wherein the first time threshold is 0.5s to 1.5 s.