WO2011009319A1

WO2011009319A1 - Method for transmitting data frame between host and host in local area network

Info

Publication number: WO2011009319A1
Application number: PCT/CN2010/072388
Authority: WO
Inventors: 王光辉; 谢大; 田野
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-07-24
Filing date: 2010-04-30
Publication date: 2011-01-27
Also published as: CN101616160A

Abstract

A host in a local area network is provided, which comprises a Maximum Transmission Unit (MTU) notification module, for transmitting MTU information of this host to a receiver host via a message transceiver module prior to data frame transmission, and transmitting the MTU, which is returned by the receiver host and received by the message transceiver module, to a IP fragmentation module as the basic for IP fragmentation of this host. A method for transmitting data frames between hosts is also provided.

Description

Method for transmitting data frame between host and host in local area network

Technical field

The present invention relates to the field of local area networks, and in particular, to a method for transmitting data frames between a host and a host in a computer network. Background technique

In a local area network, the default transmission of the Maximum Transmission Unit (MTU) (such as 1500 bytes) is usually used when transmitting data frames between hosts. For data frames whose length exceeds the default MTU, Internet Protocol will be caused. Internet Protocol, IP) fragmentation. When the MTUs in the LAN can allow a larger MTU than the default MTU, if the default MTU is continued, the data frames whose data frame length is smaller than the allowable MTU allowed between hosts but larger than the default MTU will also be fragmented. This results in a decrease in the efficiency of network data transmission. Summary of the invention

The technical problem to be solved by the present invention is to provide a method for transmitting data frames between a host and a machine, which effectively improves the efficiency of network data transmission.

In order to solve the above problem, the present invention provides a host in a local area network, including an IP fragmentation module, a packet transceiver module, and an MTU advertisement module.

The MTU advertisement module is configured to: send, by the packet transceiver module, the MTU information of the host to the receiving host before transmitting the data frame, and return the MTU returned by the receiving host received by the packet transceiver module. The IP fragmentation module is sent to the IP fragment of the host.

The above host also has the following characteristics:

The packet sending and receiving module is configured to: send and receive an address resolution protocol packet, where the address resolution protocol packet carries the information of the MTU, where the address resolution protocol packet includes an address resolution protocol request message and an address resolution protocol response. " ^艮文.

The above host also has the following characteristics:

The MTU advertisement module is configured to: add n bytes in the address resolution protocol packet The MTU field of the length is used to fill in the information of the MTU of the host, where the MTU field is located at the end of the ARP packet padding byte, where n is an integer in [1, 18].

The above host also has the following characteristics:

The MTU advertisement module is configured to: if the MTU of the host is not equal to a default MTU, fill the MTU value of the host in the MTU field; if the MTU of the host is equal to a default MTU, the MTU field Set to 0 or fill in the default MTU value in the MTU field.

The above host also has the following characteristics:

The MTU advertisement module is configured to: set the MTU field to 0 when the host does not open the advertising MTU function or does not have the advertising MTU function.

The above host also has the following characteristics:

The host further includes: an MTU advertisement module, configured to: send, before the data frame is transmitted, the MTU information of the host to the receiving host by using the packet sending and receiving module, and receive the information received by the packet transceiver module The MTU returned by the receiving host is sent to the IP fragmentation module as the basis for the host IP fragmentation.

In order to solve the above problem, the present invention further provides a host, where the host is a host in a local area network, including an IP fragmentation module, a packet transceiver module, and an MTU negotiation module;

The MTU negotiation module is configured to: after receiving the MTU information sent by the sending host, the packet sending and receiving module compares the MTU of the sending host with the MTU of the host, and sends the smaller MTU to the packet. The IP fragmentation module serves as the basis for the host IP fragmentation, and sends the smaller MTU information to the sender host through the packet transceiver module. The above host also has the following characteristics:

The packet sending and receiving module is configured to: send and receive an address resolution protocol packet, where the address resolution protocol packet carries the information of the MTU, where the address resolution protocol packet includes an address resolution protocol request message and an address resolution protocol response. " ^艮文. The above host also has the following characteristics:

The MTU negotiation module is configured to: add an MTU field of n bytes in the address resolution protocol packet, and fill in the information about the smaller MTU, where the MTU field is located. The end of the ARP packet is padded with bytes, where n is an integer in [1, 18]. The above host also has the following characteristics:

The MTU negotiation module is configured to: if the smaller MTU is not equal to a default MTU, fill the MTU field with the smaller MTU value; if the smaller MTU is equal to a default MTU, The MTU field is set to 0 or the default MTU value is filled in the MTU field.

In order to solve the above problem, the present invention also provides a method for transmitting a data frame between hosts, which is applied to a local area network, including,

The transmitting host sends the MTU information of the sending host to the receiving host before transmitting the data frame;

After receiving the information of the MTU sent by the sending host, the receiving host compares the MTU of the sending host with the MTU of the receiving host, and uses the smaller MTU as the receiving host. The basis of the IP fragment, and sending the information of the smaller MTU to the sender host;

The sender host sends the smaller MTU sent by the receiving host as the basis of the local IP fragment of the sending end.

The above notification method also has the following characteristics:

Sending, by the sending host, the information of the MTU of the sending host to the receiving host, and the step of the receiving host sending the information of the smaller MTU to the sending host, where the host uses the address Parsing the protocol message to send the information of the MTU, the address resolution protocol>3⁄4 text includes an address resolution protocol request>3⁄4 text and an address resolution protocol response "^ text.

The above notification method also has the following characteristics:

The step of the host sending the MTU information by using the address resolution protocol packet includes: adding an MTU field of n bytes in the address resolution protocol packet, and filling in the MTU information of the host, where The MTU field is located at the end of the ARP packet padding byte, where n is an integer in [1, 18].

The above notification method also has the following characteristics:

The step of the host sending the information of the MTU by using an address resolution protocol packet further includes: If the MTU is not equal to the default MTU, the MTU value of the host is filled in the MTU field; if the MTU of the host is equal to a default MTU, the MTU field is set to 0 or at the MTU Fill in the field with the default MTU value.

The above notification method also has the following characteristics:

The step of the host sending the MTU information by using the address resolution protocol packet further includes: setting the MTU field to 0 when the host does not enable the advertising MTU function or does not have the advertising MTU function.

By advertising the MTU between the hosts of the above computer network, the host directly sends data frames with a length greater than the default MTU when the system transmits the data frame, without IP fragmentation, effectively improving the network data. The efficiency of the transfer. BRIEF abstract

Figure 1 shows the ARP packet structure in the prior art;

2 is an ARP packet structure in which an MTU field is added in an embodiment of the present invention;

FIG. 3 is a flow chart of an announcement MTU in an application example of the present invention. Preferred embodiment of the invention

The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Embodiment 1:

Before the data frame is officially transmitted between the LAN hosts, the Address Resolution Protocol (ARP) must be sent (including the ARP request message and the ARP response message) to know the hardware address of the peer host. The ARP packet structure currently used is as shown in Figure 1. The field used for ARP request or response is only 28 bytes, plus the Ethernet frame header is 14 bytes. There are only 42 bytes in total, due to Ethernet. The minimum packet length is 60 bytes. Therefore, you need to add 18 padding bytes to the end of the ARP packet to achieve the minimum packet length of the Ethernet.

In this embodiment, by extending the ARP ^ 艮 text, the MTU is announced between the LAN hosts. The function of the information makes the hosts know each other's MTUs.

When an ARP packet is extended, including the extension of the ARP request packet and the extension of the ARP reply packet, the following may be: Selecting n bytes in the ARP packet as the MTU field to notify the local device. MTU information, the MTU field may be located at any position of the ARP ^ , text, where n is an integer in [1, 18]; preferably, n bytes in the padding byte at the end of the ARP message are used as the MTU field, The MTU field may be located at the head or the end of the padding byte or in the middle of the padding byte. In this embodiment, n=4, and the header of the padding byte is selected as the MTU field. In this embodiment, the ARP report of the MTU field is added. The structure of the text is shown in Figure 2.

When the host uses the extended ARP packet, the host that sends the ARP request packet fills in the MTU field of the MTU to be advertised by the host. The receiving host also fills in the ARP reply packet with the MTU to be advertised by the responding host. information. Specifically, the following steps are included:

Step 1: When the sending host sends an ARP request packet, it writes the ARP request packet to the MTU information of the sending host.

Some sender hosts may not need to advertise the MTU information of the local end. For example, if the MTU of the host is equal to the default MTU of the system or the MTU function is not enabled for the host, or the host does not have the MTU function, the sender host can report the ARP request. The MTU field in the text is set to 0, indicating that the MTU of the sending host is the default value;

Step 2: After receiving the ARP request packet, the receiving host compares the MTU of the local MTU with the sending host, and uses the smaller MTU as the basis of the receiving host IP fragment, and adds the MTU information. Go to the MTU field in the ARP reply message;

In another embodiment, if the smaller MTU is equal to the default MTU after the receiving host is compared, the MTU of the ARP response message may also be set to 0. If the receiving end finds that the MTU field in the ARP request packet is 0, the default MTU is used, and the MTU is also set to 0 in the ARP reply message.

Step 3: After receiving the ARP reply packet, the sending host uses the MTU in the ARP reply packet as the basis of the IP fragment.

If the MTU field in the ARP reply message is 0, the default MTU is used. In this paper, the default MTU is unified between the hosts, that is, the MTU specified by the LAN system to be applied. Such as 1500 bytes.

The ARP transceiver module and the IP fragmentation module, in particular, further include:

The MTU advertisement module is configured to send the MTU information of the host to the receiving host through the ARP transceiver module before transmitting the data frame, and send the MTU returned by the receiving host received by the ARP transceiver module to the IP fragment module as the local The basis of the host IP fragmentation; or

The MTU negotiation module is configured to compare the MTU of the sending host with the MTU of the host after the ARP transceiver module receives the MTU information sent by the sending host, and use the smaller MTU as the host IP. The basis of the slice, and the information of the smaller MTU is sent to the sender host through the ARP transceiver module.

When an MTU is advertised, ARP packets can be used in the LAN, or other methods can be used, such as sending a MTU with a separate message to implement the advertisement, or adding it to other messages. However, the ARP packet selected in this embodiment is preferred because the ARP packet cost is small.

An application example of applying the above embodiment to the main control board and the service board of the communication device will be described in detail below.

When the service board of a communication device (for example, the MTU is 4096 bytes) is downloaded from the main control board (for example, the MTU is 8192 bytes), the MTU notification mode is used to increase the download rate. The flow chart for the MTU notification includes the following steps:

Step 310: The main control board sends an ARP request packet to the service board to notify the main control board.

The MTU is 8192 bytes;

Step 320: When receiving the ARP request, the service board compares the 8192 bytes MTU advertised by the master board with the 4096-byte MTU of the local machine, and takes the smaller value of the two, that is, 4096 bytes as the current current. The MTU used for communication. And adding the MTU (4096 bytes) to the ARP response packet; Step 330: After receiving the ARP response, the main control board uses the 4096-byte MTU advertised by the service board as the MTU of the current communication of the local device;

Step 340. When the downloading program is provided to the service board, the main control board performs IP fragmentation on the data frame exceeding 4096 bytes. Step 350. The service board communicates with the main control board, and performs IP fragmentation on the data frame exceeding 4096 bytes.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

By advertising the MTU between the hosts of the above computer network, the host directly sends data frames with a length greater than the default MTU when the system transmits the data frame, without IP fragmentation, effectively improving the network data. The efficiency of the transfer.

Claims

Claim

1. A host in a local area network, comprising an internet protocol (IP) fragmentation module, a message transceiver module, and a maximum transmission unit (MTU) notification module;

2. The host according to claim 1, wherein

The packet sending and receiving module is configured to: send and receive an address resolution protocol packet, where the address resolution protocol packet carries the information of the MTU, where the address resolution protocol packet includes an address resolution protocol request message and address resolution The protocol responds with 4 texts.

3. The host of claim 2, wherein

The MTU advertisement module is configured to: add an MTU field of n bytes in length to the address resolution protocol packet, and use the information of the MTU of the host, where the MTU field is located in the address resolution protocol. The end of the text is padded with bytes, where n is an integer in [1,18].

4. The host of claim 3, wherein

5. The host according to claim 3 or 4, wherein

6. The host of claim 1, wherein the host further comprises:

The MTU negotiation module is configured to: after receiving the MTU information sent by the sending host, the packet sending and receiving module compares the MTU of the sending host with the MTU of the host, and sends the smaller MTU to the The IP fragmentation module serves as the basis for the host IP fragmentation, and sends the smaller MTU information to the sender host through the packet transceiver module.

7. A host in a local area network, comprising an internet protocol (IP) fragmentation module, a message transceiver module, and a maximum transmission unit (MTU) negotiation module;

The MTU negotiation module is configured to: after receiving the MTU information sent by the sending host, the packet sending and receiving module compares the MTU of the sending host with the MTU of the host, and sends the smaller MTU to the packet. The IP fragmentation module serves as the basis for the host IP fragmentation, and sends the smaller MTU information to the sender host through the packet transceiver module.

8. The host of claim 7, wherein

9. The host of claim 8, wherein

The MTU negotiation module is configured to: add an MTU field of length n bytes in the address resolution protocol packet, and fill in the information about the smaller MTU, where the MTU field is located in the address resolution protocol. The end of the message is padded with bytes, where n is an integer in [1,18].

10. The host of claim 9, wherein

A method for transmitting a data frame between hosts, which is applied to a local area network, comprising: sending, by the transmitting end host, information about a maximum transmission unit (MTU) of the transmitting host to the receiving host before transmitting the data frame;

After receiving the information of the MTU sent by the sending host, the receiving host compares the MTU of the sending host with the MTU of the receiving host, and uses the smaller MTU as the receiving host. The basis of the Internet Protocol (IP) fragmentation, and transmitting the information of the smaller MTU to the sender host;

The sender host sends the smaller MTU sent by the receiver host as the local The basis for sending the local IP fragment.

12. The method of claim 11 wherein

Sending, by the sending host, the information of the MTU of the sending host to the receiving host, and the step of the receiving host sending the information of the smaller MTU to the sending host, where the host uses the address The information of the MTU is sent by the protocol protocol packet, where the address resolution protocol packet includes an address resolution protocol request packet and an address resolution protocol response packet.

13. The method of claim 12, wherein

The step of the host sending the MTU information by using the address resolution protocol packet includes: adding an MTU field of n bytes in the address resolution protocol packet, and filling in the MTU information of the host, where The MTU field is located at the end of the address resolution protocol message padding byte, where n is an integer in [1, 18].

14. The method of claim 13 wherein

The step of the host sending the information of the MTU by using an address resolution protocol packet further includes: if the MTU is not equal to the default MTU, filling in the MTU value of the host in the MTU field; When the MTU is equal to the default MTU, the MTU field is set to 0 or the default MTU value is filled in the MTU field.

15. The method of claim 13 or 14, wherein