Method and apparatus for detecting number of mobile host computers

Abstract

Belonging to area of network monitoring, the invention discloses method for detecting quantity of active host. The method includes steps: setting up monitor list in monitor equipment; updating the monitor list based on data packet of passing through the said monitor equipment; determining quantity of active host based on the monitor list. The invention also discloses equipment of detecting quantity of active host behind network address conversion equipment. The said detection equipment includes monitor equipment, monitor list setup in monitor equipment, module for updating monitor list, and module for determining quantity of active host. The invention is in use for making statistics of quantity of active host behind diversified network equipment. Comparing with prior art, the invention possesses advantages of simple method and shorter time needed.

Description

technical field

[0001] The invention relates to the field of network monitoring, in particular to a method and device for detecting the number of active hosts. Background technique

[0002] In the era when the IP protocol was originally designed, due to the limited number of devices that can be interconnected, the length of the IP address was defined as 32 bits. However, with the rapid development of the Internet, address resources are consumed rapidly. In order to cope with the IP addresses that are about to be exhausted, the Network Address Translation (NAT-Network Address Translate) technology is introduced.

[0003] This technology maps private network address information to public network address information, so that internal users can communicate with the outside world without obtaining public network addresses, which greatly alleviates the shortage of public network IP addresses.

[0004] The NAT device completes the function of network address translation, and uses...

Examples

Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and examples, but not as a limitation of the present invention.

[0034] see figure 1 , a monitoring device is deployed between the Internet and the NAT device. The device is used to obtain timestamp information in the data packets behind NAT by monitoring them. First, store a monitoring table in the monitoring device, see figure 2 , there are several structures in the table, and each structure records the following information:

[0035] ΔT, Time1, Time2, Port[n].

[0036] Among them, ΔT represents the difference between the standard time and the time stamp of a certain host, and this difference is also used to identify this host, and all the values ​​of ΔT are equal to the same host. This value is also numerically equal to the power-on of the host at the ΔT standard time. The so-called standard time refers to the time of the monitoring device, here is a counter, th...

technical field

[0001] The invention relates to the field of network monitoring, in particular to a method and device for detecting the number of active hosts. Background technique

[0002] In the era when the IP protocol was originally designed, due to the limited number of devices that can be interconnected, the length of the IP address was defined as 32 bits. However, with the rapid development of the Internet, address resources are consumed rapidly. In order to cope with the IP addresses that are about to be exhausted, the Network Address Translation (NAT-Network Address Translate) technology is introduced.

[0003] This technology maps private network address information to public network address information, so that internal users can communicate with the outside world without obtaining public network addresses, which greatly alleviates the shortage of public network IP addresses.

[0004] The NAT device completes the function of network address translation, and uses...

Examples

Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and examples, but not as a limitation of the present invention.

[0034] see figure 1 , a monitoring device is deployed between the Internet and the NAT device. The device is used to obtain timestamp information in the data packets behind NAT by monitoring them. First, store a monitoring table in the monitoring device, see figure 2 , there are several structures in the table, and each structure records the following information:

[0035] ΔT, Time1, Time2, Port[n].

[0036] Among them, ΔT represents the difference between the standard time and the time stamp of a certain host, and this difference is also used to identify this host, and all the values ​​of ΔT are equal to the same host. This value is also numerically equal to the power-on of the host at the ΔT standard time. The so-called standard time refers to the time of the monitoring device, here is a counter, th...

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