JP2003008602A - DHCP server - Google Patents

Abstract

(57) [Problem] To register a correct host name in DDNS even when a host name of the terminal is not included in an IP address assignment request from the terminal or an incorrect host name is included. To provide a DHCP server that can SOLUTION: In response to an IP address assignment request from a terminal 111 having no host name, a host name is obtained by referring to a correspondence table using the MAC address of the terminal 111, and a DDNS 12
1, the host name of the terminal 111 is set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DHCP server for registering a host name of a terminal in a DDNS, and particularly when the IP address allocation request from the terminal does not include the host name of the terminal or an illegal host. The present invention relates to a DHCP server capable of registering a correct host name in DDNS even when the name is included.

[0002]

2. Description of the Related Art DHCP is standardized by RFC1541. DHCP dynamically changes the IP address to TCP /
It is a protocol for assigning to terminals on an IP network. In a network using DHCP, in order to fix a host name for a terminal, DDNS that can dynamically create a record of a set of a host name and an IP address is used.

FIG. 2 shows a conventional DHC compatible with DDNS.
An example of a network using a P server and DDNS is shown. FIG. 3 shows the structure of packets transmitted and received between the terminal, the DHCP server, and the DDNS.

The DHCP server 201 receives the packet 350 shown in FIG. 3A requesting the IP address transmitted from the terminal 211, allocates the IP address to the terminal 211, and simultaneously, the host name 351 included in the packet 350. 3B, the packet 360 containing the information of the record of the set of the host name 361 and the assigned IP address 362 shown in FIG. 3B is transmitted to the DDNS 221.

Upon receiving the packet 360, the DDNS 221 rewrites the record of the set of the host name and the IP address held by itself.

The abbreviations used in this specification are as follows:
English spelling, Japanese notation, brief explanation, etc. should be added. DHCP; Dynamic Host Configuration Protoco RFC; Request For Comments Standard Recommendation Documents issued by the Internet Architecture Committee IP; Internet Protocol Internet Protocol TCP / IP; Transmission Control Protocol / Internet Protocol Transmission Control Protocol / Internet Protocol DDNS; Dynamic Domein Name System Dynamic Domain Name System Systems specified in RFC2136 and RFC2137

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As shown in FIG.
The P server 201 uses the packet 3 of the request from the terminal 211.
Write the host name contained in 50 to the record. Therefore, as shown in FIG. 3C, when the request packet 370 that does not include the host name is received from the terminal 211, the DHCP server 201 can write the host name in the record of the packet 360. No, DDNS2
No host name is registered in 21.

If a host name different from the host name intended by the user of the terminal 211 is attached to the terminal 211 and the incorrect host name is included in the request packet 350 and transmitted, the incorrect host name is directly transmitted to the packet 360. It is registered in the DDNS 221 via the.

Therefore, an object of the present invention is to solve the above problems, and when the IP address allocation request from the terminal does not include the host name of the terminal, or when an incorrect host name is included, It is to provide a DHCP server capable of registering a correct host name in DDNS.

[0010]

In order to achieve the above object, the present invention sets a host name of a terminal in DDNS in response to an IP address allocation request from a terminal having no host name.

In addition, I from a terminal having an illegal host name
In response to the P address allocation request, the correct host name of the terminal is set in DDNS.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the DH according to the present invention.
A network using a CP server is a DH according to the present invention.
It is composed of a CP server 101, a terminal 111, and a DDNS 121. The DHCP server 101 sets the host name of the terminal in DDNS in response to an IP address allocation request from a terminal that does not have a host name, and notifies the DDNS in response to an IP address allocation request from a terminal having an invalid host name. It has the function of setting the correct host name of the terminal. In order to realize this function, the DHCP server 101 holds a correspondence table shown in Table 1 in advance. This correspondence table shows the MAC address (mac111) and host name (hostn
ame111) is stored as a list.

[0014]

[Table 1]

The DHCP server 101 receives the packet 350 requesting the IP address transmitted from the terminal 111, and allocates the IP address to the terminal 111. Also, D
The HCP server 101 looks at the MAC address contained in the packet 350, refers to the correspondence table, and obtains the host name corresponding to this MAC address. DHCP server 10
1 is this host name 361 and the assigned IP address 3
The packet 360 containing the information of the record of the pair with 62 is transmitted to the DDNS 121.

Upon receiving the packet 360, the DDNS 121 rewrites the record of the set of the host name and the IP address held by itself.

According to the present invention, even if the packet 370 requesting the IP address transmitted from the terminal 111 does not include the host name, the DHCP server 101 uses the MAC address included in the packet 370 as the correspondence table. Since the host name is assigned by reference, the host name is DD
Registered in NS121.

Further, even if the packet 350 requesting the IP address transmitted from the terminal 111 includes an illegal host name, the DHCP server 101 refers to the correspondence table by the MAC address included in the packet 370. Since the host name is assigned by the DDNS 121, the host name, that is, the correct host name is registered in the DDNS 121.

[0019]

The present invention exhibits the following excellent effects.

(1) Even when the IP address allocation request from the terminal does not include the host name of the terminal, the correct host name of the terminal can be set in the DDNS.

(2) Even if an illegal host name of the terminal is included in the IP address allocation request from the terminal, the DDN
The correct host name of the terminal can be set in S.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a network using a DHCP server showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a network using a conventional DHCP server.

FIG. 3 is a configuration diagram of a packet flowing on the networks of FIGS. 1 and 2.

[Explanation of symbols]

101 DHCP server 111 terminal 121 DDNS

Claims (2)

[Claims] 1. A DHCP server, which sets a host name of a terminal in DDNS in response to an IP address allocation request from a terminal having no host name. 2. A DHCP server which sets a correct host name of the terminal in DDNS in response to an IP address allocation request from a terminal having an illegal host name.