Communication apparatus provided with LAN interfaces and preventing connection to wrong network, control method, and storage medium

Patent metadata

Field	Value
Publication number	US-11025516-B2
Application number	US-201816234230-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Jan 5, 2018
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A communication apparatus includes a notification device that notifies information, a first LAN interface that connects to a network, a second LAN interface that connects to a network, transmits a DHCP discovery packet via a LAN cable when the LAN cable is connected to the first LAN interface, and determines whether to provide a notification and to notify information based on a determination to provide a notification based on a DHCP offer packet transmitted in response to the DHCP discovery packet and network information used to communicate via the second LAN interface.

First claim

What is claimed is:

1. A communication apparatus comprising:
a notification device that notifies information;
a first LAN interface that connects to a LAN cable;
a second LAN interface that connects to the LAN cable;
a memory storing at least one program; and
at least one controller that when executing the at least one program causes the communication apparatus to:
transmit a DHCP discovery packet via the first LAN interface in response to detecting a link-up indicating the first LAN interface is connected to an external device via the LAN cable and the first LAN interface is set to use a first network using a first IP address;
acquire a candidate IP address included in a DHCP offer packet transmitted in response to the DHCP discovery packet;
check a matching between at least a part of the candidate IP address and at least a part of a second IP address associated with a second network accessible to the external device, the second IP address being currently set or previously set;
set the first IP address from the candidate IP address according to a first result of the matching; and
provide a notification via the notification device according to a second result of the matching.

2. The communication apparatus according to claim 1 ,
wherein the notification device is a display device configured to display information and the display device displays the notification.

3. The communication apparatus according to claim 1 ,
wherein when the part of the third candidate IP address matches the part of the second IP address, it is determined to provide the notification via the notification device.

4. The communication apparatus according to claim 2 ,
wherein the notification prompts a user to confirm an insertion state of the LAN cable.

5. The communication apparatus according to claim 2 ,
wherein the notification information indicates that communication using the first LAN interface is not available.

6. The communication apparatus according to claim 1 ,
Wherein, when the part of the candidate IP address matches the part of the second IP address, it is determined not to make communication via the first LAN interface with the candidate IP address.

7. The communication apparatus according to claim 1 ,
wherein a DHCP discovery packet is transmitted via a LAN cable when the LAN cable is connected to the first LAN interface.

8. The communication apparatus according to claim 1 ,
wherein the second IP address is one IP address from among a plurality of IP addresses previously set for the second LAN interface.

9. A method for controlling a communication apparatus including a notification device that notifies information, a first LAN interface that connects a LAN cable, and a second LAN interface that connects the LAN cable, the method comprising:
transmitting a DHCP discovery packet via the first LAN interface in response to detecting a link-up indicating the first LAN interface is connected to an external device via the LAN cable and the first LAN interface is set to use a first network using a first IP address;
acquiring a candidate IP address included in a DHCP offer packet transmitted in response to the DHCP discovery packet;
checking a matching between at least a part of the candidate IP address and at least a part of a second IP address associated with a second network accessible to the external device, the second IP address being currently set or previously set;
setting the first IP address from the candidate address according to a first result of the matching; and
providing a notification the notification device according to a second result of the matching.

10. A non-transitory computer-readable storage medium storing a program for causing a computer to perform a method for controlling a communication apparatus including a notification device that notifies information, a first LAN interface that connects a LAN cable, and a second LAN interface that connects the LAN cable, the method comprising:
transmitting a DHCP discovery packet via the first LAN interface in response to detecting a link-up indicating the first LAN interface is connected to an external device via the LAN cable and the first LAN interface is set to use a first network using a first IP address;
acquiring a candidate IP address included in a DHCP offer packet transmitted in response to the DHCP discovery packet;
checking a matching between at least a part of the candidate IP address and at least a part of a second IP address associated with a second network accessible to the external device, the second IP address being currently set or previously set;
setting the first IP address from the candidate address according to a first result of the matching; and
providing a notification via the notification device according to a second result of the matching.

11. A communication apparatus comprising:
a first LAN interface that connects a LAN cable;
a second LAN interface that connects the LAN cable;
at least one memory storing at least one program; and
at least one controller that when executing the at least one program causes the communication apparatus to:
transmit a DHCP discovery packet via the first LAN interface in response to detecting a link-up of indicating the first LAN interface is connected to an external device via the LAN cable and the first LAN interface is set to use a first network using a first IP address;
acquire a candidate IP address included in a DHCP offer packet transmitted in response to the DHCP discovery packet;
check a matching between at least a part of the candidate IP address and at least a part of a second IP address associated with a second network accessible to the external device, the second IP address being currently set or previously set;
set the first IP address from the candidate address according to a first result of the matching; and
communicate via the first LAN interface using the candidate IP address according to a second result of the matching.

12. The communication apparatus according to claim 11 ,
wherein, when the part of the candidate IP address matches the part of the second IP address, it is determined to communicate via the first LAN interface.

13. The communication apparatus according to claim 11 ,
wherein the second IP address is one IP address from among a plurality of IP addresses previously set for the second LAN interface.

14. The communication apparatus according to claim 1 ,
wherein the part of the candidate IP address is a network part of the candidate IP address, and wherein the part of the second IP address is a network part of the second IP address.

15. The communication apparatus according to claim 11 ,
wherein the part of the candidate IP address is a network part of the candidate IP address, and wherein the part of the second IP address is a network part of the second IP address.

Assignees

• Canon Kk

Inventors

• Hashimoto Minoru

Classifications

• H04N1/32507 Primary

  a plurality of input devices · CPC title

• H04L61/5014

  using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP] · CPC title

• H04L61/5076

  Update or notification mechanisms, e.g. DynDNS · CPC title

• H04N1/0048

  Indicating an illegal or impossible operation or selection to the user · CPC title

• H04N1/00244

  with a server, e.g. an internet server (fax-servers or the like for store and forward H04N1/324) · CPC title