Communication apparatus having network communication function, control method for the communication apparatus, and storage medium
A communication apparatus having a communication function, which is capable of improving security while ensuring convenience in network communication using the ICMP Echo protocol. It is determined whether or not a source of a received packet is an apparatus lies in the same network as a network in which the communication apparatus is installed. According to the determination result, whether or not to respond to the received packet is judged based on one of a first judgment condition used in a case where the source lies in the same network as the network in which the communication apparatus is installed, and a second judgment condition used in a case where the source does not lie in the same network as the network in which the communication apparatus is installed. According to the judgment result, a response to the received packet is sent back.
1. A communication apparatus comprising:
a receiving unit configured to receive a packet;
a determination unit configured to determine whether a source of the packet received by said receiving unit is an apparatus lying in the same network as a network in which the communication apparatus lies;
a judgment unit configured to, according to a result of the determination by said determination unit, judge whether to respond to the packet received by said receiving unit based on a first judgment condition in a case where it is determined that the source is the apparatus lying in the same network as the network in which the communication apparatus lies, and judge whether to respond to the packet received by said receiving unit based on a second judgment condition in a case where it is determined that the source is not the apparatus lying in the same network as the network in which the communication apparatus lies; and
a response unit configured to, according to a result of the judgment by said judgment unit, respond to the packet received by said receiving unit.
2. The communication apparatus according to claim 1 , further comprising:
a setting unit configured to set the first judgment condition and the second judgment condition in accordance with an instruction from a user.
3. The communication apparatus according to claim 1 , wherein the first judgment condition relates to at least one of the following: a payload length of the packet received by said receiving unit, a source address of the packet received by said receiving unit, and the number of receipts of the packet received by said receiving unit.
4. The communication apparatus according to claim 1 , wherein the second judgment condition relates to at least one of the following: a data pattern of the packet received by said receiving unit, and authentication of user information included in the packet received by said receiving unit.
5. The communication apparatus according to claim 1 , wherein the packet received by said receiving unit is an ICMP Echo packet.
6. A control method for a communication apparatus, comprising:
a receiving step of receiving a packet;
a determination step of determining whether a source of the packet received in said receiving step is an apparatus lying in the same network as a network in which the communication apparatus lies;
a judgment step of, according to a result of the determination in said determination step, judging whether to respond to the packet received in said receiving step based on a first judgment condition in a case where it is determined that the source is the apparatus lying in the same network as the network in which the communication apparatus lies, and judge whether to respond to the packet received by said receiving step based on a second judgment condition in a case where it is determined that the source is not the apparatus lying in the same network as the network in which the communication apparatus lies; and
a response step of, according to a result of the judgment in said judgment step, responding to the packet received in said receiving step.
7. A computer-readable non-transitory storage medium storing a program for implementing a control method for controlling a communication apparatus, the control method comprising:
a receiving step of receiving a packet;
a determination step of determining whether a source of the packet received in said receiving step is an apparatus lying in the same network as a network in which the communication apparatus lies;
a judgment step of, according to a result of the determination in said determination step, judging whether to respond to the packet received in said receiving step based on a first judgment condition in a case where it is determined that the source is the apparatus lying in the same network as the network in which the communication apparatus lies, and judge whether to respond to the packet received by said receiving step based on a second judgment condition in a case where it is determined that the source is not the apparatus lying in the same network as the network in which the communication apparatus lies; and
a response step of, according to a result of the judgment in said judgment step, responding to the packet received in said receiving step.