Communication device, communication method and computer program

A communication method to be executed by a computer, comprising:

• receiving, from a specific source, frames generated in accordance with provisions of IEEE 802.1AS;
• collecting timestamps included in the received frames;
• and
• determining whether the timestamps included in the frames received from the source are normal, by comparing characteristic information of the collected timestamps with characteristic information of timestamps stored in advance in a memory.

A computer program for causing a computer to execute:

• receiving, from a specific source, frames generated in accordance with provisions of IEEE 802.1AS;
• collecting timestamps included in the received frames;
• and
• determining whether the timestamps included in the frames received from the source are normal, by comparing characteristic information of the collected timestamps with characteristic information of timestamps stored in advance in a memory.