The Internet Control Message Protocol (ICMP) is based on RFC 792 and is used to send IP network errors and diagnostic messages. In this article, learn the basics of ICMP and how to filter it properly in the Cisco IOS. While ICMP is required for IP network traffic redirection and pinging hosts on your LAN or WAN, ICMP can also pose a security concern. However, ICMP is critical to the functionality of any IP network, such as your corporate network or the Internet. The Internet Control Message Protocol (ICMP) is not TCP and it’s not UDP. David Davis tells you about the basics of ICMP and how to filter it properly in the Cisco IOS. ![]()
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