ICMP
Internet Control Message Protocol (ICMP) is a network layer protocol used for allowing gateways or destination hosts to communicate to report errors or to inform of certain network entities of particular network conditions.
ICMP messages are sent in several situations: for example, when a datagram cannot reach its destination, when the gateway does not have the buffering capacity to forward a datagram, and when the gateway can direct the host to send traffic on a shorter route.
The ping and Traceroute utilities both use ICMP as part of their implementation.
Links
Links to this page:
- ASA - object group protocol vs service
- CoPP - Best practices and operation
- ICMP - Mitigating Vulnerabilities
- ICMP - Vulnerabilities
- ICMP - response to a ping that is blocked by an ACL
- ICMP codes and types
- IP SLA - Route Flapping Problem
- IP SLA Parameters
- IPv4 - header protocol field
- IPv6 - DHCPv6
- IPv6 - NDP Neighbor Discovery Process
- Infrastructure ACLs Application Best Practices
- Interface MTU and Frame Handling
- MTU - MSS and Jumbo Frames
- MTU - Path MTU Discovery (PMTUD)
- NHRP - Destination Protocol Address
- Ping - possible ping responses
- Ping - specifying size
- Ping
- QoS Groups Example
- VRRP - Virtual IP doesn't respond to pings
- ZBFW and ICMP Behavior
- traffic generator options