ICMP

Info

Se usa entre Capa 2 y Capa 3, permite ver la conexion entre Router

Estructura

• Types
  • 0 -> Echo Reply
  • 3 -> See codes
    • C0 -> Network Unreachable
    • C1 -> Host Unreachable
    • C2 -> Protocol Unreachable
    • C3 -> Port Unreachable
  • 5 -> Redirect
  • 8 -> Echo Request

Configuracion

Eliminar ICMP (Ping)

Hacia Internet

access-list 112 permit icmp any any echo-replay
access-list 112 permit icmp any any source-quench
access-list 112 permit icmp any any unreachable
access-list 112 deny icmp any any
access-list 112 permit ip any any

Red Local

access-list 114 permit icmp 192.168.1.0 0.0.0.255 any echo
access-list 114 permit icmp 192.168.1.0 0.0.0.255 any parameter-problem
access-list 114 permit icmp 192.168.1.0 0.0.0.255 any packet-too-big
access-list 114 permit icmp 192.168.1.0 0.0.0.255 any source-quench
access-list 114 deny icmp any any
access-list 114 permit ip any any