Ciso Ping and Traceroute Response Codes Understanding the Ping and Traceroute Commands Ciso Ping Response Codes Character Description ! Each exclamation point indicates receipt of a reply . Each period indicates the network server timed out while waiting for a reply U A destination unreachable error PDU was received Q Source quench (destination too busy) M Could not fragment ? Unknown packet type & Packet lifetime exceeded Ciso Ping Response Codes Repsponse Meaning ! (exlcamation mark) Success . (period) Timed out waiting for reply U Destination unreachable | (vertical bar) Ping process unterrupted ? (question mark) Unknown packet type C Congestion-experienced & (ampersand) Time to live exceeded Ciso Traceroute Response Codes IP Traceroute Text Characters Character Description nn msec For each node, the round-trip time in milliseconds for the specified number of probes * The probe timed out A Administratively prohibited (example, access-list) Q Source quench (destination too busy) I User interrupted test U Port unreachable H Host unreachable N Network unreachable P Protocol Unreachable T Timeout ? Unknown packet type Ciso Traceroute Response Codes Response Meaning * Timed out !H Router received paket but did not forward it N Network unreachable P Protocol unreachable U Port Unreachable