ping response Request timed out vs Destination Host unreachable

Question

When I ping an IP address  what is the difference between Request timed out and Destination host unreachable returned from the command

User · Answer

Put very simply  request timeout means there was no response whereas destination unreachable may mean the address specified does not exist i e  you typed in the wrong IP address

User · Answer

Request timed out means that the local host did not receive a response from the destination host  but it was able to reach it   Destination host unreachable means that there was no valid route to the requested host

User · Answer

As I understand it   request timeout  means the ICMP packet reached from one host to the other host but the reply could not reach the requesting host  There may be more packet loss or some physical issue   destination host unreachable  means there is no proper route defined between two hosts

User · Answer

As khaos said  a destination unreachable could also mean that something is blocking the way from or to your destination   For example an ACL that filters bad IP addresses

User · Answer

Destination Host Unreachable  This message indicates one of two problems  either the local system has no route to the desired destination  or a remote router reports that it has no route to the destination   If the message is simply  Destination Host Unreachable   then there is no route from the local system  and the packets to be sent were never put on the wire   If the message is  Reply From  lt  IP address    Destination Host Unreachable   then the routing problem occurred at a remote router  whose address is indicated by the   lt  IP address    field   Request Timed Out  This message indicates that no Echo Reply messages were received within the default time of 1 second  This can be due to many different causes  the most common include network congestion  failure of the ARP request  packet filtering  routing error  or a silent discard   For more info Refer  http   technet microsoft com en-us library cc940095 aspx

[networking] ping response "Request timed out." vs "Destination Host unreachable"

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