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Ping
- This diagnostic tool troubleshoots connectivity, reachability, and name resolution to a
given host or gateway by using the Internet Control Message Protocol (ICMP) protocol's
mandatory Echo Request datagram to elicit an ICMP Echo Response from a host or
gateway. You can use ping to test both numeric IP address or domain name. If pinging the IP
address is successful, but pinging the domain name is not, you might have a name resolution
problem. In this case, ensure that the domain name you are specifying can be resolved by
using Domain Name System (DNS) queries.
Traceroute
- This diagnostic tool determines the path taken to a given host by sending
Internet Control Message Protocol (ICMP) Echo Request messages with varying Time to Live
(TTL) values to the destination. Each gateway along the path is required to decrement the
TTL in an IP packet by at least 1 before forwarding it. Effectively, the TTL is a maximum link
counter. When the TTL on a packet reaches 0, the gateway is expected to return an ICMP
Time Exceeded response to your device. Traceroute determines the path by sending the first
Echo Request message with a TTL of 1 and incrementing the TTL by 1 on each subsequent
transmission until the target responds or the maximum number of hops is reached. The
maximum number of hops is 20 by default and can be specified in the field "Traceroute Max
TTL". The path is determined by examining the ICMP Time Exceeded messages returned by
intermediate gateways and the Echo Reply message returned by the destination. However,
some gateways do not return Time Exceeded messages for packets with expired TTL values
and are invisible to the traceroute tool. In this case, a row of asterisks (*) is displayed for that
hop.
IP Address
-
Enter the IP Address (such as 202.108.22.5) of the PC whose connection you wish to
diagnose.
Ping Count
-
Specifies the number of Echo Request messages sent. The default is 4.
Ping Packet Size
-
Specifies the number of data bytes to be sent. The default is 64.
Ping Timeout
-
Specifies the time to wait for a response in milliseconds. The default is 800.
Traceroute Max TTL
-
Set the maximum number of hops (max TTL to be reached) in the path to
Survey for the target (destination). The default is 20.
Click the
Start
button to start the diagnostic procedure.
The
Diagnostic Results
page displays the result of diagnosis.
If the result is similar to the following screen (Figure 4-34), the connectivity of the Internet is fine.