Cisco Cisco Expressway 维护手册
Network Utilities
This section provides information about how to use the network utility tools:
■
: allows you to check that a particular host system is contactable from the Expressway and that your
network is correctly configured to reach it.
■
: allows you to discover the details of the route taken by a network packet sent from the
Expressway to a particular destination host system.
■
: allows you to discover the path taken by a network packet sent from the Expressway to a particular
destination host system.
■
: allows you to check which domain name server (DNS server) is responding to a request for a
particular hostname.
Ping
The Ping tool (Maintenance > Tools > Network utilities > Ping) can be used to assist in troubleshooting system
issues.
issues.
It allows you to check that a particular host system is contactable and that your network is correctly configured to
reach it. It reports details of the time taken for a message to be sent from the Expressway to the destination host
system.
reach it. It reports details of the time taken for a message to be sent from the Expressway to the destination host
system.
To use this tool:
1.
In the Host field, enter the IP address or hostname of the host system you want to try to contact.
2.
Click Ping.
A new section will appear showing the results of the contact attempt. If successful, it will display the following
information:
information:
Host
The hostname and IP address returned by the host system that was queried.
Response time
(ms)
(ms)
The time taken (in ms) for the request to be sent from the Expressway to the host system and
back again.
back again.
Traceroute
The Traceroute tool (Maintenance > Tools > Network utilities > Traceroute) can be used to assist in troubleshooting
system issues.
system issues.
It allows you to discover the route taken by a network packet sent from the Expressway to a particular destination
host system. It reports the details of each node along the path, and the time taken for each node to respond to the
request.
host system. It reports the details of each node along the path, and the time taken for each node to respond to the
request.
To use this tool:
1.
In the Host field, enter the IP address or hostname of the host system to which you want to trace the path.
2.
Click Traceroute.
A new section will appear with a banner stating the results of the trace, and showing the following information for
each node in the path:
each node in the path:
TTL
(Time to Live). This is the hop count of the request, showing the sequential number of the node.
Response
This shows the IP address of the node, and the time taken (in ms) to respond to each packet received
from the Expressway.
from the Expressway.
***
indicates that the node did not respond to the request.
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Cisco Expressway Administrator Guide
Maintenance