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Link:
Netw
ork
T
ools
Three test tools are available from this page.
NSLookup
- converts a domain name to its IP address and vice versa.
Ping
- tests the “reachability” of a particular network destination by sending an ICMP
echo request and waiting for a reply.
TraceRoute
- displays the path to a destination by showing the number of hops and the
router addresses of these hops.
1.
To use the NSLookup capability, type an address (domain name or IP
address) in the text box and click the
NSLookup
button
Example: Show the IP Address for
grosso.com
.
Result: The DNS Server doing the lookup is displayed in the
Server:
and
Address:
fields. If the Name Server can find your entry in its table, it is displayed in the
Name:
and
Address:
fields.
Server :
controller2.netopia.com
Address :
143.137.137.9
Name :
www.grosso.com
Address :
192.150.14.120
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PING:
The network tools section sends a PING from the Gateway to either the LAN or WAN
to verify connectivity. A PING could be either an IP address (163.176.4.32) or Domain
Name (www.netopia.com).
2.
To use the Ping capability, type a destination address (domain name or IP
address) in the text box and click the
Ping
button.
Example: Ping to grosso.com.
Result: The host was reachable with four out of five packets sent.
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Below are some specific tests:
3.
To use the TraceRoute capability, type a destination address (domain
name or IP address) in the text box and click the
T
raceRoute
button.
Action
If PING is not successful, possible causes are:
From the Gateway's Network
Tools page:
Ping the internet default gateway IP
address
DSL is down, DSL or ATM settings are incorrect; Gate-
way’s IP address or subnet mask are wrong; gateway
router is down.
Ping an internet site by IP address
Gateway’s default gateway is incorrect, Gateway’s sub-
net mask is incorrect, site is down.
Ping an internet site by name
DNS is not properly configured on the Gateway; config-
ured DNS servers are down; site is down.
From a LAN PC:
Ping the Gateway’s LAN IP address
IP address and subnet mask of PC are not on the same
scheme as the Gateway; cabling or other connectivity
issue.
Ping the Gateway’s WAN IP address
Default gateway on PC is incorrect.
Ping the Gateway’s internet default
gateway IP address
NAT is off on the Gateway and the internal IP addresses
are private.
Ping an internet site by IP address
PC's subnet mask may be incorrect, site is down.
Ping an internet site by name
DNS is not properly configured on the PC, configured
DNS servers are down, site is down.
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Example: Show the path to the grosso.com site.
Result: It took 20 hops to get to the grosso.com web site.
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