TP-Link Wok TP-Link Wok User Manual

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TL-WA830RE
300Mbps Wireless N Range Extender User Guide
42
4.7.2 Diagnostic
Selecting System Tools > Diagnostic allow you to check the connections of your network
components on the screen shown in Figure 4-29.
Figure 4-29 Diagnostic
Diagnostic Tools - Click the radio button to select one diagnostic tool
• 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

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