Knowledge focus: Ping does not make sense because this is mainly the top ten in the external network address when Ping appear. Because when the gateway setting error, Ping packets sent by the gateway can not be forwarded. Therefore, the gateway to check the machine settings and the remote gateway is configured correctly. ..
Ping does not make sense for a top ten reasons
This occurred mainly in the Ping appear when the external network address. Because when the gateway setting error, Ping packets sent by the gateway can not be forwarded. Therefore, the gateway to check the machine settings and the remote gateway is configured correctly.
Generally,
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Second, Destination Host Unreachable
appear Looks like with the If the Ping command packets sent through the router and reach the target by the routing table the route, but for other reasons (such as firewalls,
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occurs mainly in the following several reasons: to use DHCP to automatically assign IP address of the network, is likely to be DHCP server error or does not work,
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three, Unknown host
the prompt that does not recognize the host, after the problem occurs on the target host is not necessarily the problem? Of course not! Because we use the Ping command to connect to target host name, the main responsible for the use of DNS names into IP addresses. For example = 32 time = 59ms TTL = 54 So when we see this prompt, you should check the DNS settings are correct, DNS is working properly.
when the network connection failure occurs, many administrators will be the first to use Ping to find the root of the problem. But many who find Ping unreasonable, then determine the network has failed. It is not only to judge by appearances, is likely to hide the truth. Then we use the Ping command in the process, in the end pay attention to what the problem? Or please come with me.
one, Request Timed Out
When Ping the specified object, there Of course this case, it is possible that the network fails,
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host is not online
If the person off, disable the card or disconnect the network cable, then no matter how you operate, the information will not be connected to return. To know the simplest is often the most easily overlooked.
firewall is blocking
When you install a firewall, as firewalls work, in general can automatically block the Ping command from the network, which allowed loss of response. To install a firewall, can not access the shared files will result in failure. Therefore,
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IP security policy restrictions
For many experienced administrators,
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gateway set wrong