Destination host unreachable

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Destination host unreachable the target host cannot reach the "destination host unreachable" information, indicating that the target host does not exist or has not established a connection with the other host. The network cable is not properly connected, or the network card is faulty! Check the physical connection and restart the host. Generally, when you confirm that your TCP/IP network attribute is set correctly, check if your network cable or network card is not plugged in. I think it should be physical connection... It has been used for several years, and N is dusty... The route table does not even have a route to the target. "destination host unreachable" is displayed ". There are three main scenarios: 1. When DHCP is used to dynamically allocate IP addresses, DHCP fails, DHCP fails, or DHCP fails, and the client cannot be assigned IP addresses, the system only has a self-configured IP address, and the automatic setting of the IP address is usually assigned to different subnets, so "destination host unreachable" appears ". 2. The subnet mask setting error is generally rare. If the subnet mask is not automatically generated by the system, be careful during calculation. 3. The route table returns an error message. Generally, an IP address is added before "destination host unreachable", indicating that the local computer is connected to the external network but there is a problem with the connection to a host. "Destination net unreachable" indicates that the other host does not exist or has not established a connection with the other host. The difference between "destination host unreachable" and "time out" is described here. If the route table of the route through has a route to the target, and the target cannot be reached for other reasons, at this time, "Time Out" will appear. If no route is connected to the target in the route table, "destination host unreachable" will appear ". Disable the ICMP Security Policy TCP/IP attribute -- Advanced -- option -- IP Security Mechanism attribute -- select "do not use IPsec". OK, request time out and destination is unreachablerequest time out during normal Ping indicate that a request time out is generated because the ICMP packet does not respond for a long time after it is sent. Generally, a host that does not exist in the network is pinged. Destination is unreachable or destination port unreachable is generally the port or target host that receives the response from the target host or intermediate router cannot reach the ICMP packet. If you ping a host with an ICMP packet enclosed by iptables and use-J reject, the destination port unreachable information will appear. This is the response from the target host. The main difference between the two is to see if the target host or intermediate router gives an ICMP inaccessible response. Send an IP datagram to the target host. If the Protocol item is incorrect or the Protocol item is unavailable. The target will return the ICMP packet destined for is unreachable. If a firewall exists, IP datagram may be filtered out and no response message is received. If the IP header protocol is set to a very large number (at least not used today), the host must return unreachable ICMP packets. Otherwise, there must be a firewall. You can also change the Protocol items in the IP address to detect which protocols are used by the host. If not, the unreachable ICMP packet is returned.

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1: the IP address is not set in the same CIDR block. 2: if the NIC is disabled, enter ipconfig/all in cmd to see if there is anything wrong or if it is okay to try ipconfig/renew to refresh the IP address. If you ping 127.0.0.1, the NIC cannot be pinged. that is, your network card is broken or disabled.

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Jinruin | level 2

The gateway is not set correctly.

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| Comment2006-11-2 0:01
Telneting | level 1

In addition, if the host is not connected to a VLAN, the destination host unreachable will also appear.