Shulou(Shulou.com)06/02 Report--

Editor to share with you the reasons why the ip address ping is not accessible, I believe most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

The reasons for the failure of ip address ping: 1, ignore the convergence time of spanning tree; 2, some router port does not agree with user Ping; 3, multi-routing load balancing situation; 4, the network due to the delay between devices is too large; 5, the introduction of NAT will cause one-way Ping communication.

The reason why the ip address ping is not available:

1. Too impatient. That is, as soon as the network cable is plugged into the switch, it wants to Ping the gateway, ignoring the convergence time of the spanning tree. Of course, newer switches support high-speed spanning tree, or some administrators simply port users

(access port) the spanning tree protocol is turned off and the problem is solved.

2. Some router port disagrees with user Ping.

3. Interrogation control. No matter how many hops are spanned in the middle, it is normal for ICMP to fail as long as a node (including the end node) filters the Ping. The most common is the behavior of firewalls.

4. Multi-route load balancing. For example, in the remote destination host of Ping, the successful interleaving of reply and timed out results that there are two routes to the destination network segment on the gateway router, and the two routes have equal weight, but there is a problem with one route.

5. Due to the large delay between devices in the network, the ICMPecho message can not be received within the default time (2 seconds). There are several reasons for the delay, such as lines (satellite network delay is 540ms), Hong Kong server leased router processing delay, or circuitous paths caused by unreasonable routing design. Using extended Ping, add timedout time, but if Ping is connected, it is a problem of routing delay.

6. The introduction of NAT will result in one-way Ping communication. NAT can play the role of concealing the internal address. When the internal Ping is outside, the Ping can be connected because of the mapping of the NAT table. When the Ping intranet host is initiated by the outside, it is impossible to find the NAT entry of the border router.

7. Specify the extension Ping of the source address. Log in to the router, Ping the remote host, and when the ICMP echorequest is sent out the serial WAN interface, the router will specify an IP address as the source IP, this IP address

It may not be the IP of this interface or the interface does not have an IP address at all. A downstream router may not have a route to this IP segment, resulting in no Ping connection. You can use the extended Ping to specify the source IP address.

8. IP address assignment is not contiguous. Address planning failure is like laying mines in the network, address overlap or mask division discontinuity may occur in Ping. For example, in an extreme case, two hosts An and B

After multi-hop connection, A can Ping the gateway of B, and the gateway of B is set correctly, but An and B are Ping blocked. It is found that there is a second address on the network card of B, and this address overlaps with the network segment where An is located.

The above is all the contents of this article entitled "what are the reasons for the failure of ip address ping?" Thank you for your reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.