What to do if some functions of the router networking are not working? In fact, after using the router for networking, various functions in the network may fail to work. This is mostly due to configuration issues with the router. Let’s take the Huawei router as an example to look at the solutions.
1. In the networking environment of Huawei routers, Huawei A and Huawei B form a VRRP backup group, with Huawei A as the master. Router D is interconnected with Huawei B via a single link. The user network segment address on Router C and the network segment address on Router D are consecutively assigned, one is 10.199.X.32/28 and the other is 10.199.X.48/28. After configuration, initially, users in the network segment under Router C can access the services under Router D normally.
2. After a period of time, users reported that the network segment under Router C could not connect to the service network segment under Router D, but access to other network segments was normal. Specifically, the network segment under Router C cannot ping any address in the Router D segment, and Router D also cannot ping the service addresses under Router C, but it can ping the VRRP gateway address on the router for the network segment under Router C. Similarly, communication from Router D users to other service network segments is also normal.
1. From the phenomenon, the problem only occurs between the service network segments of Router C and Router D, and it is initially judged that it may be caused by routing issues.
2. Since Router D can ping the VRRP gateway address of the network segment under Router C on the NE40, it indicates that the routing from Router D to Router C is normal.
3. Pinging the actual IP address of the VRRP interface on Huawei A to the Router D network segment yields normal results, indicating that there is no routing issue from Huawei A to the service network segment under Router D.
4. Executing the display interface command and display ip routing-table command further checks the link status and routing table information between Huawei B and Router D, Router C, and confirms that there are no routing issues with the network devices. The problem is focused on the NE40 and the PC terminal under Router C.
5. Testing the PC terminal under Router C to the gateway and other service network segments shows that the ping packets are normal.
6. Directly connecting a portable device to Router C for testing shows that it can communicate with the network segment under Router D, indicating that the issue lies with the PC terminal under Router C.
7. Carefully checking the network configuration of the PC terminal under Router C reveals that the IP address subnet mask length was originally set to 26, leading to a subnet conflict.
Here we just need to reset the subnet mask length of the PC terminal’s IP address to 28, and the communication from the network segment under Router C to the service network segment under Router D will be normal, resolving the issue.
Because Router C and Router D are not actually on the same local physical network, and NE40 does not process this ARP request message, the PC does not receive the ARP response, so the PC terminal under Router C cannot communicate with Router D.
However, for packets with destination addresses in other network segments, the PC will directly send the packets to the NE40 via the default gateway, so the PC can access other service network segments normally.
The above is the troubleshooting analysis and solution for the issue of some functions not working in router networking. I hope it helps everyone. Thank you for reading.
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