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

Recording an Ali CVM troubleshooting train of thought the company network is a nat environment problem: the same service has two servers 172.19.19.252 172.19.19.187 two servers to connect to node5 found that 172.19.19.252 this server can not connect ideas: 1. The two servers are in the same security group environment, so eliminate the problem of security group firewall. 2. Ping node5 found that you can ping telnet and tcpdump to grab packets, and the host can receive them. But did not give a response to find a solution by looking up the information: modify the kernel parameters to add the parameter vi / etc/sysctl.conf on the node5 machine to add the following content net.ipv4.tcp_tw_recycle=0net.ipv4.tcp_timestamps=0 and then execute systctl-p telnet is normal. The interface is normal and some people have encountered this problem after reading it on the Internet. Tcp_tw_recycle in NAT network is recommended to be disabled and recorded here, and kernel-related parameters are carefully modified if you are not familiar with them.

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