Analysis of the causes of UDP packet loss in Linux system kernel

Analysis of the causes of UDP packet loss in Linux system kernel

1. UDP Checksum Error

Phenomenon: You can use NETSTAT-SU to see that there is a UDP error packet.

Tcpdump catch packet, open the captured UDP message in Wireshark, turn on checksum option, error packet.

Scenario: Finding link Failure www.ahlinux.com

2, Firewall Open

Symptom: A package for a specific port is not receiving

Scenario: Use service iptables stop to shut down.

3, Rp_filter Open

Phenomenon: Tcpdump has a package, the protocol stack is not received. A package sent by one address cannot receive a package, but the other one is only sent over.

Scenario: Set the Rp_filter in/etc/sysctl.conf to 0.

See also: Http://serverfault.com/questions/163244/linux-kernel-not-passing-through-multicast-udp-packets

Check the source address of the packet and its network card address switch to prevent IP spoofing, Linux 2.6.32 by default.

4. Application performance issues, buffer full.

Symptom: The application can receive UDP packets intermittently.

Scenario: Use the Vmstat and top commands to discover CPU or IO overloads. Increase the buffer to optimize the program.

• This article is from: Linux Tutorial Network

Analysis of the causes of UDP packet loss in Linux system kernel