today When I run netstat -lnt in a my Server
I find this in my screen.

warning, got duplicate tcp line.
warning, got duplicate tcp line.
warning, got duplicate tcp line.

To fix this problem, open /etc/sysctl.conf and
# vi /etc/sysctl.conf
Append or modify text as follows:
net.ipv4.tcp_tw_reuse = 0
net.ipv4.tcp_tw_recycle = 0

#sysctl -p

or you can do this：
#echo 0 > /proc/sys/net/ipv4/net.ipv4.tcp_tw_reuse = 0
#echo 0 > /proc/sys/net/ipv4/net.ipv4.tcp_tw_recycle = 0

本文固定链接: https://www.2hei.net/2008/08/11/warning_got_duplicate_tcp_line/ | 2hei.net