warning, got duplicate tcp line.

运行netstat，出现warning, got duplicate tcp line，
[root@supersun.biz ~]# netstat -at |grep 'ESTABLI' |wc -l
warning, got duplicate tcp line.
warning, got duplicate tcp line.
解决方法，升级net-tools的版本：
http://mirror.centos.org/centos/4/os/x86_64/CentOS/RPMS/net-tools-1.60-39.el4.x86_64.rpm

[root@supersun.biz ~]# rpm -Uvh net-tools-1.60-39.el4.x86_64.rpm
warning: net-tools-1.60-39.el4.x86_64.rpm: V3 DSA signature: NOKEY, key ID 443e1821
Preparing...                ########################################### [100%]
   1:net-tools              ########################################### [100%]

[root@supersun.biz ~]# netstat -at |grep 'ESTABLI' |wc -l
32
错误不再出现。