muninでサーバー監視をしているのですが、
netstat項目のactive値が、上昇したまま下がらないのが気になっています。
トラフィックが0でも上昇したままです。
同等のシステムが実装された他サーバーでは、トラフィックと比例してactive値が変化しています。
(同等のシステムと言っても、初期のセットアップ内容や、PCスペックは違うようです)

問題のサーバー 他のサーバー
# netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State      
tcp        0      0 *:vce                       *:*                         LISTEN      
tcp        0      0 *:commplex-main             *:*                         LISTEN      
tcp        0      0 *:mysql                     *:*                         LISTEN      
tcp        0      0 *:http                      *:*                         LISTEN      
tcp        0      0 *:munin                     *:*                         LISTEN      
tcp        0      0 localhost:domain            *:*                         LISTEN      
tcp        0      0 *:ftp                       *:*                         LISTEN      
tcp        0      0 *:smtp                      *:*                         LISTEN      
udp        0      0 localhost:domain            *:*                                     
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ACC ]     STREAM     LISTENING     8471   /dev/gpmctl
unix  2      [ ACC ]     STREAM     LISTENING     8588   @/var/run/hald/dbus-PPFgLvjeQl
unix  16     [ ]         DGRAM                    6987   /dev/log
unix  2      [ ]         DGRAM                    1464   @/org/kernel/udev/udevd
unix  2      [ ]         DGRAM                    8597   @/org/freedesktop/hal/udev_event
unix  2      [ ACC ]     STREAM     LISTENING     6990   /var/run/audit_events
unix  2      [ ACC ]     STREAM     LISTENING     7139   /var/run/setrans/.setrans-unix
unix  2      [ ACC ]     STREAM     LISTENING     7422   /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     7657   /var/run/pcscd.comm
unix  2      [ ACC ]     STREAM     LISTENING     7768   /var/run/acpid.socket
unix  2      [ ACC ]     STREAM     LISTENING     8370   /tmp/.font-unix/fs7100
unix  2      [ ACC ]     STREAM     LISTENING     266078683 /tmp/ssh-ggSeuO7080/agent.7080
unix  2      [ ACC ]     STREAM     LISTENING     164188236 /tmp/mysql.sock
unix  2      [ ACC ]     STREAM     LISTENING     8589   @/var/run/hald/dbus-7mJ1PVFUTk
unix  2      [ ]         DGRAM                    266078796 
unix  3      [ ]         STREAM     CONNECTED     266078665 
unix  3      [ ]         STREAM     CONNECTED     266078664 
unix  2      [ ]         DGRAM                    266078660 
unix  2      [ ]         DGRAM                    595696 
unix  2      [ ]         DGRAM                    10693  
unix  3      [ ]         STREAM     CONNECTED     9672   /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     9671   
unix  3      [ ]         STREAM     CONNECTED     9631   @/var/run/hald/dbus-PPFgLvjeQl
unix  3      [ ]         STREAM     CONNECTED     9630   
unix  3      [ ]         STREAM     CONNECTED     9470   @/var/run/hald/dbus-PPFgLvjeQl
unix  3      [ ]         STREAM     CONNECTED     9469   
unix  3      [ ]         STREAM     CONNECTED     9409   /var/run/acpid.socket
unix  3      [ ]         STREAM     CONNECTED     9408   
unix  3      [ ]         STREAM     CONNECTED     9401   @/var/run/hald/dbus-PPFgLvjeQl
unix  3      [ ]         STREAM     CONNECTED     9399   
unix  3      [ ]         STREAM     CONNECTED     8592   @/var/run/hald/dbus-7mJ1PVFUTk
unix  3      [ ]         STREAM     CONNECTED     8591   
unix  2      [ ]         DGRAM                    8166   
unix  2      [ ]         DGRAM                    8131   
unix  2      [ ]         DGRAM                    8000   
unix  2      [ ]         DGRAM                    7717   
unix  2      [ ]         DGRAM                    7666   
unix  2      [ ]         DGRAM                    7620   
unix  3      [ ]         STREAM     CONNECTED     7502   /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     7501   
unix  2      [ ]         DGRAM                    7469   
unix  3      [ ]         STREAM     CONNECTED     7439   
unix  3      [ ]         STREAM     CONNECTED     7438   
unix  2      [ ]         DGRAM                    7138   
unix  2      [ ]         DGRAM                    7002   
unix  2      [ ]         DGRAM                    6989   
unix  3      [ ]         STREAM     CONNECTED     6945   
unix  3      [ ]         STREAM     CONNECTED     6944   
# netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State      
tcp        0      0 *:11111                     *:*                         LISTEN      
tcp        0      0 *:5000                      *:*                         LISTEN      
tcp        0      0 *:mysql                     *:*                         LISTEN      
tcp        0      0 *:http                      *:*                         LISTEN      
tcp        0      0 localhost.localdomai:domain *:*                         LISTEN      
tcp        0      0 *:4949                      *:*                         LISTEN      
tcp        0      0 *:ftp                       *:*                         LISTEN      
tcp        0      0 *:smtp                      *:*                         LISTEN      
udp        0      0 localhost.locald:domain     *:*                                     
udp        0      0 localhost.localdomain:ntp   *:*                                     
udp        0      0 *:ntp                       *:*                                     
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ACC ]     STREAM     LISTENING     5573   /tmp/mysql.sock
unix  2      [ ACC ]     STREAM     LISTENING     129914592 /tmp/ssh-DpKIP17980/agent.17980
unix  2      [ ACC ]     STREAM     LISTENING     5252   /dev/gpmctl
unix  2      [ ]         DGRAM                    3371   @udevd
unix  8      [ ]         DGRAM                    5071   /dev/log
unix  2      [ ]         DGRAM                    129915859 
unix  3      [ ]         STREAM     CONNECTED     129914569 
unix  3      [ ]         STREAM     CONNECTED     129914568 
unix  2      [ ]         DGRAM                    5659   
unix  2      [ ]         DGRAM                    5531   
unix  2      [ ]         DGRAM                    5269   
unix  2      [ ]         DGRAM                    5250   
unix  2      [ ]         DGRAM                    5215   
unix  2      [ ]         DGRAM                    5079