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netstat graph on redhat es release 3 and hpux 11.00

Hi all,

i have problem on graph netstat0 (network I/O bits second)on my lunux box: all the values are 'nan'.
It's used the ifconfig output to create this graph?

These is my ifconfig output:

 eth0      Link encap:Ethernet  HWaddr 0F:FF:22:33:10:3F
          inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.xxx  Mask:xxx.xxx.xxx.xxx
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:35509051 errors:0 dropped:0 overruns:0 frame:0
          TX packets:29209963 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2086303447 (1989.6 Mb)  TX bytes:3414408910 (3256.2 Mb)
          Interrupt:11

eth0:0    Link encap:Ethernet  HWaddr 0F:FF:20:33:10:3F
          inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.xxx  Mask:xxx.xxx.xxx.xxx
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:11

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:426253408 errors:0 dropped:0 overruns:0 frame:0
          TX packets:426253408 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2727990196 (2601.6 Mb)  TX bytes:2727990196 (2601.6 Mb)
There is something different from other linux version?

On my hpux box :
on netstat1 graph the values UDP In/Out Datagrams are 'nan'
on netstat2 graph the values TCP Failed Attemps and TCP Established Reset are 'nan' 
on netstat3 graph the value TCP Established Connections is 'nan'

Probabily the output from my netstat command is different 

thanks for yours helps

Marco