Monday, November 8, 2010

eth0 errors +WARNINGS packets is + outside range

■ Error : eth0 error "WARNINGS: packets is outside range"
■ OS Environment : Linux[RHEL, Centos]
■ Application: ethtool
■ Symptom  :

  Following messages had been received from munin monitoring service :

eth0 errors
WARNINGs: packets is 1.52 (outside range [:1]).

■  Investigation : 
            My basic concept is, either eth0 is being overloaded or isn't compatible with kernel or OS. So, I checked the settings of the eth0 and RX(receive) and TX(transmit) packet errors and I found that there is error at RX. It looks like below :

$ethtool eth0
RX packets:162432463 errors:3770202 dropped:0 overruns:0
TX packets:258975594 errors:0 dropped:0 overruns:0 carrier:0

You can use other commands to check the continuous traffic statistics of the card like :

$ watch -n 1 cat /proc/net/dev
$ sar -n DEV|more
$ netstat -plan --interfaces=eth0

I contacted the owner of the server and he assured me that the maximum speed of the NIC is 1GB/sec.

■ Resolution :

Increased speed to 1 Gbs. 

$ethtool -s eth0 speed 1000 duplex full

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