Reccuring TCP stats Warning

[Xavier]

Hi,
I regularly receive this kind of warning from my Nagios (dozens per day):

WARN - Segments/s (in/out): 18.56/16.02, RST: 0.00/s, SYN failed: 0.08/s, Retransmission rate: 1.23% limit: 1.00%, TCP error rate: 0.00%

A few seconds later Nagios informs me that the interface is back to normal. Nothing in /var/log/messages nor in dmesg
Here is the config of my interface

[root@numenor ~]# ifconfig igb0
igb0: flags=1008943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
        options=4a520b9<RXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,HWSTATS,MEXTPG>
        ether d0:50:99:c1:12:79
        inet 192.168.100.144 netmask 0xffffff00 broadcast 192.168.100.255
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

What can I do to fix this ?
Regards,
Xavier

 

[SirDice]

Dodgy internet connection? And a service that tries to call home, but ends up with a couple of retransmissions due to the bad connection?

Not everything is within your control.