Server constantly lost network connection.

Solution Verified - Updated -

Issue

  • When we go to console, and "service network restart", the network then will be enabled for a while. However, after a period of time, the server lost network connection, and can't be reachable by ping again.
  • Connectivity is lost frequently with link up and down events seen in the logs:
var/log/messages:Jul 31 12:43:23 hostname kernel: mlx4_en: eth2: Link Up
var/log/messages:Jul 31 12:43:23 hostname kernel: mlx4_en: eth2: Link Down
var/log/messages:Jul 31 12:43:23 hostname kernel: mlx4_en: eth2: Link Up
var/log/messages:Jul 31 14:16:55 hostname kernel: mlx4_en: eth0: Link Down
var/log/messages:Jul 31 14:16:56 hostname kernel: mlx4_en: eth3: Link Down
var/log/messages:Jul 31 14:16:56 hostname kernel: mlx4_en: eth1: Link Down
var/log/messages:Jul 31 14:16:56 hostname kernel: mlx4_en: eth2: Link Down

Environment

  • RHEL 6
  • kernel older than kernel-2.6.32-642.el6

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