Kernel throws "Neighbour table overflow" messages after connecting to or discovering a large number of network hosts

Solution Verified - Updated -

Issue

  • System generates kernel messages such as
Jan 6 12:01:22 example kernel: Neighbour table overflow.
Jan 6 12:01:22 example last message repeated 5 times 
  • Why does kernel throw "Neighbour table overflow" messages in syslog when starting DataFabric Manager application and network stops responding in Red Hat Enterprise Linux 5 system?

  • NTP servers arp tables are overflowing because of the number of clients pointed to each.

Environment

  • Red Hat Enterprise Linux 5, 6 or 7
  • Openshift Container Platform
  • Application that connects to or discovers a large number of network hosts (specifically > 1024) in a short period of time

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