Neighbour table overflow
fix neighbour table overflow if messages like this occure in logs:
kernel: [12956407.538911] Neighbour table overflow.
edit file: /etc/sysctl.conf and add or modify:
net.(ipv4|ipv6).neigh.default.gc_thresh1
net.(ipv4|ipv6).neigh.default.gc_thresh2
net.(ipv4|ipv6).neigh.default.gc_thresh3
default for v4 & v6 are:
gc_thresh1 = 128
gc_thresh2 = 512
gc_thresh3 = 1024
Keep your RAM in mind. The higher the threshes the higher the needed RAM.
So try setting something like that:
gc_thresh1 = 128/256/512/1024
gc_thresh2 = 2 * gc_thresh1
gc_thresh3 = 2 * gc_thresh2