Neighbour table overflow

查詢狀態
arp -an|wc -l

grep . /proc/sys/net/ipv4/neigh/default/gc_thresh*
/proc/sys/net/ipv4/neigh/default/gc_thresh1:512
/proc/sys/net/ipv4/neigh/default/gc_thresh2:4096
/proc/sys/net/ipv4/neigh/default/gc_thresh3:8192

解决方法：
echo 60   > /proc/sys/net/ipv4/neigh/default/gc_stale_time
echo 512  > /proc/sys/net/ipv4/neigh/default/gc_thresh1
echo 2048 > /proc/sys/net/ipv4/neigh/default/gc_thresh2
echo 4096 > /proc/sys/net/ipv4/neigh/default/gc_thresh3

echo "net.ipv4.neigh.default.gc_thresh1 = 512"  >> /etc/sysctl.conf
echo "net.ipv4.neigh.default.gc_thresh2 = 2048" >> /etc/sysctl.conf
echo "net.ipv4.neigh.default.gc_thresh3 = 4096" >> /etc/sysctl.conf
sysctl -p