* bei IPv4
<pre>net.ipv4.neigh.default.gc_thresh1</pre><pre>net.ipv4.neigh.default.gc_thresh2</pre><pre>net.ipv4.neigh.default.gc_thresh3</pre>
* bei IPv6
<pre>net.ipv6.neigh.default.gc_thresh1</pre><pre>net.ipv6.neigh.default.gc_thresh2</pre><pre>net.ipv6.neigh.default.gc_thresh3</pre>
sysctl -w net.ipv4.neigh.default.gc_thresh1=8192