Increase net.nf_conntrack_max

roles/mesh-routing/files/sysctl.conf

@@ -1,6 +1,8 @@
 ## Networking
 # See https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt
 
+net.nf_conntrack_max = 131072
+
 ## IPv4 tuning
 
 # Reset all configuration parameters to RFC1812