diff --git a/roles/prepare/templates/95-k8s-sysctl.conf.j2 b/roles/prepare/templates/95-k8s-sysctl.conf.j2
index b1255a8..ff7fefe 100644
--- a/roles/prepare/templates/95-k8s-sysctl.conf.j2
+++ b/roles/prepare/templates/95-k8s-sysctl.conf.j2
@@ -2,8 +2,10 @@ net.ipv4.ip_forward = 1
 net.bridge.bridge-nf-call-iptables = 1
 net.bridge.bridge-nf-call-ip6tables = 1
 net.bridge.bridge-nf-call-arptables = 1
-# 
+net.ipv4.tcp_tw_recycle=0
+# disable ipv6
+net.ipv6.conf.all.disable_ipv6=1
 net.netfilter.nf_conntrack_max=1000000
 vm.swappiness = 0
 vm.max_map_count=655360
-fs.file-max=655360
+fs.file-max=6553600