diff --git a/install.sh b/install.sh
index 31354b643a..2059d18415 100755
--- a/install.sh
+++ b/install.sh
@@ -673,6 +673,7 @@ ip link delete flannel.1
 ip link delete flannel-v6.1
 rm -rf /var/lib/cni/
 iptables-save | grep -v KUBE- | grep -v CNI- | iptables-restore
+ip6tables-save | grep -v KUBE- | grep -v CNI- | ip6tables-restore
 EOF
     $SUDO chmod 755 ${KILLALL_K3S_SH}
     $SUDO chown root:root ${KILLALL_K3S_SH}
diff --git a/package/rpm/install.sh b/package/rpm/install.sh
index d2c9c5d069..2a10b38ab3 100755
--- a/package/rpm/install.sh
+++ b/package/rpm/install.sh
@@ -561,8 +561,10 @@ ip link show 2>/dev/null | grep 'master cni0' | while read ignore iface ignore;
 done
 ip link delete cni0
 ip link delete flannel.1
+ip link delete flannel-v6.1
 rm -rf /var/lib/cni/
 iptables-save | grep -v KUBE- | grep -v CNI- | iptables-restore
+ip6tables-save | grep -v KUBE- | grep -v CNI- | ip6tables-restore
 EOF
     $SUDO chmod 755 ${KILLALL_K3S_SH}
     $SUDO chown root:root ${KILLALL_K3S_SH}