a></div><h2 id=changes>Changes</h2><ul><li><p><strong>Improved</strong> <code>iptables</code> locking. The new implementation uses <code>iptables</code> builtin lock waiting when needed, and disables locking entirely when not needed.</p></li><li><p><strong>Added</strong> gated flag <code>ISTIO_ENABLE_IPV4_OUTBOUND_LISTENER_FOR_IPV6_CLUSTERS</code> to manage an additional outbound listener for IPv6-only clusters to deal with IPv4 NAT outbound traffic.
This is useful for IPv6-only cluster environments such as