Describe the bug

Connection to localhost (::1) are blocked when using IPv6. In many distributions localhost resolves to ::1 instead of 127.0.0.1, even when outbound ipv6 connectivity is not enabled. This causes connectivity to services in the same host/pod to be blocked in some setup.

Expected behavior

When using IPv4 istio does not intercept/block connections to localhost. I would expect the same behavior when using IPv6 localhost address ::1

Steps to reproduce the bug

Create an application that tries to talk to itself using ::1 on a machine/container where ipv6 localhost address is enabled. When using istio the connection will timeout

Version
Kubernetes (GKE) 1.11.5 and istio 1.0.3 but I can see that this is happening also on 1.0.5

Installation

Via GCE console, by selecting "Istio" as an addon

Environment

GKE, container is based on debian