Ipv6 issue with NGINX Ingress Controller 1.7.0

[etavene]

Describe the bug
The nginx ingress functionality is not working as expected with ipv6 only k8 cluster. The issue is intermittent, some times in a fresh deployment nginx is responding to any http/https queries but in other deployments the same config doesnt respond. Is ipv6 fully supported with nginx? Any inputs are appreciated. Where as in a ipv4 only setup's, we dont see any errors any time with respect to nginx.

To Reproduce
Steps to reproduce the behavior:

In a non working scenario, the request is getting forward to nginx, but some how the conection are reset. But in other deployments the same config working is fine sometimes. Not able to find the reason for this inconsistent behaviour.

curl -6 -k -v https://testserver.com either not responding or getting connection refused errors.

note: The nginx ingress pod IP ends with 1e8c
host Ip is 1212:60

Expected behavior
consistent behaviour with ipv6

Your environment

• Version of the Ingress Controller - release version or a specific commit

• nginx version: nginx/1.17.10
  built by gcc 8.3.0 (Debian 8.3.0-6)
  built with OpenSSL 1.1.1d 10 Sep 2019
  TLS SNI support enabled

• Version of Kubernetes
  Client Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.3"

• Kubernetes platform -kubespray

• Using NGINX
  Nginx image verison - nginx/nginx-ingress:1.7.0

My virtual server config is

apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
name: web-app-vs
annotations:
nginx.org/rewrites: "rewrite=/"
spec:
host: testserver.com
tls:
secret: server-secret
redirect:
enable: true
code: 301
basedOn: scheme
upstreams:

• name: web-app
  service: web-app-svc
  port: 80
  routes:
• path: /
  action:
  pass: web-app

The nginx-ingress is running as a daemon-set in a single node, using hostports 80 and 443

[github-actions]

Hi @etavene thanks for reporting!

Be sure to check out the docs while you wait for a human to take a look at this 🙂

Cheers!

[pleshakov]

Hi @etavene

Unfortunately, while NGINX support ipv6, the Ingress Controller doesn't support it yet - the IC doesn't configure NGINX with proper ipv6 configuration. Here is an issue to track the status of the feature -- #991

[tomasohaodha]

Closing this issue as we have another one tracking same #991.