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title: How to enable IPv6 in applications
---
pub_date: 2019-09-26
---
author: Team ungleich
---
twitter_handle: ungleich
---
abstract:
New to IPv6? Wondering how to enable IPv6 in your favorite
application? Then this blog entry is for you.
---
body:
In this blog article you'll find some hints on how to enable IPv6 for
various applications.
## nginx
The web server nginx by default only listens to IPv4 if you use
the standard `listen *:80;` directive. To enable IPv6, use
`listen [::]:80;`. So for a dual stack server, your configuration
could look as follows:
```
server {
listen *:80;
listen [::]:80;
...
}
```
## haproxy
There are various interesting configuration options in HAProxy related
to IPv6. Let's have a look at each of them!
To enable IPv6 transport for the local logging, use `log [::1]` in the
global section:
```
global
log [::1] local2
...
```
If you want a frontend to listen to either IPv6 or IPv4 only, you can
use the `ipv6@` prefix as follows:
```
# IPv6 http frontend
frontend httpipv6
bind ipv6@:80
mode http
# IPv4 http frontend
frontend httpipv4
bind ipv4@:80
mode http
...
```
If you want to connect to the backends only via a specific protocol,
we can use the prefix syntax there as well:
```
backend httpipv4
mode http
use-server ungleich.ch if { hdr(host) -i ungleich.ch }
server ungleich.ch ipv6@ungleich.ch
...
```
To proxy IPv6 requests to IPv4 only [twitter](https://twitter.com), you could
use the following configuration:
```
# ipv6 https
frontend httpsipv6
bind ipv6@:443
mode tcp
option tcplog
tcp-request inspect-delay 5s
tcp-request content accept if { req_ssl_hello_type 1 }
default_backend httpsipv6
backend httpsipv6
mode tcp
use-server twitter.com if { req_ssl_sni -i twitter.com }
server twitter.com ipv4@twitter.com
```
## Other applications
If you know about other applications or want to enhance one of our
configuration, we invite you to join the [IPv6
chat](https://IPv6.chat) or [write to us on
Twitter](https://twitter.com/ungleich).