ipv4 & ipv6 Virtual Hosting - address in use

[António P. P. Almeida]

On 1 Dez 2010 19h24 WET, david at styleflare.com wrote:

> I have latest nginx configured;
>
> I have one that is purely ipv6 and one that is purely ipv4;
>
> They both work fine in a multi-server environment;
>
> server {
> listen          80;
> #       listen       [::]:80 ipv6only=on;
>
> server_name  domain1.com;
>
> #charset koi8-r;
>
> #access_log  logs/host.access.log  main;
>
> location / {
> root   html;
> index  index.html index.htm;
> }
>
> }
>
> server {
> listen          80;
> #       listen       [::]:80 ipv6only=on;
>
> server_name  domain2.com;
>
> #charset koi8-r;
>
> #access_log  logs/host.access.log  main;
>
> location / {
> root   html;
> index  index.html index.htm;
> }
> }
>
> If I un-comment to bind to ipv6 as well as ipv4; when nginx starts
> it complains the address is in use;
>
>
> I saw a patch for this here is the post;
>
> But according to that post it has been included in 8.39 I am using
> 8.53

Cf http://wiki.nginx.org/HttpCoreModule#listen

AFAIK, it depends on what type of sockets your OS support, IPv4 only,
IPv4+IPv6 hybrid or IPv4 and IPv6 separate.

If you're in a OS that supports hybrid sockets then it seems that your
config is incorrect, in the sense that it assumes separate IPv6 and
IPv4 sockets.

Also, AFAIK, Linux uses hybrid sockets by default, while FreeBSD uses
separate sockets for IPv4 and IPv6.

Perhaps someone more knowledgeable than I in OS' kernel networking
internals can chime in.

HTH, 
--- appa