How do you define an IPv6 /64 block in Apache virtual host

Question

I tried every combination but I keep getting error restarting Apache. Does anyone knows how to define a block inside apache virtualhost?

<VirtualHost "[2601:9ab4:48af:97::/64]:80" _default_:*>
<VirtualHost [2601:9ab4:48af:97::/64]:80 _default_:*>
<VirtualHost [::/64]:80 _default_:*>
<VirtualHost [::]/64:80 _default_:*>
<VirtualHost [*:/64]:80 _default_:*>

Answer 1

TLDR; you can't use CIDR notation or IP-address ranges in VirtualHost directives.

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Apache is configured to respond to requests on either :

• a single specific IP-address and port number with the Listen directive
  Either an IPv6 addresss

  Listen [2601:9ab4:48af:97::1]:80
  

  or an IPv4 address

  Listen 127.0.0.1:80
  

• multiple specific IP-addresses and port numbers by adding multiple Listen directives, one for each unique ip-address and port number

  Listen [2601:9ab4:48af:97::1]:80
  Listen [2601:9ab4:48af:97::2]:80
  Listen [2601:9ab4:48af:97::3]:80
  Listen 127.0.0.1:80
  Listen 127.0.0.2:81
  

• every IP-address configured on the host by only setting the port number:

  Listen 80
  Listen 443
  

As far as I know you can't use a netmask or define a range of ip-addresses in the Listen directive.

After apache httpd is configured accept incoming connections by the above Listen directive(s) you can optionally create VirtualHost entries.

You can then create IP based virtual hosts (where you are again restricted to a specific IP-address), name based virtual hosts where the Host: header with a DNS domainname in http request headers will by handled by the VirtualHost with that hostname or hostname pattern in the ServerName or ServerAliasdirective and a default VirtualHost (typically the first VirtualHost entry) that handles all request that don't match a more specific IP based or Name Based VirtualHost. See: https://httpd.apache.org/docs/2.4/vhosts/details.html

Answer 2

First, I think you should listen to the commenters and limit your virtual host to one IP address. Even if you want to try to listen to more than one, maybe try getting one working first.

Second, I do not think you need the quotes around the IP address.

Third, have you tried any of those without the "/64" CIDR notation? Using the second line as an example:

<VirtualHost [2601:9ab4:48af:97::]:80>

I don't see anything about CIDR notation in the Apache docs here:

https://httpd.apache.org/docs/2.4/mod/core.html#virtualhost