The IPv6 protocol

modulename: ipv6.ko

configname: CONFIG_IPV6

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The IPv6 protocol
In linux kernel since version 2.6.12  
Support for IP version 6 (IPv6).

For general information about IPv6, see
<https://en.wikipedia.org/wiki/IPv6>.
For specific information about IPv6 under Linux, see
Documentation/networking/ipv6.txt and read the HOWTO at
<http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/>

To compile this protocol support as a module, choose M here: the
module will be called ipv6.

source code:
net/ipv6/