IPv6: AH transformation

modulename: ah6.ko

configname: CONFIG_INET6_AH

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The IPv6 protocol
└─>IPv6: AH transformation
In linux kernel since version 2.6.12  
Support for IPsec AH.

If unsure, say Y.

source code:
net/ipv6/ah6.c