IPv6: Mobility

modulename: mip6.ko

configname: CONFIG_IPV6_MIP6

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The IPv6 protocol
└─>IPv6: Mobility
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  
Support for IPv6 Mobility described in RFC 3775.

If unsure, say N.

source code:
net/ipv6/mip6.c
selects
CONFIG_XFRM