- If GRE tunneling is being used it is recommended that the kernel
- be compiled with IPv6 support (CONFIG_IPV6). This allows for
- special handling (such as path MTU discovery) of IPv6 packets.
+ To use GRE tunneling on Linux 2.6.37 or newer, kernel support
+ for GRE must be compiled in or available as a module
+ (CONFIG_NET_IPGRE_DEMUX).