Re: [RFC PATCH net-next 1/1] ipv6: add support of ECMP

[YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>]

Hello.

Nicolas Dichtel wrote:
> This patch adds the support of equal cost multipath for IPv6.
> 
> The patch is based on a previous work from
> Luc Saillard <luc.saillard@6wind.com>.
> 
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
:
> +config IPV6_MULTIPATH
> +	bool "IPv6: equal cost multipath for IPv6 routing"
> +	depends on IPV6
> +	default y
> +	---help---
> +	  Enable this option to support ECMP for IPv6.
> +	  If unsure, say N.
> +
> +choice
> +	prompt "IPv6: choose Multipath algorithm"
> +	depends on IPV6_MULTIPATH
> +	default IPV6_MULTIPATH_ROUTE
> +	---help---
> +	  Define the method to select route between each possible path.
> +
> +	config IPV6_MULTIPATH_ROUTE
> +	bool "IPv6: MULTIPATH flow algorithm"
> +	---help---
> +	  Multipath routes are chosen according to hash of packet header to
> +	  ensure a flow keeps the same route.
> +
> +	config IPV6_MULTIPATH_RR
> +	bool "IPv6: MULTIPATH round robin algorithm"
> +	---help---
> +	  Multipath routes are chosen according to Round Robin.
> +
> +	config IPV6_MULTIPATH_RANDOM
> +	bool "IPv6: MULTIPATH random algorithm"
> +	---help---
> +	  Multipath routes are chosen in a random fashion.
> +endchoice

We should use hash-based algorithm by default,
according to RFC4311.  See also RFC6438.

Regards,

--yoshfuji