Prefix Delegation /56 on ipv6 (modem isp in bridge mode)

OpenWrt 21.02.1 r16325-88151b8303 / LuCI openwrt-21.02 branch git-21.301.66596-f28aaa3

My ISP is going to add ipv6 support to my bridged modem (finally) In there small manual they claim I have to set my Prefix Delegation to value /56.

Anyone who can tell me where I add this in my config files?

something like this?

config interface 'wan6'
	option proto 'dhcpv6'
	option reqaddress 'try'
	option peerdns '0'
	list dns '2001:1608:10:25::1c04:b12f'
	list dns '2001:1608:10:25::9249:d69b'
	option device 'wan'
	option reqprefix '56'

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Although I don't see why they would have to ask their clients to do that, this is the right configuration to request a /56 at DHCP6 solicitation.

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thanks, I don't know either, but it's ask in a letter from my isp.

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