DS-lite or DHCPv6 with Cable Modem (DS-lite Unitymedia)

Installing and Using OpenWrt Network and Wireless Configuration
1

I have found these sources below, but I am not sure what setting is required for DS-lite.
My setup is ISP (Kabel BW) --> Cable modem (TC4400) in bridge mode --> OpenWrt Router

Setting DHCPv6 and DHCP on WAN6 and WAN works fine and WAN6_4 is getting generated.
WAN6_4:
Protocol: Virtual dynamic interface (Dual-Stack Lite (RFC6333))
IPv4: 192.0.0.2/32

Network config is as follows:

config interface 'wan'
        option proto 'dhcp'
        option ifname 'eth0.2'

config interface 'wan6'
        option ifname 'eth0.2'
        option proto 'dhcpv6'
        option reqaddress 'try'
        option reqprefix 'auto'

http://ipv6-test.com/ also looks fine, I have proper IPv6 and IPv4.

But I am wondering if I need the Interface Protocol "Dual Stack Lite"?

https://bugs.openwrt.org/index.php?do=details&task_id=1501&pagenum=2

2

I went through the same process.

Didn't need to setup a WAN interface at all. Once the ds-lite package is installed, it'll create a ds-wan6_4 interface.

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