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先通过web或修改配置添加wifi guest访客网络，network配置，通过mtk管理界面添加的无线接口要添加到网桥：

config globals 'globals'
        option ula_prefix 'xxxx:xxxx:xxxx::/48'

config interface 'guest'
        option proto 'static'
        option ipaddr '10.0.100.1'
        option netmask '255.255.255.0'
        option device 'br-guest'
        option ip6assign '64'
        #分配的前缀,即xxxx:xxxx:xxxx:10::/64
        option ip6hint 10
        #只分配ula_prefix定义的私网,如果pppoe能分配60或以上可以不配置此选项分配私网和wan_6公网                                                                                                                                                                                                                             
        list ip6class local

config device
        option type 'bridge'
        option name 'br-guest'
        list ports 'ra1'
        list ports 'rax1'

通过openwrt原生无线管理添加的接口要添加到指定网络无需额外添加到网桥：

config wifi-iface 'wifinet3'
        option device 'MT7986_1_1'
        option mode 'ap'
        option ssid '2.4G-guest'
        option encryption 'psk-mixed'
        option key 'www.haiyun.me'
        option network 'guest'

dhcp配置：

config dhcp 'guest'                
        option interface 'guest'
        option start '150'
        option limit '100'            
        option leasetime '12h'     
        option dhcpv4 'server'
        list ra_flags 'none'
        option dns_service '0'        
        option ra_default '2' #强制通告ipv6路由给客户端     
        option ra 'server'
        option ra_maxinterval '120'
        option ra_ra_mininterval '60' 
        option ra_lifetime '1200' 
        option ra_useleasetime '1'
        option preferred_lifetime '10m'

iptables配置：

ip6tables -A INPUT -i br-guest -p icmpv6 -j ACCEPT
ip6tables -A FORWARD -i br-guest -o pppoe-wan -j ACCEPT
ip6tables -t nat -A POSTROUTING -s xxxx:xxxx:xxxx:10::/64 -o pppoe-wan -j MASQUERADE

当pppoe成功获取ipv6时添加ipv6默认路由：

echo 'ip -6 rou add default via $LLREMOTE dev $IFNAME' >> /lib/netifd/ppp6-up 

如果是dhcp获取添加hotplug设置ipv6默认路由：

#!/bin/bash
if [ $ACTION = "ifup" -a "$INTERFACE" = "wan6" ]; then
   ip -6 rou add default via fe80::1 dev eth1
fi

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