安装dhcpcd

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# 安装dhcpcd
apk add dhcpcd
# 添加dhcpcd服务
rc-update add dhcpcd
# 启动dhcpcd服务
rc-service dhcpcd start

添加路由通告

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cat <<EOF > /etc/sysctl.conf
net.ipv6.conf.all.accept_ra = 2
net.ipv6.conf.default.accept_ra = 2
net.ipv6.conf.eth0.accept_ra = 2
net.ipv6.conf.eth0.autoconf = 1
EOF

添加网卡支持ipv6 dhcp

注：eth0需要更换为自己的网卡名

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cat <<EOF >/etc/network/interfaces
iface eth0 inet6 dhcp
EOF