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先在配置文件内禁用ipv6 dhcp服务：

/etc/config/dhcp 
config dhcp 'lan'
        option interface 'lan'
        option start '150'
        option limit '100'
        option leasetime '12h'
        option ra 'disabled'
        option dhcpv6 'disabled'

config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'
        option loglevel '4'

关闭odhcpd:

/etc/init.d/odhcpd stop
/etc/init.d/odhcpd disable

修改dnsmasq配置文件开启ra服务：

/etc/dnsmasq.conf 
enable-ra
dhcp-range=::,constructor:br-lan,ra-only
#其它slaac ra-stateless等参考man文档

只想通过ipv4查询dns，下面patch让dnsmasq无状态分配ip时候不包含RDNSS，这样客户端只配置ipv4 dns而不配置ipv6 dns。

diff -urN dnsmasq-2.86/src/radv.c dnsmasq-2.86-bak/src/radv.c
--- dnsmasq-2.86/src/radv.c     2021-09-09 04:21:22.000000000 +0800
+++ dnsmasq-2.86-bak/src/radv.c 2022-01-23 11:57:01.818963642 +0800
@@ -507,7 +507,7 @@
        }
     }
 
-  if (daemon->port == NAMESERVER_PORT && !done_dns && parm.link_pref_time != 0)
+  if ( 0 && daemon->port == NAMESERVER_PORT && !done_dns && parm.link_pref_time != 0)
     {
       /* default == us, as long as we are supplying DNS service. */
       put_opt6_char(ICMP6_OPT_RDNSS);

odhcpd新版本参数dns_service也可实现此需求，不使用dhcpv6可尝试使用ra_dns参数关闭ra dns？
再次开启ipv6 dns服务，如果有配置dhcp6 dns服务器，dnsmasq会将其设置为RDNSS:

dhcp-option=option6:dns-server,[xxxx:xxxx:xxxx:xxxx::1]

Proxmox安装后默认没有通过SLAAC配置公网ipv6地址，使用debian/ubuntu的方法配置ipv6提示错误不支持的方法auto。

iface vmbr0 inet6 auto

原来Proxmox使用的是ifupdown2，非debian/ubuntu使用ifupdown。

查看内核也已经开启ipv6自动配置：

cat /proc/sys/net/ipv6/conf/vmbr0/accept_ra
1
cat /proc/sys/net/ipv6/conf/vmbr0/autoconf 
1

查看已开启ipv6转发：

cat /proc/sys/net/ipv6/conf/vmbr0/forwarding 
1

需要将accept_ra值改成2才能自动配置SLAAC ipv6地址：

/etc/sysctl.conf
net.ipv6.conf.all.accept_ra=2
net.ipv6.conf.default.accept_ra=2
net.ipv6.conf.vmbr0.accept_ra=2
net.ipv6.conf.all.autoconf=1
net.ipv6.conf.default.autoconf=1
net.ipv6.conf.vmbr0.autoconf=1

参考：
https://github.com/CumulusNetworks/ifupdown2/issues/178#issuecomment-725558706
https://www.starduster.me/2020/02/19/talk-about-slaac-on-linux-principle-configuration-and-behavior/

和HE服务器建立IPV6 Tunnel连接：

/interface 6to4 add name=he-ipv6 remote-address=216.218.221.6 local-address=111.111.11.1 disabled=no 

ROS添加HE分配的IPV6地址：

/ipv6 address add address=2001:470:18:5da::2/64 advertise=yes disabled=no eui-64=no interface=he-ipv6 

ROS添加默认IPV6路由：

/ipv6 route add disabled=no dst-address=::/0 gateway=he-ipv6

测试IPV6：

ping 2404:6800:4008:c01::65                                                                                                                       
2404:6800:4008:c01::65                     56  58 396ms echo reply