linux – IPv6仅在ping到路由盒后才能工作

我们的网络中只有一个ipv4路由器,每台计算机都连接到它(wifi或有线电视).
具有ipv4和ipv6的服务器也连接到此路由器.服务器已配置隧道经纪人,用于6to4隧道和radvd.网络中的客户端具有正确的前缀,可以通过ipv6互相ping通.但是在他们第一次ping服务器(带有隧道的服务器)之前,他们无法ping到互联网.
我找到了某个地方,这是一个icmp问题,但我找不到解决方案.

问题是路由器只是ipv4吗？

>服务器和客户端运行linux
>路由器运行dd-wrt没有ipv6支持:(

Ping尝试：

standa@standa-laptop:~$ping6 ipv6.google.com
PING ipv6.google.com(2a00:1450:8007::69) 56 data bytes
^C
--- ipv6.google.com ping statistics ---
29 packets transmitted,0 received,100% packet loss,time 28223ms

standa@standa-laptop:~$ping6 2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478
PING 2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478(2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478) 56 data bytes
64 bytes from 2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478: icmp_seq=1 ttl=64 time=3.55 ms
64 bytes from 2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478: icmp_seq=2 ttl=64 time=0.311 ms
64 bytes from 2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478: icmp_seq=3 ttl=64 time=0.269 ms
64 bytes from 2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478: icmp_seq=4 ttl=64 time=0.292 ms
^C
--- 2001:470:XXXX:XXXX:21c:c0ff:fe2b:6478 ping statistics ---
4 packets transmitted,4 received,0% packet loss,time 3000ms
rtt min/avg/max/mdev = 0.269/1.107/3.559/1.415 ms
standa@standa-laptop:~$ping6 ipv6.google.com
PING ipv6.google.com(2a00:1450:8007::69) 56 data bytes
64 bytes from 2a00:1450:8007::69: icmp_seq=1 ttl=57 time=20.7 ms
64 bytes from 2a00:1450:8007::69: icmp_seq=2 ttl=57 time=20.2 ms
64 bytes from 2a00:1450:8007::69: icmp_seq=3 ttl=57 time=23.4 ms
^C
--- ipv6.google.com ping statistics ---
3 packets transmitted,3 received,time 2001ms
rtt min/avg/max/mdev = 20.267/21.479/23.413/1.392 ms

更新：Radvd配置

interface eth0 {
    AdvSendAdvert on;
    MinRtrAdvInterval 3; 
    MaxRtrAdvInterval 10;
    AdvLinkMTU   1280;
    prefix 2001:470:1f0a:1511:1::/64 {
    AdvOnLink on;
    AdvAutonomous on;
    AdvRouterAddr on;
    };
};

更新2：
没有联系

ip -6 neigh
fe80::21c:c0ff:fe2b:6478 dev wlan1 lladdr 00:1c:c0:2b:64:78 router REACHABLE

连接(ping后)

fe80::21c:c0ff:fe2b:6478 dev wlan1 lladdr 00:1c:c0:2b:64:78 router STALE
2001:470:1f0a:1511::1 dev wlan1 lladdr 00:1c:c0:2b:64:78 router REACHABLE

ping时发生邻居请求：

fe80::21c:c0ff:fe2b:6478 2001:470:1f0a:1511:21c:bfff:fe60:b389 ICMPv6 Neighbor solicitation
2001:470:1f0a:1511:21c:bfff:fe60:b389 fe80::21c:c0ff:fe2b:6478 ICMPv6 Neighbor advertisement