IP-6路由在Linux中累积条目是正常的吗？

Question

在通过路由器的radvd广告隧道连接到ipv6 internet的Linux机器上，ip -6 route积累了最近的地址。这一切为什么要发生？它是预期的行为，还是机器配置错误？在直接连接到ipv6隧道的另一台计算机上，ip -6 route保持较短的列表。

在客户端(将最近的地址作为路由进行累积)：

ip -6 route # after pinging ipv6.google.com and www.kame.net

2001:200:dff:fff1:216:3eff:feb1:44d7 via fe80::216:1ff:fe14:444 dev eth0  proto static  metric 1024 
2001:470:8:e7c::/64 dev eth0  proto kernel  metric 256  expires 86407sec
2607:f8b0:4002:801::1011 via fe80::216:1ff:fe14:444 dev eth0  proto static  metric 1024 
fe80::/64 dev eth0  proto kernel  metric 256 
default via fe80::216:1ff:fe14:444 dev eth0  proto kernel  metric 1024 

在路由器上：

    ip -6 route
    ::/96 via :: dev tun6to4  metric 256  mtu 1280 advmss 1220
    2001:470:7:e7c::/64 via :: dev he-ipv6  metric 256  mtu 1480 advmss 1420
    2001:470:8:e7c::/64 dev br0  metric 256  mtu 1500 advmss 1440
    2002:62b4:2270:1::/64 dev br0  metric 256  mtu 1500 advmss 1440
    2002::/16 dev tun6to4  metric 256  mtu 1280 advmss 1220
    2000::/3 dev he-ipv6  metric 1024  mtu 1480 advmss 1420
    fe80::/64 dev eth0  metric 256  mtu 1500 advmss 1440
    fe80::/64 dev vlan0  metric 256  mtu 1500 advmss 1440
    fe80::/64 dev eth1  metric 256  mtu 1500 advmss 1440
    fe80::/64 dev br0  metric 256  mtu 1500 advmss 1440
    fe80::/64 dev vlan1  metric 256  mtu 1500 advmss 1440
    fe80::/64 via :: dev he-ipv6  metric 256  mtu 1480 advmss 1420
    fe80::/64 dev tun6to4  metric 256  mtu 1280 advmss 1220
    ff00::/8 dev eth0  metric 256  mtu 1500 advmss 1440
    ff00::/8 dev vlan0  metric 256  mtu 1500 advmss 1440
    ff00::/8 dev eth1  metric 256  mtu 1500 advmss 1440
    ff00::/8 dev br0  metric 256  mtu 1500 advmss 1440
    ff00::/8 dev vlan1  metric 256  mtu 1500 advmss 1440
    ff00::/8 dev he-ipv6  metric 256  mtu 1480 advmss 1420
    ff00::/8 dev tun6to4  metric 256  mtu 1280 advmss 1220
    default dev he-ipv6  metric 1024  mtu 1480 advmss 1420

ip -6 a
1: lo: <LOOPBACK,MULTICAST,UP>
    inet6 ::1/128 scope host
3: eth0: <BROADCAST,MULTICAST,PROMISC,UP>
    inet6 fe80::216:1ff:fe14:444/64 scope link
4: eth1: <BROADCAST,MULTICAST,PROMISC,UP>
    inet6 fe80::216:1ff:fe14:446/64 scope link
5: vlan0: <BROADCAST,MULTICAST,PROMISC,UP>
    inet6 fe80::216:1ff:fe14:444/64 scope link
6: vlan1: <BROADCAST,MULTICAST,UP>
    inet6 fe80::216:1ff:fe14:445/64 scope link
8: br0: <BROADCAST,MULTICAST,PROMISC,UP>
    inet6 fe80::216:1ff:fe14:444/64 scope link
    inet6 2002:62b4:2270:1::1/64 scope global
    inet6 2001:470:8:e7c::1/64 scope global
12: he-ipv6: <POINTOPOINT,NOARP,UP>
    inet6 2001:470:7:e7c::2/64 scope global
    inet6 fe80::62b4:2270/128 scope link
13: tun6to4: <NOARP,UP>
    inet6 2002:62b4:2270::1/16 scope global
    inet6 ::98.180.34.112/128 scope global

radvd.conf：

interface br0 {
AdvSendAdvert on;
prefix 2001:470:8:e7c::/64 {
AdvOnLink on;
AdvAutonomous on;
AdvRouterAddr off;
};
};

Answer 1

我怀疑这里发生的事情是路由器在2001:888:0:18::范围内没有地址，所以路由器使用它的链接本地地址(fe80::444)广播它的路由广告。

由于fe80::范围与特定接口没有关联，因此客户端机器需要跟踪向fe80::444发送数据包时使用哪个接口，因此它向路由表中添加了一个条目。

如果你的路由器在同一个网络上找到一个地址，比如说2001:888:0:18::1，我怀疑这种行为可能会改变。