我在路由器后面运行 Ubuntu 16.04。我可以让路由器上的 IPv6 工作，但它在客户端上失败了。如果有人能告诉我如何解决这个问题，我将不胜感激。
我可以使用 SLAAC（radvdump 输出，如下）或 DHCPv6 从 ISP 获取 IP，从而得到基于路由器 WAN 接口的 MAC 加上本地链路的 IP。 ip -6 addr在路由器上显示：
inet6 2607:X:X:X:Y:yff:fey:Y/64 scope global dynamic
然后，我可以将路由器的 LAN 接口设置为静态：2607:X:X:X::/64并使用路由器的无状态或有状态 DHCP 服务器来获取客户端地址（第一个地址仅在使用有状态的服务器）：
inet6 2607:X:X:X::x/128 scope global dynamic
inet6 2607:X:X:X:Y':Y':Y':Y'/64 scope global temporary dynamic
inet6 2607:X:X:X:Z:Z:Z:Z/64 scope global mngtmpaddr noprefixroute dynamic
ip -6 route在客户端上（第一条路线仅在使用有状态的服务器，fe80::Y:yff:fey:Y 是路由器 LAN 接口的链路本地 ip)
2607:X:X:X::x dev enp0s25 proto kernel metric 256 expires 86292sec pref medium
2607:X:X:X::/64 via fe80::Y:yff:fey:Y dev enp0s25 proto ra metric 100 pref medium
2607:X:X:X::/64 dev enp0s25 proto kernel metric 256 expires 7090sec pref medium
fe80::/64 dev enp0s25 proto kernel metric 256 pref medium
default via fe80::Y:yff:fey:Y dev enp0s25 proto static metric 100 pref medium
当路由器设置为使用 ISP 的 DHCP 时，我也可以尝试通过使用前缀委派来省去路由器 LAN 接口的静态设置；但无论我对客户端使用有状态还是无状态 DHCP，我都只能获得一个链路本地地址。这似乎很奇怪，因为前缀/网络掩码包含在 ISP 的路由器广告中（见下文）。
---------------------------------------------
# radvdump[在路由器上运行]
interface ath0
{
AdvSendAdvert on;
# Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
AdvManagedFlag off;
AdvOtherConfigFlag on;
AdvReachableTime 0;
AdvRetransTimer 0;
AdvCurHopLimit 64;
AdvDefaultLifetime 1800;
AdvHomeAgentFlag off;
AdvDefaultPreference medium;
AdvSourceLLAddress on;
RDNSS 2607:X:X:X::53
{
AdvRDNSSPreference 0;
AdvRDNSSOpen off;
AdvRDNSSLifetime 1800;
}; # End of RDNSS definition
prefix 2607:X:Y:Y::/64
{
AdvValidLifetime 2592000;
AdvPreferredLifetime 604800;
AdvOnLink on;
AdvAutonomous on;
AdvRouterAddr off;
}; # End of prefix definition
}; # End of interface definition
#
# radvd configuration generated by radvdump 1.2
# based on Router Advertisement from fe80::Z:Z:Z:Z
# received by interface ath0
/etc/网络/接口与 ubuntu 安装相比没有变化：
auto lo
iface lo inet loopback
我还在这里注意到输出sysctl。 这个答案表示我可能需要更改其中的一些，但其他的则表示更改应该在接口文件和/或网络管理器中进行，并且这些与 sysctl 配合不好。这是连接到 LAN 的 enp0s25 接口：
$ sudo sysctl -a | grep accept_ra
net.ipv6.conf.all.accept_ra = 1
net.ipv6.conf.all.accept_ra_defrtr = 1
net.ipv6.conf.all.accept_ra_from_local = 0
net.ipv6.conf.all.accept_ra_min_hop_limit = 1
net.ipv6.conf.all.accept_ra_mtu = 1
net.ipv6.conf.all.accept_ra_pinfo = 1
net.ipv6.conf.all.accept_ra_rt_info_max_plen = 0
net.ipv6.conf.all.accept_ra_rtr_pref = 1
net.ipv6.conf.default.accept_ra = 1
net.ipv6.conf.default.accept_ra_defrtr = 1
net.ipv6.conf.default.accept_ra_from_local = 0
net.ipv6.conf.default.accept_ra_min_hop_limit = 1
net.ipv6.conf.default.accept_ra_mtu = 1
net.ipv6.conf.default.accept_ra_pinfo = 1
net.ipv6.conf.default.accept_ra_rt_info_max_plen = 0
net.ipv6.conf.default.accept_ra_rtr_pref = 1
net.ipv6.conf.enp0s25.accept_ra = 1
net.ipv6.conf.enp0s25.accept_ra_defrtr = 0
net.ipv6.conf.enp0s25.accept_ra_from_local = 0
net.ipv6.conf.enp0s25.accept_ra_min_hop_limit = 1
net.ipv6.conf.enp0s25.accept_ra_mtu = 1
net.ipv6.conf.enp0s25.accept_ra_pinfo = 0
net.ipv6.conf.enp0s25.accept_ra_rt_info_max_plen = 0
net.ipv6.conf.enp0s25.accept_ra_rtr_pref = 0
net.ipv6.conf.lo.accept_ra = 1
net.ipv6.conf.lo.accept_ra_defrtr = 1
net.ipv6.conf.lo.accept_ra_from_local = 0
net.ipv6.conf.lo.accept_ra_min_hop_limit = 1
net.ipv6.conf.lo.accept_ra_mtu = 1
net.ipv6.conf.lo.accept_ra_pinfo = 1
net.ipv6.conf.lo.accept_ra_rt_info_max_plen = 0
net.ipv6.conf.lo.accept_ra_rtr_pref = 1
net.ipv6.conf.virbr0.accept_ra = 0
net.ipv6.conf.virbr0.accept_ra_defrtr = 1
net.ipv6.conf.virbr0.accept_ra_from_local = 0
net.ipv6.conf.virbr0.accept_ra_min_hop_limit = 1
net.ipv6.conf.virbr0.accept_ra_mtu = 1
net.ipv6.conf.virbr0.accept_ra_pinfo = 1
net.ipv6.conf.virbr0.accept_ra_rt_info_max_plen = 0
net.ipv6.conf.virbr0.accept_ra_rtr_pref = 1
net.ipv6.conf.virbr0-nic.accept_ra = 1
net.ipv6.conf.virbr0-nic.accept_ra_defrtr = 1
net.ipv6.conf.virbr0-nic.accept_ra_from_local = 0
net.ipv6.conf.virbr0-nic.accept_ra_min_hop_limit = 1
net.ipv6.conf.virbr0-nic.accept_ra_mtu = 1
net.ipv6.conf.virbr0-nic.accept_ra_pinfo = 1
net.ipv6.conf.virbr0-nic.accept_ra_rt_info_max_plen = 0
net.ipv6.conf.virbr0-nic.accept_ra_rtr_pref = 1
net.ipv6.conf.wlp3s0.accept_ra = 0
net.ipv6.conf.wlp3s0.accept_ra_defrtr = 0
net.ipv6.conf.wlp3s0.accept_ra_from_local = 0
net.ipv6.conf.wlp3s0.accept_ra_min_hop_limit = 1
net.ipv6.conf.wlp3s0.accept_ra_mtu = 1
net.ipv6.conf.wlp3s0.accept_ra_pinfo = 0
net.ipv6.conf.wlp3s0.accept_ra_rt_info_max_plen = 0
net.ipv6.conf.wlp3s0.accept_ra_rtr_pref = 0