在 V2EX 潜伏很久了，第一次发帖，请 IPV6 相关大咖帮忙瞄一眼 pptpd+teredo 的问题

第一次发帖，求关注 这个应该归为路由器吧，， 直入正文吧，我用一台 Ubuntu 16.04 LTS 做为 PPTPD 服务器，上面装了 teredo 获取到 IPV6 地址，如图： 传不了图我给文字吧：

teredo Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet6 addr: 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79/32 Scope:Global inet6 addr: fe80::ffff:ffff:ffff/64 Scope:Link UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1280 Metric:1 RX packets:79 errors:0 dropped:0 overruns:0 frame:0 TX packets:313 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:8010 (8.0 KB) TX bytes:24578 (24.5 KB) 

pptpd 服务器和 radvd,tdhcp 均已按照 google 配置好，以下是 ppp0 的情况：

ppp0 Link encap:Point-to-Point Protocol inet addr:192.168.213.1 P-t-P:192.168.213.3 Mask:255.255.255.255 inet6 addr: fe80::2/10 Scope:Link inet6 addr: 2001:0:53aa:64c:f443:5fbb:93e3:f0e1/128 Scope:Global UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1400 Metric:1 RX packets:1894 errors:0 dropped:0 overruns:0 frame:0 TX packets:2395 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:248168 (248.1 KB) TX bytes:873012 (873.0 KB) 

但是，在 ppp0 下面，ping fe80::2 是通的，其他非本机地址全部超时， 在 Ubuntu 上执行 tcpdump 抓包看到，ICMP6 能传递到 teredo 网卡上发出去，也有 ICMP6 的回应，可是 ppp0 却收不到回应，仿佛给 Ubuntu 吃了一样，以下是抓包数据

root@ubuntu:/etc# tcpdump -t -vv ip6 -i teredo tcpdump: listening on teredo, link-type RAW (Raw IP), capture size 262144 bytes IP6 (hlim 63, next-header ICMPv6 (58) payload length: 40) 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 622 IP6 (hlim 63, next-header ICMPv6 (58) payload length: 40) 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 623 IP6 (flowlabel 0x97b84, hlim 56, next-header ICMPv6 (58) payload length: 40) 2401:3800:4001:807::1018 > 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79: [icmp6 sum ok] ICMP6, echo reply, seq 623 IP6 (flowlabel 0x97b84, hlim 56, next-header ICMPv6 (58) payload length: 40) 2401:3800:4001:807::1018 > 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79: [icmp6 sum ok] ICMP6, echo reply, seq 622 IP6 (hlim 63, next-header ICMPv6 (58) payload length: 40) 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 624 IP6 (flowlabel 0x97b84, hlim 56, next-header ICMPv6 (58) payload length: 40) 2401:3800:4001:807::1018 > 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79: [icmp6 sum ok] ICMP6, echo reply, seq 624 IP6 (hlim 63, next-header ICMPv6 (58) payload length: 40) 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 625 IP6 (flowlabel 0x97b84, hlim 56, next-header ICMPv6 (58) payload length: 40) 2401:3800:4001:807::1018 > 2001:0:53aa:64c:1c11:e8c7:8bfe:ad79: [icmp6 sum ok] ICMP6, echo reply, seq 625 ^C 

root@ubuntu:/home/hp# tcpdump -t -i ppp0 -vv ip6 tcpdump: listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes IP6 (hlim 64, next-header ICMPv6 (58) payload length: 40) 213:0:53aa:64c:f443:5fbb:93e3:f0e1 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 622 IP6 (hlim 64, next-header ICMPv6 (58) payload length: 40) 213:0:53aa:64c:f443:5fbb:93e3:f0e1 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 623 IP6 (hlim 64, next-header ICMPv6 (58) payload length: 40) 213:0:53aa:64c:f443:5fbb:93e3:f0e1 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 624 IP6 (hlim 64, next-header ICMPv6 (58) payload length: 40) 213:0:53aa:64c:f443:5fbb:93e3:f0e1 > 2401:3800:4001:807::1018: [icmp6 sum ok] ICMP6, echo request, seq 625 ^C 

路由信息

root@ubuntu:/home/hp# ip -6 route 213:0:53aa:64c:f443:5fbb:93e3:f0e1 dev ppp0 proto kernel metric 256 mtu 1400 pref medium 2001:0:53aa:213:7463:dbeb:eead:ac94 dev ppp3 proto kernel metric 256 mtu 1400 pref medium 2001:0:53aa:213:ac16:729a:bdd8:225f dev ppp2 metric 1024 pref medium 2001::/32 dev teredo proto kernel metric 256 pref medium fe80::/64 dev teredo proto kernel metric 256 pref medium fe80::/10 dev ppp0 metric 1 mtu 1400 pref medium fe80::/10 dev ppp0 proto kernel metric 256 mtu 1400 pref medium default dev teredo metric 1029 pref medium 

root@ubuntu:/home/hp# route -6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If 213:0:53aa:64c:f443:5fbb:93e3:f0e1/128 :: U 256 0 0 ppp0 2001::/32 :: U 256 5 22 teredo fe80::/64 :: U 256 0 0 teredo fe80::/10 :: U 1 1 7 ppp0 fe80::/10 :: U 256 0 0 ppp0 ::/0 :: U 1029 7 70 teredo ::/0 :: !n -1 1 2220 lo ::1/128 :: Un 0 9 44 lo 213:0:53aa:64c:f443:5fbb:93e3:f0e1/128 :: Un 0 2 21 lo 2001::/128 :: Un 0 1 0 lo fe80::/128 :: Un 0 1 0 lo fe80::/128 :: Un 0 1 0 lo fe80::/128 :: Un 0 1 0 lo fe80::/128 :: Un 0 1 0 lo fe80::/128 :: Un 0 1 0 lo fe80::/128 :: Un 0 1 0 lo fe80::2/128 :: Un 0 1 0 lo fe80::2/128 :: Un 0 1 0 lo fe80::ffff:ffff:ffff/128 :: Un 0 1 0 lo fe80::f443:5fbb:93e3:f0e1/128 :: Un 0 1 0 lo ff00::/8 :: U 256 4 2096 ens39 ff00::/8 :: U 256 1 2267 ens33 ff00::/8 :: U 256 0 0 ens38 ff00::/8 :: U 256 0 0 teredo ff00::/8 :: U 256 4 37 ppp0 ::/0 :: !n -1 1 2220 lo 

另外，我试验过，在 Ubuntu 上 ping ppp0 的 Global 地址，响应时间是<1ms,ping ppp0 的 ipv4 是 2ms，我推测是 lo 把数据包吃了，，，求大佬们指点，搞这个玩意两星期了。。谷歌查的前几页都眼熟了，，