I rebooted my router over the weekend so I could add a third interface. When it came back online, I found that I could no longer access the IPv6 internet from connected clients. I backed out what I had done over the weekend, but nothing changed. I'm sure it's something small I'm overlooking, but I think I've just been looking at it too long. I can ping the IPv6 internet from my router, and it is routing internally between subnets, which leads me to believe that I have a missing/incorrect line in my routing table. From the router: [carl@ipv6router ~]$ ping6 ipv6.google.com PING6(56=40+8+8 bytes) 2001:4978:f:22e::2 --> 2001:4860:b002::68 16 bytes from 2001:4860:b002::68, icmp_seq=0 hlim=58 time=63.970 ms 16 bytes from 2001:4860:b002::68, icmp_seq=1 hlim=58 time=67.814 ms 16 bytes from 2001:4860:b002::68, icmp_seq=2 hlim=58 time=65.755 ms ^C --- ipv6.l.google.com ping6 statistics --- 3 packets transmitted, 3 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 63.970/65.846/67.814/1.571 ms Does not work from my PC: C:\Users\cholzhauer>ping -6 ipv6.google.com Pinging ipv6.l.google.com [2001:4860:b002::68] from 2001:4978:1d8:f000:c883:5609 :1aaf:a32f with 32 bytes of data: Request timed out. Request timed out. Here is the output of ipconfig on my machine: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : IPv6 Address. . . . . . . . . . . : 2001:4978:1d8:f000:2501:5c0b:3927:f082 Temporary IPv6 Address. . . . . . : 2001:4978:1d8:f000:c883:5609:1aaf:a32f Link-local IPv6 Address . . . . . : fe80::2501:5c0b:3927:f082%10 IPv4 Address. . . . . . . . . . . : 192.168.100.192 Subnet Mask . . . . . . . . . . . : 255.255.254.0 Default Gateway . . . . . . . . . : fe80::20e:cff:feda:59db%10 192.168.100.1 Here is ifconfig on the router [carl@ipv6router ~]$ ifconfig fwe0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=8<VLAN_MTU> ether 02:e0:18:06:fc:23 ch 1 dma -1 fwip0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500 lladdr 0.e0.18.0.0.6.fc.23.a.2.ff.fe.0.0.0.0 fxp0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=8<VLAN_MTU> ether 00:e0:18:9e:55:66 media: Ethernet autoselect (100baseTX <full-duplex>) status: active em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> ether 00:1b:21:2e:0f:ca inet6 fe80::21b:21ff:fe2e:fca%em0 prefixlen 64 scopeid 0x4 inet 192.168.102.46 netmask 0xfffffe00 broadcast 192.168.103.255 inet6 2001:4978:1d8:e000:21b:21ff:fe2e:fca prefixlen 64 inet6 2001:4978:1d8:e000:: prefixlen 64 anycast inet6 2001:4978:1d8:e000::9 prefixlen 64 media: Ethernet autoselect (1000baseTX <full-duplex>) status: active em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> ether 00:0e:0c:da:59:db inet6 fe80::20e:cff:feda:59db%em1 prefixlen 64 scopeid 0x5 inet 192.168.100.10 netmask 0xfffffe00 broadcast 192.168.101.255 inet6 2001:4978:1d8:f000:20e:cff:feda:59db prefixlen 64 inet6 2001:4978:1d8:f000:: prefixlen 64 anycast inet6 2001:4978:1d8:f000::9 prefixlen 64 media: Ethernet autoselect (1000baseTX <full-duplex>) status: active plip0: flags=108810<POINTOPOINT,SIMPLEX,MULTICAST,NEEDSGIANT> metric 0 mtu 1500 lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x7 inet 127.0.0.1 netmask 0xff000000 tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1280 inet6 fe80::2e0:1800:6:fc23%tun0 prefixlen 64 scopeid 0x8 inet6 fe80::4878:f:22e:2%tun0 prefixlen 64 scopeid 0x8 inet6 2001:4978:f:22e::2 --> 2001:4978:f:22e::1 prefixlen 128 Opened by PID 926 Here is part of the output of netstat -nr: Internet6: Destination Gateway Flags Netif Expire ::/96 ::1 UGRS lo0 => default 2001:4978:f:22e::1 UGS tun0 ::1 ::1 UHL lo0 ::ffff:0.0.0.0/96 ::1 UGRS lo0 2001:4978:f:22e::1 link#8 UHL tun0 2001:4978:f:22e::2 link#8 UHL lo0 2001:4978:1d8:e000:: 00:1b:21:2e:0f:ca UHL lo0 => 2001:4978:1d8:e000::/64 link#4 UC em0 2001:4978:1d8:e000::9 00:1b:21:2e:0f:ca UHL lo0 2001:4978:1d8:e000:20c:29ff:fe00:48b5 00:0c:29:00:48:b5 UHLW em0 2001:4978:1d8:e000:216:e6ff:fe8d:d8f4 00:16:e6:8d:d8:f4 UHLW em0 2001:4978:1d8:e000:216:e6ff:fe8d:d8f5 00:16:e6:8d:d8:f5 UHLW em0 2001:4978:1d8:e000:21b:21ff:fe2e:fca 00:1b:21:2e:0f:ca UHL lo0 2001:4978:1d8:e000:2e0:81ff:fe48:f8de 00:e0:81:48:f8:de UHLW em0 2001:4978:1d8:e000:2e0:81ff:fe48:f8df 00:e0:81:48:f8:df UHLW em0 2001:4978:1d8:e000:2e0:81ff:fe48:f940 00:e0:81:48:f9:40 UHLW em0 2001:4978:1d8:e000:2e0:81ff:fe48:f941 00:e0:81:48:f9:41 UHLW em0 2001:4978:1d8:e000:41bd:d9bf:9b66:9b95 00:e0:81:75:28:26 UHLW em0 2001:4978:1d8:e000:88cb:fe1b:c4b0:92a1 00:e0:81:79:f4:c4 UHLW em0 2001:4978:1d8:f000:: 00:0e:0c:da:59:db UHL lo0 => 2001:4978:1d8:f000::/64 link#5 UC em1 2001:4978:1d8:f000::9 00:0e:0c:da:59:db UHL lo0 2001:4978:1d8:f000:20e:cff:feda:59db 00:0e:0c:da:59:db UHL lo0 Relevant part of /etc/rc.conf: ipv6_enable="YES" ipv6_defaultrouter="2001:4978:f:22e::1" ipv6_network_interfaces="em1 em0" ipv6_gateway_enable="YES" ipv6_ifconfig_em1="2001:4978:1d8:f000::9" ipv6_ifconfig_em0="2001:4978:1d8:e000::9" ipv6_prefix_em1="2001:4978:1d8:f000" ipv6_prefix_em0="2001:4978:1d8:e000" rtadvd_enable="YES" rtadvd_interfaces="em1 em0" sixxs_aiccu_enable="YES" Even though I don't think it's needed, here's /etc/rtadvd.conf: [carl@ipv6router ~]$ cat /etc/rtadvd.conf em1:\ :addrs#1:addr="2001:4978:1d8:f000::":prefixlen#64:tc=ether: em0:\ :addrs#1:addr="2001:4978:1d8:e000::":prefixlen#64:tc=ether: