My tunnel (T64949) has been up for a few weeks and suddenly dropped. I can't contact the ipv4 end point either from my tunnel end point or from other hosts on the internet, but I can v6 ping the PoP side of the tunnel. my router: traceroute to 66.117.47.228 (66.117.47.228), 30 hops max, 38 byte packets 1 70.159.160.95 (70.159.160.95) 103.819 ms 113.897 ms 117.079 ms 2 70.159.176.49 (70.159.176.49) 72.022 ms 49.580 ms 53.109 ms 3 70.159.176.38 (70.159.176.38) 51.081 ms 48.524 ms 48.085 ms 4 12.81.16.28 (12.81.16.28) 51.744 ms 51.536 ms 50.373 ms 5 12.81.16.19 (12.81.16.19) 52.019 ms 49.596 ms 47.343 ms 6 74.175.192.62 (74.175.192.62) 52.686 ms 50.017 ms 77.988 ms 7 cr2.attga.ip.att.net (12.122.140.186) 51.495 ms cr1.attga.ip.att.net (12.122.141.186) 52.565 ms cr2.attga.ip.att.net (12.122.140.186) 51.668 ms 8 attga04jt.ip.att.net (12.122.84.113) 50.779 ms attga04jt.ip.att.net (12.122.84.149) 49.978 ms attga04jt.ip.att.net (12.122.84.113) 72.856 ms 9 * * * 10 vlan51.ebr1.Atlanta2.Level3.net (4.69.150.62) 66.159 ms vlan52.ebr2.Atlanta2.Level3.net (4.69.150.126) 49.767 ms 52.455 ms 11 ae-73-73.ebr3.Atlanta2.Level3.net (4.69.148.253) 50.656 ms 50.348 ms 54.527 ms 12 ae-2-2.ebr1.Washington1.Level3.net (4.69.132.86) 93.247 ms 67.300 ms 85.057 ms 13 ae-71-71.csw2.Washington1.Level3.net (4.69.134.134) 69.133 ms ae-91-91.csw4.Washington1.Level3.net (4.69.134.142) 80.757 ms 67.434 ms 14 ae-13-60.car3.Washington1.Level3.net (4.69.149.5) 86.112 ms ae-43-90.car3.Washington1.Level3.net (4.69.149.197) 68.006 ms ae-23-70.car3.Washington1.Level3.net (4.69.149.69) 93.919 ms 15 CARPATHIA-H.car3.Washington1.Level3.net (4.79.169.26) 67.793 ms 75.626 ms 64.225 ms 16 209.222.130.107 (209.222.130.107) 93.002 ms 66.225 ms 79.548 ms 17 * * * 18 * * * 19 * * * another traceroute from a disparate site: traceroute to 66.117.47.228 (66.117.47.228), 64 hops max, 52 byte packets 1 tsrouter.oit.gatech.edu (130.207.167.1) 1.436 ms 1.392 ms 1.313 ms 2 campus2-rtr-130-207-254-37.gatech.edu (130.207.254.37) 1.327 ms 0.813 ms 1.096 ms 3 gateway2-rtr.gatech.edu (130.207.254.185) 1.524 ms 1.562 ms 1.732 ms 4 sox-gw2-rtr.sox.gatech.edu (143.215.194.5) 1.585 ms 1.843 ms 1.705 ms 5 ge3-2.cr02.atl01.pccwbtn.net (198.32.132.30) 20.805 ms 138.946 ms 13.648 ms 6 carpathia.ge12-1.br02.ash01.pccwbtn.net (63.218.94.166) 15.938 ms 15.228 ms 15.577 ms 7 209.222.130.107 (209.222.130.107) 15.807 ms 16.052 ms 16.034 ms 8 * * * 9 * * * 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * *^C I've tried 4 different starting points on 4 different top level ISPs and always drop at 209.222.130.107