Not Working:

traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
1 50.251.249.54 0.242 ms 0.411 ms 0.409 ms
2 96.120.101.113 9.863 ms 9.861 ms 9.853 ms
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *

Working:

traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
1 50.251.249.54 0.448 ms 0.416 ms 0.410 ms
2 96.120.101.113 8.569 ms 8.570 ms 8.562 ms96.120.101.113
3 68.86.99.129 12.775 ms 12.777 ms 14.743 ms
4 69.139.164.129 14.976 ms 15.232 ms 15.212 ms
5 68.86.93.165 17.429 ms 17.427 ms 17.418 ms
6 68.86.84.54 15.164 ms 14.785 ms 14.694 ms
7 66.208.233.242 57.666 ms 49.656 ms 52.087 ms
8 72.14.237.53 10.598 ms 72.14.238.181 6.422 ms 72.14.237.53 9.619 ms
9 209.85.248.139 7.943 ms 209.85.248.117 7.697 ms 10.235 ms
10 8.8.8.8 10.153 ms 10.136 ms 10.122 ms

Anyone with half a brain could see there is a problem between the router at 96.120.101.113 and the one at 68.86.99.129 but Comcast can’t.