Comcast routing contact

Tue Jun 15 19:58:50 UTC 2021

Can someone at AS7922 that handles routing please contact me off list?

Seeing bizarre/asymmetric routing in Houston via Cogent, outbound path goes up to Dallas to reach Cogent transit, then back down to Houston, while (proper) inbound path departs Cogent transit in Houston to hit Comcast. Can’t seem to get someone clueful to investigate through normal support channels.

traceroute to 165.254.62.196 (165.254.62.196), 64 hops max, 52 byte packets

 3  50-225-135-89-static.hfc.comcastbusiness.net (50.225.135.89)  1.038 ms  0.787 ms  0.816 ms
 4  162.151.134.13 (162.151.134.13)  5.531 ms  1.862 ms  1.820 ms
 5  be-33662-cr02.dallas.tx.ibone.comcast.net (68.86.92.61)  9.498 ms  8.177 ms  8.632 ms
 6  be-3312-pe12.1950stemmons.tx.ibone.comcast.net (96.110.34.106)  8.966 ms  8.618 ms  8.671 ms
 7  * * *
 8  be2763.ccr31.dfw01.atlas.cogentco.com (154.54.28.73)  8.934 ms
    be2764.ccr32.dfw01.atlas.cogentco.com (154.54.47.213)  9.816 ms  7.806 ms
 9  be2443.ccr42.iah01.atlas.cogentco.com (154.54.44.229)  11.962 ms  29.051 ms  10.605 ms
10  be2991.rcr51.iah04.atlas.cogentco.com (154.54.7.86)  12.173 ms
    be3777.rcr52.iah04.atlas.cogentco.com (154.54.7.78)  11.716 ms  11.069 ms
11  te0-0-1-3.nr11.b069355-0.iah04.atlas.cogentco.com (154.24.14.186)  12.402 ms  11.591 ms
    te0-0-1-0.nr11.b069355-0.iah04.atlas.cogentco.com (154.24.14.190)  12.384 ms
12  38.122.156.130 (38.122.156.130)  11.028 ms  10.711 ms  10.744 ms
13  * * *
14  165.254.62.196 (165.254.62.196)  13.146 ms  11.642 ms  11.616 ms

traceroute to 50.225.135.90 (50.225.135.90), 30 hops max, 60 byte packets
 1  165.254.62.194 (165.254.62.194)  0.236 ms  0.185 ms  0.153 ms
 2  ve3.r20.sprntx01.mid.net (64.40.23.64)  0.357 ms  0.362 ms  0.406 ms
 3  te0-0-2-1.nr11.b069355-0.iah04.atlas.cogentco.com (38.122.156.129)  1.164 ms  1.277 ms  1.394 ms
 4  te0-2-1-12.rcr51.iah04.atlas.cogentco.com (154.24.14.185)  1.271 ms  1.321 ms  1.290 ms
 5  be3778.ccr42.iah01.atlas.cogentco.com (154.54.85.65)  7.351 ms be2992.ccr42.iah01.atlas.cogentco.com (154.54.27.109)  2.160 ms  7.310 ms
 6  be3494.rcr22.iah02.atlas.cogentco.com (154.54.40.54)  2.261 ms  2.382 ms be3485.rcr21.iah02.atlas.cogentco.com (154.54.28.86)  2.656 ms
 7  be3632.rcr51.b023723-0.iah02.atlas.cogentco.com (154.24.45.58)  3.331 ms be3631.rcr51.b023723-0.iah02.atlas.cogentco.com (154.24.30.38)  3.233 ms be3632.rcr51.b023723-0.iah02.atlas.cogentco.com (154.24.45.58)  3.051 ms
 8  be-200-pe01.westwaypark.tx.ibone.comcast.net (173.167.59.41)  3.003 ms  3.353 ms  3.294 ms
 9  be-3201-cs02.houston.tx.ibone.comcast.net (96.110.39.37)  5.128 ms be-3401-cs04.houston.tx.ibone.comcast.net (96.110.39.61)  5.453 ms  5.392 ms
10  96.110.40.118 (96.110.40.118)  7.344 ms 96.110.40.122 (96.110.40.122)  5.598 ms 96.110.40.118 (96.110.40.118)  7.289 ms
11  96.108.82.66 (96.108.82.66)  10.383 ms  10.696 ms  13.230 ms
12  ae-0-sur03.luthe.tx.houston.comcast.net (68.85.245.117)  10.509 ms  10.590 ms  10.466 ms
13  50-225-135-90-static.hfc.comcastbusiness.net (50.225.135.90)  11.010 ms  10.885 ms  11.004 ms

V/r
Tim