It is not symmetrical. 64 bytes from 38.1.2.10: icmp_seq=1 ttl=249 time=273 ms RR: ------------------------- Fddi0/0.San-Jose6.CA.Alter.Net (137.39.27.12) san-jose3.ca.alter.net (198.32.136.42) 38.1.2.16 core.net99.psi.net (38.1.2.10) core.net99.psi.net (38.1.2.10) Fddi0/0.Vienna1.VA.Alter.Net (137.39.11.1) Hssi2/0.Vienna6.VA.Alter.Net (137.39.100.78)
From Alternet to PSI is via MAE-WEST but not vice versa.
Here's the traceroute. Note the large jump in response time at the CIX which confirms the above traceroute to www.psi.net (38.8.8.2), 30 hops max, 40 byte packets 3 Fddi0/0.San-Jose3.CA.Alter.Net (137.39.27.1) 8 ms 9 ms 8 ms 4 mae-west.psi.com (198.32.136.23) 13 ms 13 ms 12 ms 5 38.1.2.14 (38.1.2.14) 86 ms 90 ms 89 ms 6 www.psi.net (38.8.8.2) 91 ms 89 ms 88 ms