trans-Atlantic latency?

Security Admin (NetSec) secadmin at
Fri Jun 29 01:41:27 UTC 2007

Sprint has probably the lowest latency in the industry; I use them for a Los Angeles - London IPSec VPN.  Typical latency is around 140-150 ms rt (70-75 ms one-way)

40 ms RT is not possible in this reality, unless the speed of light is increased or one transimits through subspace (see Star Trek)

-----Original Message-----
From: owner-nanog at [mailto:owner-nanog at] On Behalf Of Neal R
Sent: Thursday, June 28, 2007 4:21 PM
To: nanog at
Subject: trans-Atlantic latency?

  I have a customer with IP transport from Sprint and McLeod and fiber
connectivity to Sprint in the Chicago area. The person making the
decisions is not a routing guy but is very sharp overall. He is
currently examining the latency on trans-Atlantic links and has fixed on
the idea that he needs 40ms or less to London through whatever carrier
he picks. He has spoken to someone at Cogent about a point to point link.

    What is a reasonable latency to see on a link of that distance? I
get the impression he is shopping for something that involves dilithium
crystal powered negative latency inducers, wormhole technology, or an
ethernet to tachyon bridge, but its been a long time (9/14/2001, to be
exact) since I've had a trans-Atlantic circuit under my care and things
were different back then.

      Anyone care to enlighten me on what these guys can reasonably
expect on such a link? My best guess is he'd like service from Colt
based on the type of customer he is trying to reach, but its a big
muddle and I don't get to talk to all of the players ...

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