North American Network Operators Group|
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Re: Possible explanations for a large hop in latency
When I asked ATT about the sudden latency jump I see in traceroutes, they told me it was due to how their MPLS network is setup.
Frank Bulk wrote:
Our upstream provider has a connection to AT&T (18.104.22.168) where I relatively consistently measure with a RTT of 15 msec, but the next hop (22.214.171.124) comes in with a RTT of 85 msec. Unless AT&T is sending that traffic over a cable modem or to Europe and back, I can't see a reason why there is a consistent ~70 msec jump in RTT. Hops farther along the route are just a few msec more each hop, so it doesn't appear that 126.96.36.199 has some kind of ICMP rate-limiting.