26 Jun
2008
26 Jun
'08
7:58 p.m.
Deep Packet Inspection engine delay. <G> On Jun 26, 2008, at 6:51 PM, Frank Bulk wrote:
Our upstream provider has a connection to AT&T (12.88.71.13) where I relatively consistently measure with a RTT of 15 msec, but the next hop (12.122.112.22) 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 12.122.112.22 has some kind of ICMP rate-limiting.
Is this a real performance issue, or is there some logical explanation?
Frank
James R. Cutler james.cutler@consultant.com