[e2e] TCP, retransmissions, and ISPs with byte caps

[Simon Leinen]

>>>>> On Tue, 18 Jun 2002 08:57:18 -0400, "David P. Reed" <dpreed at reed.com> said:
> At 08:17 AM 6/18/2002 +0200, Philippe Strauss wrote:
>> But about delays, CATV systems have an interesting characeristic:
>> a ~20ms minimum delay in the ACK path (direction from home
>> to the hub, upstream or return path in catv speak).
[...]
> Perhaps you meant 20 *micro* seconds?

> Or maybe Swiss cable systems are really really slow.

Hm, I'm using what is probably the prevalent Cable ISP in Switzerland
(Cablecom).  I think they are using DOCSIS 1.1, my cable "modem" is a
Cisco CVA-122(E?).  The results are quite similar to yours
(when I replace MIT by its Swiss counterpart :-).

: leinen at diotima[leinen]; mtr -r www.ethz.ch
HOST                                    LOSS  RCVD SENT    BEST     AVG   WORST
10.224.96.1                               0%    16   16    5.93    8.02   16.93
62.2.24.221                               0%    16   16    5.67    6.81    9.16
62.2.6.34                                 0%    16   16    6.59    8.00   11.82
switix-f1-0.switch.ch                     0%    16   16    6.85    8.66   13.24
swiEZ2-G3-2.switch.ch                     0%    16   16    7.15    8.35   10.12
rou-eth-switch-1-giga-to-switch.ethz.ch   0%    16   16    7.11    8.51   11.06
rou-rz-1-mega-transit.ethz.ch             0%    16   16    7.19    8.59   11.57
w3.ethz.ch                                0%    16   16    6.79    8.33   12.72
-- 
Simon.