To:
Mark.Andrews@nominum.com, Robert Elz <kre@munnari.OZ.AU>
Cc:
hardie@equinix.com, dnsop@cafax.se, aroot@ops.ietf.org
From:
Harald Alvestrand <Harald@Alvestrand.no>
Date:
Fri, 03 Nov 2000 11:11:23 +0100
In-Reply-To:
<200011022150.eA2LoPc53206@drugs.dv.isc.org>
Sender:
owner-dnsop@cafax.se
Subject:
Re: Anycast root metrics and analysis
At 08:50 03/11/2000 +1100, Mark.Andrews@nominum.com wrote:
> The root server operators can easily measure the losses at the
> server (if any). It's much harder for them to see the losses
> in the network servicing the root servers.
OTOH, measuring this loss is easy for the end users.
Here's losses measured from a site in Norway for the .in-addr.arpa server set:
1271 samples
Server Samp % Min Ave Max 0 1.0 2.0 3.0 4.0 5.0 6.0
A.ROOT-SERVERS.NET 1238 97.40 138 311 5256
1204 34
B.ROOT-SERVERS.NET 1241 97.64 205 669 5659
1148 2 91
C.ROOT-SERVERS.NET 1170 92.05 145 917 5621
1032 138
D.ROOT-SERVERS.NET 1262 99.29 138 217 5360
1255 7
E.ROOT-SERVERS.NET 119 9.36 212 224 248 119
F.ROOT-SERVERS.NET 1230 96.77 195 255 5274
1223 7
G.ROOT-SERVERS.NET 1129 88.83 177 1344 5924 888 2 239
H.ROOT-SERVERS.NET 1116 87.80 164 1413 5946 896 220
I.ROOT-SERVERS.NET 1228 96.62 31 120 5509
1207 2 1 18
The stuff at +5 seconds is the part that needed a retransmission.
And here are the numbers for the .com servers:
1558 samples
Server Samp % Min Ave Max 0 1.0 2.0 3.0 4.0 5.0 6.0
A.GTLD-SERVERS.NET 1493 95.83 137 190 5232
1486 1 6
A.ROOT-SERVERS.NET 1504 96.53 137 261 5443
1476 1 27
B.GTLD-SERVERS.NET 1503 96.47 200 372 5532
1488 1 14
C.GTLD-SERVERS.NET 1471 94.42 138 191 5999
1463 2 6
D.GTLD-SERVERS.NET 890 57.12 203 340 5552 874 1 15
E.GTLD-SERVERS.NET 1463 93.90 194 243 5220
1457 6
F.GTLD-SERVERS.NET 1476 94.74 196 259 5340
1468 8
F.ROOT-SERVERS.NET 594 38.13 195 239 5212 592 2
G.GTLD-SERVERS.NET 1496 96.02 137 199 5220
1486 10
I.GTLD-SERVERS.NET 1380 88.58 22 430 5216
1286 94
J.GTLD-SERVERS.NET 1483 95.19 137 267 6519
1475 7 1
K.GTLD-SERVERS.NET 1480 94.99 57 553 5616
1338 9 133
M.GTLD-SERVERS.NET 1453 93.26 358 518 7698
1418 6 2 1 25 1
The reason for the abysmal response here on f.root-servers.net is that it
was dropped from the .com server set while the test was running.
e.root-servers.net gets "host unreachable" from Stockholm; I don't know why.
harald
--
Harald Tveit Alvestrand, alvestrand@cisco.com
+47 41 44 29 94
Personal email: Harald@Alvestrand.no