Re: Anycast root metrics and analysis

[Harald Alvestrand <Harald@Alvestrand.no>]

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