On Fri, 20 Oct 1995, Curtis Villamizar wrote:
Could you tell us a little more about your packet loss sampling? Like how many ping packets are you using per collection point?
Sure. The program "globalping" takes a list of hosts from the rover hostfile at each RS which contains a list of discovered RS BGP Peers. For each of these peers, the command /usr/rovers/bin/ping -s <peeripaddr> 100 -c 5 is issued and the output parsed and stored in $HOME/delay/delaymatrix.YYMMDD. For example, a sample of today's data at MAE-East in delaymatrix.951023: Mon Oct 23 00:00:01 1995 192.41.177.166 68 1 1 1 192.41.177.6 83 6 7 5 4 192.41.177.140 2 1 1 1 130 192.41.177.145 4 1188 345 7 4 192.41.177.150 3 3 4 3 4 192.41.177.160 2 2 135 2 4 192.41.177.170 3 3 2 2 2 192.41.177.181 2 2 1 73 2 192.41.177.190 108 2 3 2 1 192.41.177.210 2 2 2 2 2 192.41.177.220 3 3 4 3 3 192.41.177.241 2 166 2 2 6 192.41.177.249 4 119 2 1 3 192.41.177.115 2 2 5 2 2 192.41.177.110 1 1 1 1 1 192.41.177.85 4 3 3 3 91 192.41.177.163 2 1 73 1 1 192.41.177.90 2 1 1 1 2 35.1.1.48 33 32 31 31 31 192.41.177.251 4 94 8 7 5 192.41.177.252 7 109 6 4 192.41.177.169 2 1 1 1 2 198.32.130.130 28 27 27 1044 204 198.32.130.131 28 26 35 1044 198 192.157.69.251 11 11 11 11 12 192.157.69.250 18 11 34 12 11 198.32.128.130 85 86 86 198.32.128.131 85 85 86 85 85 198.108.0.10 55 32 31 32 31 Mon Oct 23 00:15:01 1995 : : : I believe for the graphs, Dun removes outliers. We are using the stock Sun ping: rs1.mae-east.ra.net : /usr/users/wbn/delay > ls -l /usr/rovers/bin/ping -rwsr-xr-x 1 root 16446 Oct 9 09:50 /usr/rovers/bin/ping* If you are really interested I installed the globalping source code on home.merit.edu:~ftp/pub/users/norton/globalping.tar, but it is really nothing more than a forker and output parser. Bill ------------------------------------------------------------------------- William B. Norton Merit Network Inc. e-mail: wbn@merit.edu phone: (313) 936-2656 WWW: http://home.merit.edu/~wbn