...
| Panel |
|---|
Location: in the form City_Country_Type (the only Type currently is PL=PlanetLab) |
Tiering
To reduce the network impact we also break the landmarks into two tiers. Tier0 landmarks are used to identify the region for the target. Then tier1 hosts for that region can be used to more exactly locate the target. Tier0 hosts are chosen as being at the edges of the region, being well connected, highly reliable and quick to respond. We currently only define tier0 hosts for North America and Europe. In other regions all the landmarks are regarded as tier0. There are about 8 tier0 hosts for North America and 4 for Europe. This reduces the number of landmarks to make measurements from with a tier0 request since there are over 100 landmarks in either North America or Europe.
Responses
The responses appear as:
Landmark=http://128.6.192.158, Client=134.79.117.29, failed to connect response code 500.29, failed to connect response code 500
Landmark=http://141.149.218.208, Client=134.79.117.29, 10 packets transmitted, 0 received, 100% packet loss, rtt min/avg/max = 0/0/0
Landmark=http://141128.149193.21833.2087, Client=134.79.117.29, 10 packets transmitted, 0 10 received, 100% 0% packet loss, rtt min/avg/max = 0/0/0
Landmark=http://128.193.33.729.178/29.2495/29.316
Landmark=http://pinger.fnal.gov/cgi-pub/traceroute.pl?function=ping&target=134.79.16.9
, Client=134.79.117.2957, 10 5 packets transmitted, 10 \
5 received, 0% packet loss, rtt min/avg/max = 29.178/29.2495/29.31652/52/53
The first 3 response are from PlanetLab landmarks and the latter is from a SLAC type landmark.
Errors Reported by PlanetLab
...