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- The landmark should be reliable, i.e. up and responding correctly most of the time. Some help may be available by reviewing the reflector logs and the laundering of TULIP Landmarks.
- The landmark should be able to tell whether a target is in the same region or not (see Tier1 Landmark Selection).
- The landmark should have a strong correlation between RTT and distance for targets in its region.
- THe landmark should be able to ping the largest possible number of targets.