Since we conducted similar experiments recently, we would like to share
our methods and results with you.
We have conducted two sets of measurement experiments:
1. the relationships between TTLs and DNS record update frequencies for
different kinds of domains and different kinds of records;
2. the relationships between TTLs and freshness of cached records.
More than 15000 domain names and around 9000 DNS caches were examed in
the first set and second set of experiments.
Our experiments confirmed your concern in the effectiveness of TTL-based
solution. Based on the measurements, we further proposed a new protocol
DNSCUP (DNS Cache Update Protocol) to address this issue.
You can find more information at:
http://www.cs.wm.edu/~xinchen/DNScup.html
Slashdot Mirror
1. the relationships between TTLs and DNS record update frequencies for different kinds of domains and different kinds of records;
2. the relationships between TTLs and freshness of cached records.
More than 15000 domain names and around 9000 DNS caches were examed in the first set and second set of experiments. Our experiments confirmed your concern in the effectiveness of TTL-based solution. Based on the measurements, we further proposed a new protocol DNSCUP (DNS Cache Update Protocol) to address this issue.
You can find more information at: http://www.cs.wm.edu/~xinchen/DNScup.html