It would be very interesting in seeing the difference in DNS traffic for a domain if it sets TTL to let's say 600 seconds or 86400 seconds. This could perhaps be used as a metric in trying to figure out the impact of capping the TTL? Anyone know if anyone did this on a large domain and have some data to share?
there is some good analysis in the classic paper @inproceedings{ dnscache:sigcommimw01, title = {DNS Performance and the Effectiveness of Caching}, author = {Jaeyeon Jung, Emil Sit, Hari Balakrishnan and Robert Morris}, booktitle = {Proceedings of the {ACM} {SIGCOMM} Internet Measurement Workshop '01}, year = 2001, month = {November}, address = {San Francisco, California}, url = {citeseer.ist.psu.edu/jung01dns.html} } randy