FYI, EDNS0 (Extension mechanisms for DNS) is supported by most clients and allows for large UDP packets (configurable to MTU) and includes other extensions. Com

FYI, EDNS0 (Extension mechanisms for DNS) is supported by most clients and allows for large UDP packets (configurable to MTU) and includes other extensions. Common uses for > 512 byte packets are records that include several entries of both A and AAAA type, as well as all DNSSEC replies. It's from RFC2671 proposed in 1999. The only snag is that some consumer firewalls still don't support > 512 bytes when proxying DNS. http://en.wikipedia.org/wiki/Extension_mechanisms_for_DNS http://en.wikipedia.org/wiki/Extension_mechanisms_for_DNS