OARC's DNS Reply Size Test Server
Recent increases in DNSSEC deployment are exposing problems with DNS resolvers that cannot receive large responses.
The maximum reply size between a DNS server and resolver may be limited by a number of factors:
- If a resolver does not support the Extension Mechanisms for DNS (EDNS), replies are limited to 512 bytes.
- The resolver may be behind a firewall that blocks IP fragments.
- Some DNS-aware firewalls block responses larger than 512 bytes.
DNS-OARC built the DNS Reply Size Test Server to help users identify resolvers that cannot receive large DNS replies.
Web-Link: DNS-ORAC - Website