How to Resolve DNS with "EDNS0" (RFC2671) DNS Servers in Red Hat Enterprise Linux 6.x
Issue
By default, a Red Hat Enterprise Linux system does not communicate with DNS servers configured in accordance with RFC2671 (EDNS0). This causes an inability to resolve DNS against these servers when configured.
Environment
Red Hat Enterprise Linux 6.x server using an EDNS0 DNS server on its network to resolve DNS.
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.