compreendendo o log de consulta bind9

Question

Estou executando dois servidores de ligação, um registro de consulta ativado, mas não sei exatamente o que vejo aqui e não encontro nada na web que me ilumine;

31-Oct-2017 17:56:35.464 queries: client x.x.x.x#55638: query: test.example.com IN A +
31-Oct-2017 17:56:35.464 queries: client x.x.x.x#55638: query: test.example.com IN A +
31-Oct-2017 16:34:07.505 queries: client x.x.x.x#2968: query: test.example.com IN A -ED
31-Oct-2017 16:45:23.316 queries: client x.x.x.x#36192: query: test.example.com IN A -EDC
31-Oct-2017 18:02:12.711 queries: client x.x.x.x#37001: query: test.example.com IN A +E

No final das linhas A-, A +, -E, + E, -ED, -EDC é o que eu tento entender;

    

Answer 1

Isso está documentado no Manual de Referência do Administrador do BIND e no tarball de origem.

Do página da Web do ICS ;

The query log entry first reports a client object identifier in @0x format. Next, it reports the client's IP address and port number, and the query name, class and type. Next, it reports whether the Recursion Desired flag was set (+ if set, - if not set), if the query was signed (S), EDNS was in used along with the EDNS version number (E(#)), if TCP was used (T), if DO(DNSSEC Ok) was set (D), if CD (Checking Disabled) was set (C), if a valid DNS Server COOKIE was received (V), or if a DNS COOKIE option without a valid Server COOKIE was present (K). After this the destination address the query was sent to is reported. Note: This reflects BIND 9.11.0 behaviour.