DNS BIND Server Clause

  server ip-addr {
  [ bogus yes | no ; ]
	[ edns yes | no ; ]
  [ keys "key-name"; ["key-name"; ... ; ]
  [ provide-ixfr yes | no; ]
  [ request-ixfr yes | no; ]
  [ transfers number; ]
  [ transfer-format ( one-answer | many-answers ); ]
  ;}

 bogus yes | no 

Indicates that traffic from this server should be ignored e.g. if known to be giving bad data, generating a DoS attack or some other reason. This statement can be used in the server clause only.

 edns yes | no ;

Defines whether to use EDNS (RFC 2671) with a specific server (yes) or not (no). The default is yes. This statement may only be used in a server clause.

 keys "key-name"; ["key-name"; ... ;];
 keys "key-name"; ["server1-key-name";

The key-name field references a key clause with the same key-name and mandates that TSIG transactions (zone transfer or DDNS operation) with use this key. While syntax allows for multiple keys current versions of BIND (9.x) only support a single key-name per server. This statement may only be used in a server clause.

 [ transfers number ; ]

Limits the number of concurrent zone transfers from any given server. If not present the default for transfers-per-ns is used. This option may be specified only in a server clause.