Installing and Administering Internet Services

98 Chapter3

Conﬁguring and Administering the BIND Name Service

Conﬁguring a Primary Master Name Server

Table 3-4 Boolean Options

Option Description

auth-nxdomain yes_or_no; If speciﬁed as yes, then the AA bit is always set on

NXDOMAIN responses, even if the server is not actually

authoritative. The default is yes.

deallocate-on-exit yes_or_no; If this is speciﬁed as yes, then when the server exits, it

will deallocate every object it allocated, and then writes a

memory usage report to the ﬁle speciﬁed by

memstatistics-file. The default is no because it

is faster to let the operating system clean up. However,

deallocate-on-exit can be useful for detecting

memory leaks.

fake-iquery yes_or_no; If this is yes, the server will simulate the obsolete DNS

query type IQUERY. The default is no.

fetch-glue yes_or_no; The default is yes. The sever will fetch glue resource

records it doesn’t have when constructing the additional

data section of a response. fetch-glue can be used in

conjunction with recursion no to prevent the

server’s cache from growing or becoming corrupted.

host-statistics yes_or_no; If this is set to yes, then statistics are kept for every host

that the nameserver interacts with. The default is no.

Note that turning on host-statistics can consume lots of

memory.

multiple-cnames yes_or_no; If this is set to yes, then multiple CNAME resource

records will be allowed for a domain name. The default

is no. Allowing multiple CNAME records is against the

standard and is NOT recommended. Multiple CNAME

support is available because previous versions of BIND

allowed multiple CNAME records, and those records

were used for load balancing.