Technical data

Configuring and Managing BIND
5.3 Configuring the BIND Server (BIND 8.1)
5.3.2.7 Query Address
If the server does not know the answer to a question, it queries other name
servers. The query-source option specifies the source address and source port
used for such queries. If the address is an asterisk (*) or is omitted, the server
uses a wildcard IP address (INADDR_ANY). If the port is an asterisk (*) or is
omitted, the server uses a random unprivileged port. The default query-source
statement is as follows:
query-source address * port *;
The query-source option currently applies only to UDP queries; TCP queries
always use a wildcard IP address and a random unprivileged port.
5.3.2.8 Zone Transfers
Table 5–8 describes the zone transfer options.
Table 5–8 Zone Transfer Options
Option Description
max-transfer-time-in
Inbound zone transfers (BIND_SERVER_XFER processes)
running longer than this many minutes are terminated.
The default is 120 minutes (2 hours).
transfer-format The server supports two zone transfer methods. The
one-answer method uses one DNS message per resource
record transferred. The
many-answers method packs
as many resource records as possible into a message.
The
many-answers method is more efficient, but it is
understood only by BIND 8.1 and patched versions of
BIND 4.9.5. The default is
one-answer . The transfer-
format
option can be overridden on a per-server basis by
using the server statement.
transfers-in The maximum number of inbound zone transfers that
can be running concurrently. The default value is 10.
Increasing
transfers-in can speed the convergence of
slave zones, but can also increase the load on the local
system.
transfers-per-ns The maximum number of inbound zone transfers
(BIND_SERVER_XFER processes) that can be
concurrently transferring from a given remote name
server. The default value is 2. Increasing
transfers-
per-ns
can speed the convergence of slave zones, but it
can also increase the load on the remote name server.
transfers-per-ns can be overridden on a per-server
basis by using the transfers phrase of the
server
statement.
5–16 Configuring and Managing BIND