Compaq Compaq TCP/IP Services for OpenVMS Manual de servicio descargar pdf (Pagina 86)

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.

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