Open System Services Shell and Utilities Reference Manual (G06.28+, H06.05+)

Administrator Commands and Files lwresd(8)

-T tcpip_process_name

Start lwresd using the transport provider named tcpip_process_name

. The pro-

cess name must be speciﬁed as an OSS pathname for a Guardian process; that is,

/G/ZTC0 is a valid speciﬁcation.

This ﬂag overrides the default behavior of starting with the process $ZTC0 as the

transport provider process.

-u user Change the user ID to user after completing privileged operations, such as creat-

ing sockets that listen on privileged ports.

-v Report the version number and exit.

DESCRIPTION

lwresd is the server providing name lookup services to clients that use the BIND 9 lightweight

resolver library. It is a stripped-down, caching-only name server that answers queries using the

BIND 9 lightweight resolver protocol rather than the DNS protocol.

lwresd listens for resolver queries on a UDP port on the IPv4 loopback interface, 127.0.0.1. This

means that lwresd can only be used by processes running on the local machine. By default, UDP

port number 921 is used for lightweight resolver requests and responses.

Incoming lightweight resolver requests are decoded by the server, which then resolves them

using the DNS protocol. When the DNS lookup completes, lwresd encodes the answers in the

lightweight resolver format and returns them to the client that made the request.

If /etc/resolv.conf contains any nameserver entries, lwresd sends recursive DNS queries to

those servers. This is similar to the use of forwarders in a caching name server. If no

nameserver entries are present, or if forwarding fails, lwresd resolves the queries autonomously

starting at the root name servers, using a built-in list of root server hints.

FILES

/etc/resolv.conf

The default conﬁguration ﬁle.

RELATED INFORMATION

Commands: named(8).

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