05-17-2010
As far as I know you need to have port 53 open for both UDP and TCP.
Most normal DNS traffic uses UDP not TCP. However AXFR uses TCP
to replicate zone data.
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LEARN ABOUT SUNOS
in.discardd
in.discardd(1M) System Administration Commands in.discardd(1M)
NAME
in.discardd - UDP or TCP discard protocol service
SYNOPSIS
in.discardd
FMRI
svc:/internet/discard:default
DESCRIPTION
FMRI stands for Fault Management Resource Identifier. It is used to identify resources managed by the Fault Manager. See fmd(1M) and
smf(5).
The in.discardd service provides the server-side of the discard protocol. This protocol is used for debugging and bandwidth measurement and
is available on both TCP and UDP transports through port 9.
The in.discardd service is an inetd(1M) smf(5) delegated service. The in.discardd detects which transport is requested by examining the
socket it is passed by the inetd daemon.
The discard service simply throws away any data it receives from the client.
TCP-based service
Once a connection is established, the in.discardd discards any data received. No response is generated. The connection remains open
until the client terminates it.
UDP-based service
The in.discardd listens for UDP datagrams. When a datagram is received, the server discards it. No response is sent.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcnsu |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
SEE ALSO
inetd(1M), attributes(5), smf(5)
RFC 863
SunOS 5.10 23 Aug 2004 in.discardd(1M)