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Top Forums UNIX for Advanced & Expert Users bind 9 forwarders: use UDP or TCP? Post 302421999 by fpmurphy on Monday 17th of May 2010 08:46:35 AM
Old 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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in.echod(1M)						  System Administration Commands					      in.echod(1M)

NAME
in.echod - UDP or TCP echo protocol service daemon SYNOPSIS
in.echod FMRI svc:/internet/echo: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.echod service provides the server-side of the echo protocol. This protocol is used for debugging and bandwidth measurement and is available on both TCP and UDP transports, through port 7. The in.echod service is an inetd(1M) smf(5) delegated service. The in.echod detects which transport is requested by examining the socket it is passed by the inetd daemon. TCP-based service Once a connection is established, the in.echod echoes any data received from the client back to the client. The server echoes data until the client program terminates the connection. UDP-based service The in.echod listens for UDP datagrams. When a datagram is received, the server creates a UDP datagram containing the data it received and sends it to the client. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNW | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
inetd(1M), attributes(5), smf(5) RFC 862 SunOS 5.10 23 Aug 2004 in.echod(1M)
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