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Full Discussion: overriding /etc/resolv.conf with .nslookuprc file
Special Forums IP Networking overriding /etc/resolv.conf with .nslookuprc file Post 302101271 by Perderabo on Saturday 30th of December 2006 10:39:59 AM
Old 12-30-2006
Quote:
Originally Posted by smanu
I have come across a fact that /etc/resolv.conf can be overrided by using ~/.nslookuprc.
Is this completely true...i.e can I completely override /etc/resolv.conf.
No, it is almost totally false.

When you give a command like "telnet this.that.com", the telnet command must convert this.that.com to an ip address. To do that, the telnet program will call some subroutines that are called the resolver. The resolver will read /etc/resolv.conf (assuming that the box is configured to use DNS). But the resolver does not know about .nslookuprc and will ignore it completely.

Meanwhile, there is a program called nslookup which is sometimes used to debug DNS issues. nslookup is the first widespread DNS tool. It (unfairly I think) has a reputation as a poor tool. Many people have moved on to "dig" which is a more powerful DNS tool. But some folks still use nslookup. nslookup does not use the resolver. But it sometimes peeks at /etc/resolv.conf directly. nslookup is the only program that knows about .nslookuprc. If you put enough stuff in .nslookuprc, nslookup will not need to peek at /etc/resolv.conf. In this sense alone can .nslookuprc override /etc/resolv.conf.
 

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LEARN ABOUT DEBIAN

nisd_resolv

rpc.nisd_resolv(1M)					  System Administration Commands				       rpc.nisd_resolv(1M)

NAME

       rpc.nisd_resolv, nisd_resolv - NIS+ service daemon

SYNOPSIS

       rpc.nisd_resolv [-v | -V]  [ -F [-C fd]] [-t xx] [-p yy]

DESCRIPTION

       rpc.nisd_resolv	is  an auxiliary process which provides DNS forwarding service for NIS hosts requests to both ypserv and rpc.nisd that are
       running in the NIS compatibility mode. It is generally started by invoking  rpc.nisd(1M) with the -B  option  or  ypserv(1M)  with  the	-d
       option. Although it is not recommended, rpc.nisd_resolv can also be started independently with the following options.

       This  command requires that the /etc/resolv.conf file be setup for communication with a DNS nameserver. The nslookup utility can be used to
       verify communication with a DNS nameserver.  See resolv.conf(4) and nslookup(1M).

OPTIONS

       -F	Run in foreground.

       -C fd	Use  fd for service xprt (from nisd).

       -v	Verbose. Send output to the syslog daemon.

       -V	Verbose. Send output to stdout.

       -t xx	Use transport  xx.

       -p yy	Use transient program#	yy.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWnisu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       nslookup(1M), rpc.nisd(1M), resolv.conf(4), attributes(5)

NOTES

       NIS+ might not be supported in future releases of the SolarisTM Operating Environment. Tools to aid the migration from  NIS+  to  LDAP  are
       available in the Solaris 9 operating environment. For more information, visit http://www.sun.com/directory/nisplus/transition.html.

SunOS 5.10							    12 Dec 2001 					       rpc.nisd_resolv(1M)
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