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Operating Systems
Solaris
Specifying network configuration info
Post 302069702 by FredSmith on Tuesday 28th of March 2006 02:57:56 PM
03-28-2006
Thank you, in case anyone searches the forum for a "fix" to a similar problem, the issue was:
My server's /etc/nsswitch.conf file did not specify hosts: dns
(as discussed in:
Solaris 8 System Administrator Collection >> Solaris Naming Administration Guide >> Part VI Administering DNS >> 28. Introduction to DNS >> DNS Basics
(From the document
DNS Clients and the Resolver
To be a DNS client, a machine must run the resolver. The resolver is neither a daemon nor a single program; rather, it is a set of dynamic library routines used by applications that need to know machine names. The resolver's function is to resolve users' queries. To do that, it queries a name server, which then returns either the requested information or a referral to another server. Once the resolver is configured, a machine can request DNS service from a name server.
When a machine's /etc/nsswitch.conf file specifies hosts: dns (or any other variant that includes dns in the hosts line), the resolver libraries are automatically used. If the nsswitch.conf file specifies some other name service before dns, that name service is consulted first for host information and only if that name service does not find the host in question are the resolver libraries used.
For example, if the hosts line in the nsswitch.conf file specifies hosts: nisplus dns, the NIS+ name service will first be searched for host information. If the information is not found in NIS+, then the DNS resolver is used. Since name services such as NIS+ and NIS only contain information about hosts in their own network, the effect of a hosts:nisplus dns line in a switch file is to specify the use of NIS+ for local host information and DNS for information on remote hosts out on the Internet.
There are two kinds of DNS clients:
*
Client-only. A client-only DNS client does not run in.named; instead, it consults the resolver. The resolver knows about a list of name servers for the domain, to which queries are then directed.
*
Client-server. A client-server uses the services provided by in.named to resolve queries forwarded to it by client-machine resolvers.
The Solaris operating environment includes the dynamic library routines that make up the resolver. Solaris Naming Setup and Configuration Guide, contains instructions for setting up a host as a DNS client.
My server's /etc/nsswitch.conf file did not specify hosts: dns
(as discussed in:
Solaris 8 System Administrator Collection >> Solaris Naming Administration Guide >> Part VI Administering DNS >> 28. Introduction to DNS >> DNS Basics
(From the document
DNS Clients and the Resolver
To be a DNS client, a machine must run the resolver. The resolver is neither a daemon nor a single program; rather, it is a set of dynamic library routines used by applications that need to know machine names. The resolver's function is to resolve users' queries. To do that, it queries a name server, which then returns either the requested information or a referral to another server. Once the resolver is configured, a machine can request DNS service from a name server.
When a machine's /etc/nsswitch.conf file specifies hosts: dns (or any other variant that includes dns in the hosts line), the resolver libraries are automatically used. If the nsswitch.conf file specifies some other name service before dns, that name service is consulted first for host information and only if that name service does not find the host in question are the resolver libraries used.
For example, if the hosts line in the nsswitch.conf file specifies hosts: nisplus dns, the NIS+ name service will first be searched for host information. If the information is not found in NIS+, then the DNS resolver is used. Since name services such as NIS+ and NIS only contain information about hosts in their own network, the effect of a hosts:nisplus dns line in a switch file is to specify the use of NIS+ for local host information and DNS for information on remote hosts out on the Internet.
There are two kinds of DNS clients:
*
Client-only. A client-only DNS client does not run in.named; instead, it consults the resolver. The resolver knows about a list of name servers for the domain, to which queries are then directed.
*
Client-server. A client-server uses the services provided by in.named to resolve queries forwarded to it by client-machine resolvers.
The Solaris operating environment includes the dynamic library routines that make up the resolver. Solaris Naming Setup and Configuration Guide, contains instructions for setting up a host as a DNS client.
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LEARN ABOUT ULTRIX
resolv.conf
resolv.conf(5) File Formats Manual resolv.conf(5) Name resolv.conf - resolver configuration file Description The resolver configuration file, contains information that the resolver routines read the first time they are invoked by a process. The resolver file contains ASCII text and lists the name-value pairs that provide various types of resolver information. The file is required if your system is running BIND. This file must contain the BIND domain name for the local area network. If your sys- tem is a BIND client, this file must also contain nameserver entries. There are two entry formats for the file: domain binddomain This line specifies the default domain to append to local host names. If no domain entries are present, the domain returned by after the first dot (.) is used. If the host name does not contain a domain, the root domain is assumed. nameserver address In this entry, the address is the IP address, in dot notation, of the BIND server that should be queried to resolve host name and address information. You should have at least one name server listed. Two or more name servers reduces the possibility of inter- rupted BIND service in the event that one of the servers is down. You can list up to (10) name servers. If more than one server is listed, the resolver library queries you to try them in the order listed. If no name server entries are present, the default is to use the name server on the local machine. The algorithm used is to try a name server, and, if the query times out, to try the next, until out of name servers or the query is resolved. The last step is to repeat trying all the name servers until a maximum number of retries has been made or the query has been resolved. The name value pair must appear on a single line, and the keyword or must start each line. Examples The following is an example of a file: ; ; Data file for a client ; domain cities.us nameserver 128.11.22.33 Lines beginning with a semicolon (;) are comment lines. Files See Also gethostname(2), resolver(3), named(8) Guide to the BIND Service resolv.conf(5)