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Full Discussion: DNS is hang in AIX 6.1
Operating Systems AIX DNS is hang in AIX 6.1 Post 302431240 by bakunin on Monday 21st of June 2010 08:14:27 AM
Old 06-21-2010
In "/etc/netsvc.conf" you specify the precedence in which the various possible sources for name resolution are being used. The entries after "hosts=" are used in the order they appear in this list. What you see as "hang" is probably the source queried first not knowing about the host. This source will have to time out before the next source in the list is queried.

That means: suppose you want to resolve the name of some host "host.at.your.domain" and the content of your "/etc/netsvc.conf" is

Code:
hosts=local,bind

which would mean the system looks in its "/etc/hosts" file (=local) first and only if this fails will query the DNS server (bind). If "/etc/hosts" doesn't hold an entry about "host.at.your.domain" it will look up this, wait for the timeout, only then ask the name server.

Have a look at your "/etc/netsvc.conf" file and determine which source of information has precedence. Then investigate if this source is able to answer the query for a certain IP address.

I hope this helps.

bakunin
 

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netid(4)							   File Formats 							  netid(4)

NAME
netid - netname database SYNOPSIS
/etc/netid DESCRIPTION
The netid file is a local source of information on mappings between netnames (see secure_rpc(3NSL)) and user ids or hostnames in the local domain. The netid file can be used in conjunction with, or instead of, the network source: NIS or NIS+. The publickey entry in the nss- witch.conf (see nsswitch.conf(4)) file determines which of these sources will be queried by the system to translate netnames to local user ids or hostnames. Each entry in the netid file is a single line of the form: netname uid:gid, gid, gid... or netname 0:hostname The first entry associates a local user id with a netname. The second entry associates a hostname with a netname. The netid file field descriptions are as follows: netname The operating system independent network name for the user or host. netname has one of two formats. The format used to specify a host is of the form: unix.hostname@domain where hostname is the name of the host and domain is the network domain name. The format used to specify a user id is of the form: unix.uid@domain where uid is the numerical id of the user and domain is the network domain name. uid The numerical id of the user (see passwd(4)). When specifying a host name, uid is always zero. group The numerical id of the group the user belongs to (see group(4)). Several groups, separated by commas, may be listed for a single uid. hostname The local hostname (see hosts(4)). Blank lines are ignored. Any part of a line to the right of a `#' symbol is treated as a comment. EXAMPLES
Example 1: A sample netid file. Here is a sample netid file: unix.789@West.Sun.COM 789:30,65 unix.123@Bldg_xy.Sun.COM 123:20,1521 unix.candlestick@campus1.bayarea.EDU 0:candlestick FILES
/etc/group groups file /etc/hosts hosts database /etc/netid netname database /etc/passwd password file /etc/publickey public key database SEE ALSO
netname2user(3NSL), secure_rpc(3NSL), group(4), hosts(4), nsswitch.conf(4), passwd(4), publickey(4) SunOS 5.10 23 May 1994 netid(4)
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