Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: resolv.conf and DNS configration
Operating Systems AIX resolv.conf and DNS configration Post 302404139 by bakunin on Monday 15th of March 2010 04:15:43 PM
Old 03-15-2010
To be honest i do not know exactly what you are doing and what you want to achieve. Please restate your requirements if the (generic) explanation below is not covering your needs.

To enable the name resolution via DNS the system has to be told where to ask - i.e. what the IP address of the name server is. This information is stored in /etc/resolv.conf.

If you execute, for instance, a "ping remote.host.com" the following happens:
  1. your host notices that "remote.host.com" is no IP-address and attempts to resolve it.
  2. your host looks up /etc/netsvc.conf to find out which method(s) of name resolution (DNS, NIS, /etc/hosts) it should use and in which order of precedence
  3. in case of DNS your host sends a request to the DNS server identified in /etc/resolv.conf and waits until it answers or the timeout value is reached
  4. the DNS server answers with an IP-address (for a name) or a name (for an IP address)
  5. your host issues "ping IP-address" with the IP-address provided by your name resolution method.

If now the name resolution is significantly slower with DNS than it is otherwise (maybe a local /etc/hosts with the same information?) probably the answer from your name server arrives late - maybe because of network congestion, maybe because the name server is under load, maybe something else.

To investigate possible causes for such a problem you can do nothing else than carefully testing and approving/disproving the various possible reasons.

I hope this helps.

bakunin
 

10 More Discussions You Might Find Interesting

1. IP Networking

/etc/resolv.conf

I am new to unix. I have edited the /etc/resolv.conf. It shows domain name ip address ip address These are the same ips of the dns I use for windows. Still I get no name resolution on the internet. I can ping external ip's is there anything else I need to check? (1 Reply)
Discussion started by: rpnhavoc
1 Replies

2. UNIX for Dummies Questions & Answers

dns and resolv.conf

Hi ,,still struggling with unix ,,the system is running sco openserver release 5 and have dsl installed ,, the dsl modem is a bt router which in turn is connected to a vpn hardware router,, which also serves internet to the whole network ,, but i still cant connect to the internet via the unix box... (10 Replies)
Discussion started by: b03der
10 Replies

3. SuSE

Suse 10 resolv.conf

I want to have 7 search domains in my resolv.conf, but it seems to like only the first six. I read somewhere that the OS will only recognize the first 6 (or the first 154 characters). Is that the case with SUSE 10? thx -Kevin (2 Replies)
Discussion started by: kjbaumann
2 Replies

4. Solaris

resolv.conf & the internet

Hi I have DNS setup on Solaris 10 thought it isn't reoslveing Internet addresses properly If I traceroute The UNIX and Linux Forums - the Top UNIX & Linux Q&A on the Web, I get to a hop to my DSL router but no further hops - DNS Client & Multicast services are running - nsswitch.conf is... (1 Reply)
Discussion started by: stevie_velvet
1 Replies

5. Shell Programming and Scripting

resolv.conf

HI ALL I am making a script,That will does the following,I am in search of ideas 1.Script will comment all existing the entries in resolve.conf 2.Add new entries like this abc.example.com 192.168.1.x I can use sed to add comment. (8 Replies)
Discussion started by: aliahsan81
8 Replies

6. UNIX for Dummies Questions & Answers

resolv.conf

Hi everyone A quick question during a audit this was determined to be a security issue In the resolv.conf there is a “.” At the end of the domain name Like this domain mydomain.com. I which to understand the function or significance of the . thk (3 Replies)
Discussion started by: Ex-Capsa
3 Replies

7. Ubuntu

resolv.conf

Hi, My resolv.conf keeps overwritten. I want to have it to just keep the setting that I put in there. I tried a few solutions I found using google. like supersede domain-name "xxx", prepend domain-name-servers xxx.xxx.xxx.xxx; This does'nt work. I also tried to just chmod the file to... (4 Replies)
Discussion started by: jld
4 Replies

8. Red Hat

Issue on resolv.conf

Hi all, :( I am facing issue while I have updated in resolv.conf, after nework service restart, it was automatically deleted IP from resolv.conf file. Could you please let me know what is the reason resolv.conf deleted any IP which I have manually updated, but it store only my router IP... (3 Replies)
Discussion started by: Pradipta Kumar
3 Replies

9. UNIX for Dummies Questions & Answers

DNS server - /etc/resolv.conf file issue

Hi, Am trying to configure DNS server and trying to keep the information in /etc/resolv.conf file as: search server nameserver 192.168.0.10 when i restart the network service with #service network restart, resolv.conf file is changing as: nameserver 192.168.0.10 search server -... (5 Replies)
Discussion started by: raosr020
5 Replies

10. Solaris

Configure resolv.conf and nsswitch.conf

Hi, I've installed Solaris 11.3(live media) and configured DNS. Everytime I reboot the server, resolv.conf got deleted and it created a new nsswitch.conf. I used below to configure both settings: # svccfg -s dns/client svc:/network/dns/client> setprop config/nameserver = (xx.xx.xx.aa... (1 Reply)
Discussion started by: flexihopper18
1 Replies

LEARN ABOUT OPENSOLARIS

avahi-resolve

avahi-resolve(1)					      General Commands Manual						  avahi-resolve(1)

NAME

       avahi-resolve - Resolve one or more mDNS/DNS host name(s) to IP address(es) (and vice versa) using the Avahi daemon

SYNOPSIS

       avahi-resolve --name host-name ...

       avahi-resolve-host-name host-name ...

       avahi-resolve --address address ...

       avahi-resolve-address address ...

DESCRIPTION

       Resolve	one  or more mDNS/DNS host name(s) to IP address(es) (and vice versa) using the Avahi daemon. The daemon is not the standard Avahi
       daemon but a proxy to a Bonjour daemon.

OPTIONS

       When passing -n, specify one or more fully qualified mDNS/DNS host name(s) (e.g. "foo.local") to resolve into IP addresses on  the  command
       line. When passing -a, specify one or more IP address to resolve into host names.

       avahi-resolve-host-name is equivalent to avahi-resolve --name.

       avahi-resolve-address is equivalent to avahi-resolve --address.

       -n | --name
	      Translate one or more fully qualified host names into addresses.

       -a | --address
	      Translate one or more addresses into fully qualified host names.

       -v | --verbose
	      Enable verbose mode.

       -6     When resolving a host name, look for IPv6 addresses exclusively.

       -4     When resolving a host name, look for IPv4 addresses exclusively.

       -h | --help
	      Show help.

       -V | --version
	      Show version information.

SEE ALSO

       avahi-publish-address(1)

COMMENTS

       This man page was written using xml2man(1) by Oliver Kurth.

Manuals 							       User							  avahi-resolve(1)
All times are GMT -4. The time now is 06:32 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy