Help!!

[Allan Pincus]

I rebooted my server today, and now when I try and ping a host, I get the message "unknown host" error.

I use /etc/hosts for my lookup, and everything in the file looks fine, and has not changed in ages.

"named" is running, but I did not turn it on, so I don't know if it has been running, or if I should turn it off.

Can someone give me a clue as to what might be going on? I am NOT using resolv.conf and checked to make sure that it does not exist.

Thanks!

[Joaquin Gil de Vergara]

the /etc/nsswitch.conf file define the name resolution policy (hosts, NIS, DNS) to hosts, networks etc...

you have some examples in /etc/nsswitch.* files

the /etc/resolv.conf defines name servers to resolve names by DNS domain, but you must enable dns to use it

named is the name server daemon. If you host not is a name server you can stop it

How is your nsswitch.conf and hosts files?

[Sridhar Bhaskarla]

If you are not using resolv.conf, then you are not using named. Use "sig_named kill" to stop named. Also disable it permanently in /etc/rc.config.d/namesvrs file.

ALso look at your /etc/nsswitch.conf file and make sure files is first in the order.

Grep for the host in /etc/hosts and see if the entry is there.

Finally look for the permissions on /etc/hosts and /etc/nsswitch.conf. They should have read permissions for the world and won't work if you are running as an ordinary user.

-Sri

[MANOJ SRIVASTAVA]

try this


reanme /etc/resolv.conf to some other file and than do a nslookup and chech whter it is reoslved correclty or not.


Manoj Srivastava

[RAC_1]

stop named in /etc/rc.config.d/namesvrs.
Check /etc/nsswitch.conf file.
It should look like as follows if you are using /etc/hosts for name lookup.
#
# /etc/nsswitch.files:
#
# @(#)B.11.11_LR
#
# An example file that could be copied over to /etc/nsswitch.conf; it
# does not use any name services.
#
passwd: files
group: files
hosts: files
services: files
networks: files
protocols: files
rpc: files
publickey: files
netgroup: files
automount: files
aliases: files

also check resolv.conf in /etc dir.

[Anil C. Sedha]

Check the following

/etc/nsswitch.conf

hosts files dns

If this is fine then verify that you have the correct entry in your /etc/hosts file once again for the IP address.

Verify that your /etc/rc.config.d/namesvrs file has correct nameservers listed.

Check your /etc/netconf file for the gateway defined. You may also check this via the command

netstat -rn

If you see the correct gateway defined then problem is in DNS probably.

Verify by pinging with hostname and ipaddress.


If you are able to ping a hostname then no problems with dns. Try stopping and restarting your network services.

Let us know if you don't succeed even after doing this.

Regards,
Anil

[Magic_Wand]

try doing a lookup of your system name **AND** IP address. It should show it's using FILES and return correctly.