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-   -   Nameserver (DNS) failure, the connection May not work. (https://www.linuxquestions.org/questions/linux-networking-3/nameserver-dns-failure-the-connection-may-not-work-814034/)

saia 06-14-2010 06:30 AM

Nameserver (DNS) failure, the connection May not work.
 
sometimes my internet connection in case of error. when I look under wvdial, there is a message as follows:

Code:

-> Warning, can not find address for `www.suse.de`
-> Warning, address lookup does not work
-> Nameserver (DNS) failure, the connection May not work.

What do these messages mean?
How do I handle this?

centosboy 06-14-2010 06:44 AM

Quote:

Originally Posted by saia (Post 4002977)
sometimes my internet connection in case of error. when I look under wvdial, there is a message as follows:

Code:

-> Warning, can not find address for `www.suse.de`
-> Warning, address lookup does not work
-> Nameserver (DNS) failure, the connection May not work.

What do these messages mean?
How do I handle this?

Code:

cat /etc/resolv.conf

do you have any nameserver addresses in this file??
can you ping either of these nameservers?

saia 06-14-2010 07:39 AM

Quote:

Originally Posted by centosboy (Post 4002988)
Code:

cat /etc/resolv.conf

This contents of /etc/resolv.conf
Code:

nameserver 203.130.206.250
nameserver 202.134.0.155

and this results from the ping
Code:

PING 203.130.206.250 (203.130.206.250) 56(84) bytes of data.
64 bytes from 203.130.206.250: icmp_seq=1 ttl=60 time=398 ms
64 bytes from 203.130.206.250: icmp_seq=2 ttl=60 time=398 ms

--- 203.130.206.250 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 398.295/398.586/398.878/0.695 ms


centosboy 06-14-2010 09:28 AM

Quote:

Originally Posted by saia (Post 4003028)
This contents of /etc/resolv.conf
Code:

nameserver 203.130.206.250
nameserver 202.134.0.155

and this results from the ping
Code:

PING 203.130.206.250 (203.130.206.250) 56(84) bytes of data.
64 bytes from 203.130.206.250: icmp_seq=1 ttl=60 time=398 ms
64 bytes from 203.130.206.250: icmp_seq=2 ttl=60 time=398 ms

--- 203.130.206.250 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 398.295/398.586/398.878/0.695 ms



are these the same address after you have connected with wvdial?

saia 06-15-2010 03:23 AM

That is the DNS address provided by the internet provider that I use.

And in the configuration file / etc / wvdial.conf

Code:

Auto DNS = 1

centosboy 06-15-2010 03:55 AM

Quote:

Originally Posted by saia (Post 4003934)
That is the DNS address provided by the internet provider that I use.

And in the configuration file / etc / wvdial.conf

Code:

Auto DNS = 1

those ping times are quite heavy.

can you dig www.suse.de and post the results here.
i want to check on the Query time.

Code:

dig www.suse.de

salasi 06-15-2010 07:24 AM

Quote:

Originally Posted by centosboy (Post 4003954)
those ping times are quite heavy.

(assuming heavy = long = slow) Yeah, they will be, he's on dial-up.

If nothing else goes wrong apart from this error message, you can probably ignore it. There is a check on start-up of your connection that domain name services look-up works correctly (and your system is failing that test). If nothing else goes wrong, like failure to find websites that you know are really there, it probably only means that this test is being carried out before the link is really up-and-running or the timeout is set slightly too short for the speed of your connection and the speed of those nameservers.

If you are occasionally getting web pages not found and/or your performance is poor, ping your nameservers and check that the ping response times don't occasionally go through the roof (some of the lower cost isps don't really have adequate nameservers, particularly for their older, lower cost, services) and there may be a case for changing to other nameservice providers.

saia 07-06-2010 11:11 AM

well,I can not get online so I can not log in to provide additional information.

I re-install packages in the hope of getting the network configuration is still the default or standar or raw (which one of those words in english is use, I'm sorry I'm not fluent in English).


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