Home / server / Questions / 810747
In Process
Kirby
Asked: 2016-10-24 02:34:18 +0800 CST

How to determine whether nameservers are working or not?

  • 772

During waking up Vagrant VM I have some troubles with the network in one work space, and it works fine in another one.

I'm trying to determine automatically DNS troubles (and fix it adding nameservers manually and disable PEERDNS), but the result is not stable:

0 ✓ vagrant 10:13:15 ~
$ ping -c 1 dl.fedoraproject.org
ping: unknown host dl.fedoraproject.org

2 ✗ vagrant 10:13:39 ~
$ time ping -c 1 dl.fedoraproject.org
PING dl.fedoraproject.org (209.132.181.25) 56(84) bytes of data.
64 bytes from 209.132.181.25: icmp_seq=1 ttl=38 time=179 ms

--- dl.fedoraproject.org ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 179.362/179.362/179.362/0.000 ms

real    0m12.067s
user    0m0.001s
sys     0m0.001s

0 ✓ vagrant 10:16:57 ~
$

In the end the exit code, of course, is "0". :(

Is there any right way to determine a problem?

ping nameserver vagrant

1 Answers

  1. The standard answer for this kind of questions should be STFW.
    Since I'm so kind, I'll tell you that you should use nslookup or dig instead of ping for DNS troubleshooting.

    • 2