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Why does DNS resolution fail?
Check if a DNS server is assigned to the network interface. If it doesn’t resolve, contact your ISP. Run nslookup from the command prompt (Windows) or the Terminal (macOS) for a public host, such as www.sophos.com, and verify that it resolves to an IP address. If it doesn’t resolve, contact your ISP.
Why can’t I ping my DNS server?
Causes: This issue is typically caused by a problem with domain name server (DNS) resolution because the Internet service provider’s DNS servers are unavailable or a problem with the security software (usually a firewall) running on the computer which is attempting to access the Internet.
Should I ping my DNS?
When DNS problems occur, one of the first things you should do is verify that the DNS server still has network connectivity. You should also try to ping the DNS server from a few random machines. Remember that ping will work only if you allow ICMP packets through the firewall on the machine you are pinging.
Does nslookup use ping?
1 Answer. nslookup consults only the DNS server configured, while ping -a uses additional methods like NETBIOS to resolve the name. If both computers are in the same network segment, they use broadcast messages to exchange host names without a DNS server, so ping -a works and nslookup doesnot.
How do you check if DNS is not working?
Run ipconfig /all at a command prompt, and verify the IP address, subnet mask, and default gateway. Check whether the DNS server is authoritative for the name that is being looked up. If so, see Checking for problems with authoritative data.
Should I be able to ping a DNS server?
Why is dig / nslookup cannot resolve but ping can?
dig and nslookup are going to ignore the hosts file, they want to resolve via asking the primary DNS server. Ping and your browser on the other hand will use the hosts file, and so it looks like that’s the reason dig and nslookup can’t resolve.
Is the DNS server working for WGET / curl / dig?
I am sure DNS server is okay. when issuing commands like wget/curl/dig, there’s DNS request for URL, but DNS always failed to response. ping and nslookup works fine. If i bind static IP with URL, it works fine.
What happens if curl and Ping don’t work?
The host itself doesn’t have to run or even exist at all. curl/ping try to resolve an IP-address with mDNSResponder or by other means and finally operate on/interact with the remote host. If the host 192.168.11.11 doesn’t run or doesn’t exist at all, both will fail.
What happens if the DNS is not correct?
If the host 192.168.11.11 doesn’t run or doesn’t exist at all, both will fail. Now, either the DNS entry is wrong (api.local.pcfdev.io has another IP than 192.168.11.11) or the DNS entry is correct but the host 192.168.11.11 is not running.