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DNS problem : ping doesn't recognize hostname


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# 8  
I entered acer ( ip and hostname ) in host file of rhel.

As I mentioned, acer maintains list of host name entry in the host file.
acer is a vmware windows host whereas rhel is installed as a vitual machine in vmware
# 9  
Quote:
Originally Posted by hiten.r.chauhan
I entered acer ( ip and hostname ) in host file of rhel.
So - why don't you enter ubuntu15 plus IP into the host file?

Quote:
As I mentioned, acer maintains list of host name entry in the host file.
acer is a vmware windows host whereas rhel is installed as a vitual machine in vmware
All of this does NOT mean acer is a name server. Try to find the REAL name server(s), be it in the files on acer, be it on e.g. your router.
# 10  
Ping Failure on DNS lookup

Remember that ping often uses gethostbyname system/kernel call where traceroute often uses the actual DNS lookup. You can also easily test whether the entries are indeed in DNS by using nslookup or dig
# 11  
Quote:
Originally Posted by hiten.r.chauhan
I have vmware on my windows PC ( hostname : acer ).
vmware has RHEL 7 ( hostname : rhel7 ) installed recently.

RHEL IP configuration
IP : 192.168.5.128
Netmask : 255.255.255.0

ssh to rhel7 works from acer using putty

resolve.conf
Code:
cat /etc/resolv.conf
nameserver 192.168.5.1

host file of acer has the entry
192.168.5.1 acer

ping to acer from rhel 7 does not work.
Code:
[root@rhel7 ~]# ping acer
ping: unknown host acer

Hello

I believe that 192.168.5.1 is your Acer windows PC, and there is no DNS server on it, which are you relies to.
You'll need to set some other DNS server for your Linux server in resolf.conf, for example 8.8.8.8 (Google DNS server).

If you need to be able ping your Acer PC by name from Linux server, you can add this line at /etc/hosts:

Code:
192.168.5.1 acer

I think that you might need to improve your knowledge about DNS a little, this article can help a bit.

Last edited by imort; 04-06-2016 at 02:23 PM.. Reason: Forgot to add a link to article about DNS records
# 12  
Refresh your setting to resolve DNS issue in your computer. Go to network adapter setting and do disable and again enable. For more see my logic at
# 13  
Quote:
Originally Posted by evanbooyens
Remember that ping often uses gethostbyname system/kernel call where traceroute often uses the actual DNS lookup. You can also easily test whether the entries are indeed in DNS by using nslookup or dig
Yes, ping (and traceroute) use gethostbyname() for resolving hostnames. And gethostbyname() goes to /etc/nsswitch.conf that must have the line
Code:
hosts: files dns

to consider first /etc/hosts then DNS.
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