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ping by hostname not working

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# 1  
Old 11-24-2011
ping by hostname not working

anyone ever seen this problem:

I can ping the server by IP address but I can't by hostname.

nslookup is working and dns query is ok.

[root@puppetmaster network-scripts]# nslookup mwxnsb24
Name:   mwxnsb24
[root@puppetmaster network-scripts]# ping
PING ( 56(84) bytes of data.
64 bytes from  icmp_seq=1 ttl=57 time=3.52 ms
64 bytes from icmp_seq=2 ttl=57  time=2.88 ms
--- ping statistics ---
2 packets transmitted, 2 received, 0% packet  loss, time 999ms
rtt min/avg/max/mdev = 2.886/3.204/3.522/0.318  ms

[root@puppetmaster ~]# ping mwxnsb24
ping:  unknown host mwxnsb24

Last edited by Scott; 11-24-2011 at 03:14 AM.. Reason: Removed formatting, change quote to code tags
# 2  
Old 11-24-2011

may you please post the contents of /etc/nsswitch.conf, /etc/resolv.conf and /etc/hosts?

see ya


Last edited by frappa; 11-24-2011 at 03:39 AM.. Reason: typo correction
# 3  
Old 11-24-2011
here you go:


#hosts: db files nisplus nis dns
hosts: files dns
bootparams: nisplus [NOTFOUND=return] files

ethers: files
netmasks: files
networks: files
protocols: files
rpc: files
services: files

netgroup: nisplus
publickey: nisplus
automount: files nisplus
aliases: files nisplus

[root@puppetmaster ~]# cat /etc/resolv.conf
; generated by /sbin/dhclient-script

[root@puppetmaster ~]# cat /etc/hosts
# HEADER: This file was autogenerated at Wed Oct 05 18:38:36 -0400 2011
# HEADER: by puppet. While it can still be managed manually, it
# HEADER: is definitely not recommended.
# Do not remove the following line, or various programs
# that require network functionality will fail. localhost.localdomain localhost
# puppetmaster.nyfix.selab.local puppetmaster puppetmaster.nyfix.selab.local puppetmaster puppetclient.nyfix.selab.local puppetclient
if I place the hostname in /etc/hosts its pingable.
# 4  
Old 11-24-2011

config files seem ok.
Googling around it seems somebody also experienced similar issues; not clear if and how they cleared the problem though..

First thing you could try to exclude problems with the internal nameservers you are using.
If you can, try reproduce the problem by ping/nslookup to an external site (i.e.: www.
If the above can be done, try also to use some external dns server (i.e. opendns) and repeat the test against an external host (i.e. www. again).

If you can execute the above tests and if the results of the above tests replay the problem already posted, we can exclude a problem with internal dns servers.

Next thing I could suggest is verifying the shared libraries used by nslookup and by ping:
this can be done by:
- looking for the full paths to nslookup and ping:
which nslookup
which ping

- then listing the shared libraries to check for problems:
ldd -v /path/to/nslookup
ldd -v /path/to/ping

and verifying that the required libraries are actually available (in particular, the libdns* and libresolv* ones).

I may also suggest the following forum:
Weird ping issue on redhat box - Page 2 - [H]ard|Forum
the user ScYcS experienced similar problem, you could contact her/him directly to kow if and how he cleared the issue.

see ya

Last edited by frappa; 11-24-2011 at 04:59 AM.. Reason: removed urls to, only string values needed
This User Gave Thanks to frappa For This Post:
# 5  
Old 11-25-2011
here's what i have done so far:
- Reverse the order "files dns" in /etc/nsswitch.conf and /etc/host.conf to have proper search as well
- Verified shared libraries of ping and nslookup using ldd -v /path/to/ping and verified that the required libraries are actually available (in particular, the libdns* and libresolv* )
- Tried to switch off network_ipv6 in /etc/sysconfig/network
- Interchange IP address of eth0 and eth1
- Even turn off the iptables firewall service to make sure there is no something blocking from the firewall
- I can dig the clients and get the proper replies
- I can nslookup and get the proper replies
Still, haven't figured it out yet

Btw, my OS is Redhat 5.4 and it is a vm machine.

Last edited by linuxgeek; 11-25-2011 at 05:01 AM..
# 6  
Old 11-25-2011

just for sake of completeness: did you experience this issue after an update/installazion of obsolete/new software, just after installation or all of a sudden?

see ya
# 7  
Old 11-25-2011
there is no new updates/installation of software or packages. The server is in lab environment and what is newly configured is NAT to connect it in production network. now, it is connected to prod by pinging the IP address of servers but can't ping by hostname. already exported the dns servers from prod network to the server but still encountered the same.
[root@puppetmaster ~]# nslookup mwxnsb24


[root@puppetmaster ~]# ping mwxnsb24

[root@puppetmaster ~]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Last edited by pludi; 11-25-2011 at 01:16 PM..

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