On 23/08/17 13:02, Andrei Borzenkov wrote:

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23 авг. 2017 г., в 8:46, Per Jessen написал(а):

Paul Groves wrote:

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I have a strange problem when pinging a few machines on various iterations of opensuse / ubuntu.

I wanted to ping a computer on my lan e.g. ping paul-pc

which returned: ping: paul-pc: Name or service not known

so I then ran: nslookup paul-pc

which returned the correct IP of paul-pc

I am also unable to ssh to the hostname but I can using the IP.

any idea why? It must be a DNS issue.

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I am confused because I can ping and ssh other devices on the same network without issue. Right, so your network is fine, the issue is in resolving names to address, i.e. DNS.

To start with, please post the contents of /etc/resolv.conf. which domain name are you using?

Here is the resov.conf file paul@suseserver:~$ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN # 127.0.0.53 is the systemd-resolved stub resolver. # run "systemd-resolve --status" to see details about the actual nameservers. nameserver 192.168.0.4 nameserver 127.0.0.53

As nslookup works, this file is probably OK. But /etc/nsswitch.conf would be interesting. here is the nsswitch file

paul@suseserver:~$ cat /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference' and `info' packages installed, try: # `info libc "Name Service Switch"' for information about this file. passwd: compat group: compat shadow: compat gshadow: files hosts: files resolve [!UNAVAIL=return] dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org

On 23/08/17 16:26, Carlos E. R. wrote:

try: host paul-pc 192.168.0.4 host paul-pc 127.0.0.53

If the answer is not correct in one of them, you may have to take it up with the DNS admin:-) Ta da! it works. It was a silly cause (as always).

Ignore 127.0.0.53 because it is the system resolve address and is supposed to be there. I was missing dns-search in my /etc/network/interfaces file (see below). auto enp0s3 iface enp0s3 inet static address 192.168.0.20 netmask 255.255.255.0 gateway 192.168.0.1 network 192.168.0.0 dns-nameservers 192.168.0.4 dns-search domainname Where domain.net is my domain name (not really but you get it). I don't know why it only affected the one server but I have added the dns-search line onto all of them and they still work fine. So now I can ping paul-pc and I get the correct IP address back. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org