How do I exclude DNS from the DHCP lease request on a Raspberry Pi?
I tried updating /etc/resolv.conf but it's reset after a while.
Reason: I am on a home network, and the home router uses itself as the DNS server, but the router's DNS service isn't working properly sometimes.
Most of the answers didn't work for me, but I found that this worked:
sudo vi /etc/dhcpcd.conf
Added a line (note that there is no comma):
static domain_name_servers=8.8.8.8 8.8.4.4
And unplugged and replugged my ethernet cable, which updates the resolver...
cat /etc/resolv.conf
Now shows:
# Generated by resolvconf
domain example.com
nameserver 8.8.8.8
nameserver 8.8.4.4
This also a better way to fix the problem where changes to /etc/resolv.conf are lost on reboot.
I asume the problem is, that the dhcpclient is getting new information about DNS servers with every dhcp-renewal. Add this line into /etc/dhcp/dhclient.conf:
option domain-name-servers 192.168.1.8, 8.8.8.8, 8.8.4.4
Of course you should replace the ip-addresses with the ones from your demanded DNS server. Probably restart the according service.
Related
I was unable to ping internal hosts.
I created an /etc/resolv.conf file in the form
nameserver internal
nameserver internal
search internal.mycomp.com mycomp.com
This worked perfectly for resolving internal host names.
However, ping www.google.com or ping www.ubuntu.com would now fail.
So, sudo apt-get would also fail.
I added opendns to resolv.conf
nameserver opendns
nameserver internal
nameserver internal
search internal.mycomp.com mycomp.com
Now ping www.ubuntu.com works, but internal resolution fails.
It would be nice to have both internal and external DNS working simultaneously.
Running opensuse tumbleweed with 4.7.5-1-default kernel and gnome.
Network managed with gnome's network-manager. Network (wired and wireless) connect to my router.
ping works also to external IPs
dig works if I provide the dns ip (eg. 8.8.8.8)
nmcli dev show | grep DNS shows the right nameservers (which I set in
the network managers interface): 8.8.8.8 and 8.8.4.4,
but dig without specification of the dns IP does not work
ping etc. to internet names (e.g. google.com) does not work.
Am completely lost by now. Help greatly appreciated.
(Matt stated the solution in his comment but I failed to understand it.)
Solution found on opensuse forum: the /etc/resolve.conf file was corrupted (empty). After deleting it and rebooting, the system (network-manager?) generated a new, working version. It contains the ip of the nameserver.
I tried to connect to my wifi network but i am not able to connect through my laptop .My other device at home are able to connect to internet. I am using ubuntu 16.04 LTS . I set my browser proxy to no proxy . I have no antivirus installed .
I tried to ping -c 5 (google .com and facebook.com) in terminal its showing unknown host google.com and unknown host facebook.com and tried to install eclipse while downloading it shows error java error unknown host .
Please help me to solve this issue.
Sounds like DNS may not have been configured when you connected to the network. This should normally happen automatically, but you can check by looking at the file /etc/resolv.conf. There should be at least one line in the file containing nameserver and an IP address.
If there are no nameserver lines, or if there's only one and it says nameserver 127.0.0.1, then you can try to use Google's public DNS by adding the line nameserver 8.8.8.8 (replacing the 127.0.0.1 if that's present).
Like everyone, I had to face this issue. So what did I do to address this issue?
1) I configured my Ubuntu server to have two network interfaces (NAT and Intnet).
2) In /etc/network/interfaces , I added the following lines:
auto enp0s8
iface enp0s8 inet static
address 192.168.10.23
dns-nameservers 8.8.8.8 8.8.4.4
3) Restarted the network - /etc/init.d/networking restart
Result: ping google.com worked.
I hope this helps you in resolving this issue :)
In order to get internet through USB from my ubuntu host, I changed routing on beaglebone
route add default gw 192.168.7.1
and change /etc/resolv.conf into
nameserver 192.168.1.1
It gets internet but I cannot ssh beaglebone like before anymore from any host.
Normally I did ssh root#192.168.7.2
but it doesn't return any message or prompt to enter password.Just blank waits there.
I there any way to fix it?
Are you sure that you shouldn't configure /etc/resolv.conf with
nameserver 192.168.7.1
It my happen that the ssh daemon is trying to resolve the reverse of the ip address you're connecting from, and it takes long to timeout, giving you the impression that it does not work.
I have a centOS system(embedded and has very binaries) with the following /etc/hosts.
$cat /etc/hosts
127.0.0.1 localhost localhost
Also the host is assigned a DNS server which returns some invalid IP for the domain name lookup of localhost. But I cannot avoid a connection to this DNS due to some network restrictions.
My question is, when I already have a valid /etc/hosts file why is the system querying the DNS for localhost? And how can I stop that?
Any help would be greatly appreciated.
Check that you have files listed before dns for the hosts entry in /etc/nsswitch.conf.
[me#home]$ grep "^hosts" /etc/nsswitch.conf
hosts: files dns
If dns comes first, then your system will always query DNS to resolve hostnames before falling back to /etc/hosts.