ubuntu networking: DNS settings ignored
For several months, I have been successfully connected to the net via a static IP with my machine that is running ubuntu. I recently had to reinstall the OS, and now on the same machine, the system is ignoring my DNS settings. The DNS server hasn't changed, nor has the machine's static IP address changed. Furthermore, I can ping the DNS IP addresses with no problem from the ubuntu device. As a double check, other machines that I own have no trouble with DNS using the same addresses.
For the purpose of this discussion, assume the following hypothetical settings:
Hostname: host-o-rama-bama.com Static IP: 10.20.30.40 Gateway: 10.20.30.1 Netmask: 255.255.255.0 DNS server: 100.110.120.130 DNS server: 100.110.120.140
Using the Ubuntu Network Manager, I configured these settings as follows:
General * Automatically connect to this network when it is available: Yes * All users may connect to this network: Yes Ethernet * Device: enp2s0f1 * Wake on LAN: Default 802.1x security (None) DCB (None) IPV4 Settings * Method: Manual * Address: 10.20.30.40 * Netmask: 255.255.255.0 * Gateway: 10.20.30.1 * DNS Servers: 100.110.120.130,100.110.120.140 * Search Domains: host-o-rama-bama.com IPV6 Settings * Method: Ignore
After starting the network ...
# ifconfig enp2s0f1 Link encap:Ethernet HWaddr 80:fa:5b:4c:02:07 inet addr:10.20.30.40 Bcast:10.20.30.255 Mask:255.255.255.0 inet6 addr: fe80::82fa:5bff:fe4c:207/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:63252 errors:0 dropped:0 overruns:0 frame:0 TX packets:40966 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:53814860 (53.8 MB) TX bytes:5441842 (5.4 MB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:7029 errors:0 dropped:0 overruns:0 frame:0 TX packets:7029 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:650606 (650.6 KB) TX bytes:650606 (650.6 KB)
At this point, I can ping each of my DNS servers via their IP addresses.
Furthermore, remote sites can ping my ubuntu host both by its static IP address and also by the name
host-o-rama-bama.com, which is already set up on the DNS servers. I can even ssh into my host both via its IP address and its DNS name.
However, I cannot see any domain names from the ubuntu machine, but , I can indeed access anywhere I want on the net via ssh, telnet, http, ping, etc. as long as I use the IP address.
/etc/resolvconf/resolv.conf.d/base, I put the following, and then I ran
resolvconf -u ...
domain host-o-rama-bama.com search host-o-rama-bama.com nameserver 100.110.120.130 nameserver 100.110.120.140
However, after running it, the DNS is still not working.
I put the following into
# interfaces(5) file used by ifup(8) and ifdown(8) auto enp2s0f1 iface enp2s0f1 inet static address 10.20.30.40 netmask 255.255.255.0 gateway 10.20.30.1 dns-nameserver 100.110.120.130 dns-nameserver 100.110.120.140 dns-search host-o-rama-bama.com
I then did the following:
# ifdown enp2s0f1 # ifup enp2s0f1
Nothing changed. The DNS is still not working.
I then tried this ...
# /etc/init.d/network-manager stop # /etc/init.d/network-manager start
The DNS is still not working.
Then, I did this:
# service networking restart
... and still no DNS.
What am I missing?
Thank you in advance.