DNS Not Working

The cause of my most recent confusion seems to be DNS configs not working correctly so my vbox test server cannot reach outside internet via the bridged network adapter.

Under System >> server config >> nameservers I have:

8.8.8.8,8.8.4.4,100.100.2.136,100.100.2.138

However, when I check #cat /etc/resolv.conf, I get:

Code:

# cat /etc/resolv.conf
# Generated by resolvconf
search hitronhub.home example.com
nameserver 192.168.0.1
nameserver 61.31.233.1
nameserver 61.31.1.1

How can I solve this problem... outside internet is useful

 

ok... my /etc/resolv.conf now contains:

Code:

# cat /etc/resolv.conf
# Generated by resolvconf
search hitronhub.home example.com
nameserver 192.168.0.1
nameserver 61.31.233.1
nameserver 61.31.1.1
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 100.100.2.136

(the same is in the ispc gui)

No internet.. do I need to restart resolvconf somehow? I tried:

#systemctl restart resolvconf

Didn't work..

 

If your host can not reach Internet, it is not a problem with DNS. Can you ping those name server hosts, for example?
Exactly what did not work? How do you determine it is not working?

 

The host (ubuntu) has internet.... I can ping the guest ip from the host... I can ssh into the guest... the guest cannot reach outside internet..
On the host, I can successfully ping 8.8.8.8

My WP debug log was the first clue, couldn't reach wordpress, then tried #apt update can't connect to anything... Then I checked the manual...

 

So the quest can not ping 8.8.8.8?

 

Correct the guest (debian 10.5 test server) cannot ping 8.8.8.8

 

Code:

# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
From 192.168.1.84 icmp_seq=1 Destination Host Unreachable
From 192.168.1.84 icmp_seq=2 Destination Host Unreachable
From 192.168.1.84 icmp_seq=3 Destination Host Unreachable
From 192.168.1.84 icmp_seq=4 Destination Host Unreachable

 

So it is not a DNS problem.
Do other quests work? In what way is this quest different?

 

Confused.. The guest cannot ping 8.8.8.8 (or any other domain)

I also have an ubuntu guest vm that I use for update tests... it can ping 8.8.8.8

 

fair enough... you guys are the experts.. I just noticed the that /etc/resolv.conf info was different from system >> server config >> namerserver and in the manual it says the information should be the same. hence my confusion.

Any advice on how I can restore internet access to the guest machine?

the current guest is a ddrescue restore of a corrupted vdi. After successful restore, I performed these steps that enabled my network interfaces to work.

additional info:
#ifconfig -a
(located new interface name)
"eth8"

#nano /etc/network/interfaces
(replaced "eth-old" with "eth8")

#ifconfig "eth8" down && ifconfig "eth8" up

#reboot

Am I missing something?

 

So this guest runs as virtual machine on some virtualization system? If you restored the disk image from somewhere else or some other guest, check what the MAC address of the network adapter is, it may be the virtualization system must be configured to use that MAC for that guest.
If that does not solve it, debug on the virtualization system the network connection to that guest.

 

ok, will do.. thanks for the pointer

 

Sometimes pointers really really help... back online.. time to build something... thanks fellas