vincenzo romero wrote:
Hello all,
I'm getting frustrated attempting to understand; I googled and asked
folks and am unable to get a straight answer.
1. How is the /etc/resolv.conf file maintained ?
If you are using DHCP, then the content of resolv.conf SHOULD be at the
mercy of your DHCLIENT and the DHCP server.
In your case you are using NetworkManager, and it is getting information
from the DHCP server to setup resolv.conf...
I do not seem to
get a consistent result when I save resolv.conf configuration from GUI
or by hand using vim /etc/resolv.conf.
If you do it by hand, it MAY get overwritten by NetworkManager, or NM
may fail to change it (depends on a couple obscure DHCP items), and then
nothing works! (been there done that at IEEE meeting last week).
a. Sometimes I the entries toggles between the two entries:
# generated by NetworkManager, do not edit!
; Use a local caching nameserver controlled by NetworkManager
nameserver 127.0.0.1
This is just bad. Perhaps the DHCP server did not supply DNS resolv
information and NM then didi 'its best'.
b. then when I restart the network services some the /etc/resolv.conf
file appears like this:
# generated by NetworkManager, do not edit!
; Use a local caching nameserver controlled by NetworkManager
search lab.mycompany.com
nameserver 192.168.17.2
This is a more typical result.
This host is:
- a DNS server that is authoritative for its domain within the
192.168.16/20 network
If it is a DNS server, then it SHOULD NOT be using DHCP to set its own
address. You should be using static addressing.
- I believe that even as DNS server, this host should have its
resolv.conf file configured to define itself as a DNS server, right?
So your first case is ALMOST right. resolv.conf should not point to the
loopback address, but to the static address of the host. But if you have
not configured NM for static addressing, well you get what you got.
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