,Re: caching does not seem to be working for internal view

[Timothe Litt]

Try

echo -e "[main]\ndns=none" > /etc/NetworkManager/conf.d/no-dns.conf
systemctl restart NetworkManager.service

Timothe Litt
ACM Distinguished Engineer
--------------------------
This communication may not represent the ACM or my employer's views,
if any, on the matters discussed.

On 03-Aug-22 12:36, Robert Moskowitz wrote:
>
>
> On 8/3/22 11:35, Timothe Litt wrote:
>> On 03-Aug-22 10:53, bind-users-request at lists.isc.org wrote:
>>> # cat resolv.conf
>>>
>>> My server is 23.123.122.146.  That IPv6 addr is my ATT router.
>>
>>
>> You don't want to do that.  The ATT router will not know how to 
>> resolve internal names.  There is no guarantee that your client 
>> resolver will try nameservers in order.  If you want a backup, run a 
>> second instance of named.
>>
>> As for the intermittent issues with resolving external names, that's 
>> frequently a case of hitting different nameservers.  Or a firewall.
>>
>> Get rid of the ATT router first.  Then as suggested, a packet trace 
>> will show what happens (if it still does - it could be that the ATT 
>> router's resolver is at fault).
>>
>
> Thank you for your advice.  my ifcfg-eth0 has:
>
> DEVICE="eth0"
> BOOTPROTO=none
> ONBOOT="yes"
> TYPE="Ethernet"
> NAME="eth0"
> MACADDR=02:67:15:00:00:02
> MTU=1500
> DNS1=23.123.122.146
> GATEWAY="23.123.122.158"
> IPADDR="23.123.122.146"
> NETMASK="255.255.255.240"
> IPV6INIT="yes"
>
> And I am ASSuMEing that it is that IPV6INIT that is providing that 
> IPv6 addr in resolv.cat.  So I added:
>
> DNS2=192.168.224.2
>
> And now:
>
> # cat /etc/resolv.conf
> # Generated by NetworkManager
> search attlocal.net htt-consult.com
> nameserver 23.123.122.146
> nameserver 192.168.224.2
> nameserver 2600:1700:9120:4330::1
>
> ARGH!
>
> I want the IPv6 addr from my firewall/gateway.  But I don't want that 
> IPv6 nameserver!
>
> So I added the IPv6 address for my server.  I had not done this as ATT 
> has said there is no assurance with the IPv6 addresses may change.  So 
> I added:
>
> DNS3=2600:1700:9120:4330::49
>
> and now:
>
> # cat /etc/resolv.conf
> # Generated by NetworkManager
> search attlocal.net htt-consult.com
> nameserver 23.123.122.146
> nameserver 192.168.224.2
> nameserver 2600:1700:9120:4330::1
> # NOTE: the libc resolver may not support more than 3 nameservers.
> # The nameservers listed below may not be recognized.
> nameserver 2600:1700:9120:4330::49
>
> Sigh.  I have to take that dynamic IPv6 assignment.  But I want to 
> stop it pushing into my resolv.conf.
>
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