,Re: caching does not seem to be working for internal view
Robert Moskowitz
rgm at htt-consult.com
Wed Aug 3 16:36:30 UTC 2022
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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