I have setup a dns server with named bind-9.11.1-8.P3.fc27.x86_64 on
Fedora 27.
This is the DNS1 server for my notebook an all local lan
(192.168.61.254)
The problem is that when bandwidth is fully occupy (download some big
data), the DNS cannot resolve new name not in cache
[ lesca@dodo ~]$ host
getfedora.org 192.168.61.254
Using domain server:
Name: 192.168.61.254
Address: 192.168.61.254#53
Aliases:
Host
getfedora.org not found: 2(SERVFAIL)
If I try to resolve this name via 8.8.8.8, I can resolve it
[ lesca@dodo ~]$ host
getfedora.org 8.8.8.8
Using domain server:
Name: 8.8.8.8
Address: 8.8.8.8#53
Aliases:
getfedora.org has address 152.19.134.198
....
getfedora.org has IPv6 address
2605:bc80:3010:600:dead:beef:cafe:fed9
getfedora.org has IPv6 address 2610:28:3090:3001:dead:beef:cafe:fed3
getfedora.org has IPv6 address 2604:1580:fe00:0:dead:beef:cafe:fed1
getfedora.org mail is handled by 10
mx1.redhat.com.
getfedora.org mail is handled by 20
mx2.redhat.com.
I have also try to configure bind to forward only to some forwarders
(es. 8.8.8.8; 8.8.4.4;) but the problem is the same: bind do not
resolve and 8.8.8.8 yes
NOTE: This problem with old version of BIND (Fedora 19) do not occurs
Someone can help me to investigate on this problem and howto resolve or
mitigate this problem?
Many thanks
--
Dario Lesca
(inviato dal mio Linux Fedora 27 Workstation)