Hi Florian,
aw-systems.net appears to be delegated to the following name servers*:
pns01.dcsix.net., pns02.dcsix.net., pns03.dcsix.net.m pns04.dcsix.net.
Resolving these named leads to a circular referral:
dcsix.net NS -> pns01.kyberio-dns.com., pns02.kyberio-dns.de.
kyberio-dns.com. NS -> gns01.edge-dns.com., gns02.edge-dns.com.,
gns03.edge-dns.de., gns04.edge-dns.de.
kyberio-dns.de. NS -> gns01.edge-dns.com., gns02.edge-dns.com.
edge-dns.com. NS -> pns01.kyberio-dns.com., pns02.kyberio-dns.de.
edge-dns.de. NS -> pns01.kyberio-dns.com., pns02.kyberio-dns.de
*The TLD name servers include glue records in their referral:
;; AUTHORITY SECTION:
aw-systems.net. 172800 IN NS pns01.dcsix.net.
aw-systems.net. 172800 IN NS pns02.dcsix.net.
aw-systems.net. 172800 IN NS pns03.dcsix.net.
aw-systems.net. 172800 IN NS pns04.dcsix.net.
;; ADDITIONAL SECTION:
pns01.dcsix.net. 172800 IN A 192.174.68.13
pns01.dcsix.net. 172800 IN AAAA 2001:67c:1bc::13
pns02.dcsix.net. 172800 IN A 176.97.158.13
pns02.dcsix.net. 172800 IN AAAA 2001:67c:10b8::13
pns03.dcsix.net. 172800 IN A 192.174.68.13
pns03.dcsix.net. 172800 IN AAAA 2001:67c:1bc::13
pns04.dcsix.net. 172800 IN A 176.97.158.13
pns04.dcsix.net. 172800 IN AAAA 2001:67c:10b8::13
But these dcsix.net RR's are out of baliwick and are therefore not
accepted by BIND
For more info regarding sibling glue checking, see:
"Operational Notification: Impact of Stricter Glue Checking"
https://kb.isc.org/docs/strict-glue
/Peter
--
Peter Davies
Support Engineer
Internet Systems Corporation
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