Hi, One of our web servers (running ISP Config 3.1.13) has had apache crash on it a couple of times in the last 3 days. So far I'm not sure if I've found the culprit but just trying to clear up any general weirdness. I see the below error in my syslog every hour bur I don't know how or what is calling these IPv6 addresses. Is the simplest option just to turn off IPv6 or is there something more sinister? Also, how do you turn off IPv6? I have copied example logs below. Thanks! spawnsworth Nov 21 11:27:11 myserver named[1230]: network unreachable resolving 'ns1.isc.ultradns.net/AAAA/IN': 2610:a1:1016::e8#53 Nov 21 11:27:11 myserver named[1230]: network unreachable resolving 'ns2.isc.ultradns.net/A/IN': 2610:a1:1015::e8#53 Nov 21 11:27:12 myserver named[1230]: network unreachable resolving 'ari.alpha.aridns.net.au/AAAA/IN': 2a01:8840:bf::1#53 Nov 21 11:27:12 myserver named[1230]: network unreachable resolving 'ari.beta.aridns.net.au/AAAA/IN': 2a01:8840:bf::1#53 Nov 21 11:27:12 myserver named[1230]: network unreachable resolving 'ari.beta.aridns.net.au/AAAA/IN': 2a01:8840:c0::1#53 Nov 21 11:27:12 myserver named[1230]: network unreachable resolving 'ari.alpha.aridns.net.au/AAAA/IN': 2a01:8840:c0::1#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'dlv.isc.org/DNSKEY/IN': 2001:4f8:0:2::19#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ns.isc.afilias-nst.info/A/IN': 2a01:8840:9::1#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'dlv.isc.org/DNSKEY/IN': 2001:500:60::30#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ns.isc.afilias-nst.info/AAAA/IN': 2a01:8840:9::1#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ns1.isc.ultradns.net/A/IN': 2610:a1:1017::e8#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ns1.isc.ultradns.net/AAAA/IN': 2610:a1:1017::e8#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ari.beta.aridns.net.au/A/IN': 2a01:8840:bf::1#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ns2.isc.ultradns.net/A/IN': 2610:a1:1017::e8#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ari.beta.aridns.net.au/AAAA/IN': 2a01:8840:bf::1#53 Nov 21 12:27:12 myserver named[1230]: network unreachable resolving 'ns2.isc.ultradns.net/AAAA/IN': 2610:a1:1017::e8#53 Nov 21 13:27:12 myserver named[1230]: network unreachable resolving 'dlv.isc.org/DNSKEY/IN': 2001:500:60::29#53 Nov 21 13:27:12 myserver named[1230]: network unreachable resolving 'ari.alpha.aridns.net.au/A/IN': 2407:6e00:253:306::73#53 Nov 21 13:27:12 myserver named[1230]: network unreachable resolving 'ari.beta.aridns.net.au/A/IN': 2407:6e00:253:306::73#53 Nov 21 13:27:12 myserver named[1230]: network unreachable resolving 'ari.beta.aridns.net.au/AAAA/IN': 2407:6e00:253:306::73#53 Nov 21 13:27:12 myserver named[1230]: network unreachable resolving 'ari.alpha.aridns.net.au/AAAA/IN': 2407:6e00:253:306::73#53 Nov 21 13:27:12 myserver named[1230]: network unreachable resolving 'dlv.isc.org/DLV/IN': 2001:502:ad09::23#53 Nov 21 13:27:12 myserver named[1230]: network unreachable resolving 'ari.beta.aridns.net.au/A/IN': 2001:dcd:2::2#53 Nov 21 13:27:13 myserver named[1230]: network unreachable resolving 'ari.delta.aridns.net.au/AAAA/IN': 2001:dcd:4::2#53 Nov 21 13:27:13 myserver named[1230]: network unreachable resolving 'ari.delta.aridns.net.au/AAAA/IN': 2001:dcd:1::2#53
Thanks, though why is it showing in the first place? Is there any context as to why this would happen? Sorry just curios! I have disabled IPv6 in bind as per instructions found here https://www.admintome.com/blog/disable-ipv6-on-ubuntu-18-04/ Thanks
Bind uses also IPv6 by default. If you host does not have IPv6 connectivity, those calls fail and show up in log. Did the error messages in log stop now? That instruction you linked to seems to disable IPv6 in the host, not just in bind. Another way to solve this is adding IPv6 connectivity to the host, then it can access those now failing resources.
