Hi guys, I know that this topics has been already discussed in the past but unfortunately the answer gave are not really clear to me (for a my leak of knowledge :) )
On my server I can see many SERVFAIL error messages. Some of them are related to invers arp (not interested in them) other, are related to more common domani name (as youtube, facebook and google) i.e oot@banana:/var/log# cat messages.1 | grep "SERVFAIL" | grep -v "in-addr.arpa" | grep "google" Oct 22 17:05:58 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'mtalk.google.com.' because: Too much time waiting for mtalk.google.com.|A, timeouts: 5, throttles: 2, queries: 6, 8076msec Oct 22 17:05:59 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'www.google.com.' because: Too much time waiting for www.google.com.|A, timeouts: 5, throttles: 0, queries: 6, 8746msec Oct 22 17:05:59 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of '1.client-channel.google.com.' because: Too much time waiting for 1.client-channel.google.com.|A, timeouts: 5, throttles: 0, queries: 6, 8745msec Oct 22 17:05:59 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of '1.client-channel.google.com.' because: Too much time waiting for 1.client-channel.google.com.|A, timeouts: 5, throttles: 0, queries: 6, 8261msec Oct 22 17:05:59 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'www.google.com.' because: Too much time waiting for www.google.com.|A, timeouts: 5, throttles: 0, queries: 6, 8261msec Oct 22 17:05:59 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'mtalk.google.com.' because: Too much time waiting for mtalk.google.com.|A, timeouts: 5, throttles: 2, queries: 6, 8365msec Oct 22 17:06:01 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'mtalk.google.com.' because: Too much time waiting for mtalk.google.com.|A, timeouts: 5, throttles: 5, queries: 6, 8103msec Oct 22 17:06:01 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'www.google.com.' because: Too much time waiting for www.google.com.|A, timeouts: 5, throttles: 1, queries: 6, 8161msec Oct 22 17:06:01 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of '1.client-channel.google.com.' because: Too much time waiting for 1.client-channel.google.com.|A, timeouts: 5, throttles: 1, queries: 6, 8160msec Oct 22 17:06:03 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'mtalk.google.com.' because: Too much time waiting for mtalk.google.com.|A, timeouts: 5, throttles: 4, queries: 6, 8191msec Oct 22 17:06:04 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of '1.client-channel.google.com.' because: Too much time waiting for 1.client-channel.google.com.|A, timeouts: 4, throttles: 2, queries: 5, 7187msec Oct 22 17:06:04 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of '1.client-channel.google.com.' because: Too much time waiting for 1.client-channel.google.com.|A, timeouts: 4, throttles: 0, queries: 5, 7144msec Oct 22 17:06:04 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'www.google.com.' because: Too much time waiting for www.google.com.|A, timeouts: 4, throttles: 0, queries: 5, 7143msec Oct 22 17:06:04 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'mtalk.google.com.' because: Too much time waiting for mtalk.google.com.|A, timeouts: 5, throttles: 4, queries: 6, 7795msec Oct 22 17:06:06 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.11 during resolve of 'mtalk.google.com.' because: Too much time waiting for mtalk.google.com.|A, timeouts: 5, throttles: 4, queries: 6, 8446msec Oct 22 17:06:07 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'www.googleapis.com.' because: Too much time waiting for www.googleapis.com.|AAAA, timeouts: 5, throttles: 0, queries: 6, 8107msec Oct 22 17:06:08 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'clients4.google.com.' because: Too much time waiting for clients4.google.com.|AAAA, timeouts: 5, throttles: 0, queries: 6, 8053msec Oct 22 17:06:09 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'clients3.google.com.' because: Too much time waiting for clients3.google.com.|AAAA, timeouts: 5, throttles: 0, queries: 6, 8453msec Oct 22 17:06:11 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'mtalk.google.com.' because: Too much time waiting for mtalk.google.com.|AAAA, timeouts: 5, throttles: 0, queries: 6, 8380msec Oct 22 17:06:31 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'www.googleapis.com.' because: Too much time waiting for www.googleapis.com.|A, timeouts: 5, throttles: 0, queries: 6, 8513msec Oct 22 17:06:31 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'clients4.google.com.' because: Too much time waiting for clients4.google.com.|A, timeouts: 5, throttles: 0, queries: 6, 8074msec Oct 22 17:06:32 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'clients3.google.com.' because: Too much time waiting for clients3.google.com.|A, timeouts: 5, throttles: 0, queries: 6, 8295msec Oct 23 11:00:57 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'play.googleapis.com.' because: Too much time waiting for googleapis.l.google.com.|AAAA, timeouts: 4, throttles: 0, queries: 6, 8023msec Oct 23 11:02:18 banana pdns_recursor[2485]: Sending SERVFAIL to 192.168.0.12 during resolve of 'www.googleapis.com.' because: Too much time waiting for googleapis.l.google.com.|AAAA, timeouts: 4, throttles: 0, queries: 6, 8246msec Oct 23 11:11:36 banana pdns_recursor[2485]: Sending SERVFAIL to 78.152.97.196 during resolve of 'www.googleapis.com.' because: Too much time waiting for googleapis.l.google.com.|A, timeouts: 4, throttles: 0, queries: 6, 7674msec Oct 23 11:51:08 banana pdns_recursor[2485]: Sending SERVFAIL to 5.172.125.114 during resolve of 'www.youtube.com.' because: Too much time waiting for youtube-ui.l.google.com.|A, timeouts: 4, throttles: 0, queries: 6, 7465msec Now, what I have learnt in the life is that everything is possible and it could be possible that authoritative servers for youtube and google are "busy" and they don't forward the reply on-time but...it seems strange to me. There are other reasons for a SERVFAIL reply? Something could be wrong on my set-up Thank you for your time Regards Federico
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