[Pdns-users] SERVFAIL pdns-recursor

Fri Oct 30 12:06:23 UTC 2015

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 at 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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