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old version was 4.1.18, it was problematic</div>
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after update, the problem didnt happened unless the NS server actually get timeout.</div>
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Regards</div>
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<p style="margin-top:0px; margin-bottom:0px"><span style="color:rgb(31,73,125)"></span><span style="font-size:10pt; color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p style="margin-top:0px; margin-bottom:0px"><b><span style="font-size:10pt; color:rgb(31,73,125)">Mohamad Barham<u></u></span></b></p>
<p style="margin-top:0px; margin-bottom:0px"><span style="font-size:10pt; color:rgb(31,73,125)">System Engineer | Information Technology Department<u></u><u></u></span></p>
<p style="margin-top:0px; margin-bottom:0px"><span style="font-size:10pt; color:rgb(31,73,125)">Birzeit University<u></u><u></u></span></p>
<p style="margin-top:0px; margin-bottom:0px"><span style="color:rgb(31,73,125); font-family:Calibri,sans-serif; font-size:13.3333px">P.O.Box. 14, Birzeit, Palestine</span><br>
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<span style="color:rgb(31,73,125); font-family:Calibri,sans-serif; font-size:13.3333px">Tel: + 970 22982012 | Mob: +970 597 861929 | Ext: 5616</span>
<p style="margin-top:0px; margin-bottom:0px"><span style="font-size:10pt; color:rgb(31,73,125)"><span style="color:blue">mbarham@birzeit.edu</span> | </span><span style="color:rgb(31,73,125)"><a href="http://www.birzeit.edu/" target="_blank" style="color:rgb(17,85,204)"><span style="font-size:10pt; color:blue">www.birzeit.edu</span></a></span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Pdns-users <pdns-users-bounces@mailman.powerdns.com> on behalf of Mohamad F Barham via Pdns-users <pdns-users@mailman.powerdns.com><br>
<b>Sent:</b> Monday, July 18, 2022 4:08 PM<br>
<b>To:</b> pdns-users@mailman.powerdns.com <pdns-users@mailman.powerdns.com><br>
<b>Subject:</b> [Pdns-users] strange timeout issues on random basis</font>
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Dears,</div>
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I have sometime an unexpected behavior regarding my pdns-recursor </div>
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updated to 4.7.1</div>
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running on centos 7</div>
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4 cores</div>
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unexpected behavior: </div>
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getting timeout on existing domains for a while, after a while get resolved!!!</div>
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the issue is so critical as some times gmail as ex. did not solve , and emails get unroutable address and not delivered</div>
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for example:</div>
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Jul 18 14:42:45 resolver02 pdns-recursor: Sending SERVFAIL to 172.20.20.51:60435 during resolve of 'rms.pmof.ps' because: Too much time waiting for pmof.ps|A, timeouts: 2, throttles: 0, queries: 4, 9000msec
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] : no TA found for 'rms.pmof.ps' among 1</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] : no TA found for 'pmof.ps' among 1</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] : no TA found for 'ps' among 1</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] : got TA for '.'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] QM rms.pmof.ps.|A child=(empty): doResolve</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: Wants NO DNSSEC processing, auth data in query for 1</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: Recursion not requested for 'rms.pmof.ps|1', peeking at auth/forward zones</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] QM rms.pmof.ps.|A child=(empty): Step0 Not cached</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: Checking if we have NS in cache for 'rms.pmof.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: no valid/useful NS in cache for 'rms.pmof.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: Checking if we have NS in cache for 'pmof.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: no valid/useful NS in cache for 'pmof.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: Checking if we have NS in cache for 'ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'fork.sth.dnsnode.net'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'ps-ns.anycast.pch.net'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'rip.psg.com'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'ps.cctld.authdns.ripe.net'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'dns1.gov.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: within bailiwick: 1, in cache, ttl=86400</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'ns1.pnina.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: within bailiwick: 1, in cache, ttl=86400</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] rms.pmof.ps: We have NS in cache for 'ps' (flawedNSSet=0)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] QM rms.pmof.ps.|A child=(empty): Step1 Ancestor from cache is ps</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] QM rms.pmof.ps.|A child=pmof.ps: Step2 New child</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] QM rms.pmof.ps.|A child=pmof.ps: Step4 Resolve A for child</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Wants NO DNSSEC processing, auth data in query for 1</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: No cache hit for 'pmof.ps|1', trying to find an appropriate NS record</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Checking if we have NS in cache for 'pmof.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: no valid/useful NS in cache for 'pmof.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Checking if we have NS in cache for 'ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'fork.sth.dnsnode.net'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'ps-ns.anycast.pch.net'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'rip.psg.com'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'ps.cctld.authdns.ripe.net'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: within bailiwick: 0, not in cache / did not look at cache</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'dns1.gov.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: within bailiwick: 1, in cache, ttl=86400</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: NS (with ip, or non-glue) in cache for 'ps' -> 'ns1.pnina.ps'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: within bailiwick: 1, in cache, ttl=86400</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: We have NS in cache for 'ps' (flawedNSSet=0)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Cache consultations done, have 6 NS to contact</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps.: Nameservers: dns1.gov.ps(0.00ms), ps.cctld.authdns.ripe.net(0.00ms), ns1.pnina.ps(0.00ms),</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps.: rip.psg.com(0.00ms), ps-ns.anycast.pch.net(0.00ms), fork.sth.dnsnode.net(0.00ms)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Trying to resolve NS 'dns1.gov.ps' (1/6)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] Nameserver dns1.gov.ps IPs: 213.244.82.147(0.00ms)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Resolved 'ps' NS dns1.gov.ps to: 213.244.82.147</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Trying IP 213.244.82.147:53, asking 'pmof.ps|1'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: timeout resolving after 3000.12msec</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Trying to resolve NS 'ps.cctld.authdns.ripe.net' (2/6)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] Nameserver ps.cctld.authdns.ripe.net IPs: 193.0.9.105(0.00ms), 2001:67c:e0::105(0.00ms)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Resolved 'ps' NS ps.cctld.authdns.ripe.net to: 193.0.9.105, 2001:67c:e0::105</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Trying IP 193.0.9.105:53, asking 'pmof.ps|1'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: timeout resolving after 3000.3msec</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Trying IP [2001:67c:e0::105]:53, asking 'pmof.ps|1'</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: hit a local resource limit resolving, probable error: Network is unreachable</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Trying to resolve NS 'ns1.pnina.ps' (3/6)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] Nameserver ns1.pnina.ps IPs: 194.6.225.20(0.00ms)</div>
<div>Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Resolved 'ps' NS ns1.pnina.ps to: 194.6.225.20</div>
Jul 18 14:42:45 resolver02 pdns-recursor: [18037] pmof.ps: Trying IP 194.6.225.20:53, asking 'pmof.ps|1'<br>
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my config:</div>
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setuid=pdns-recursor
<div>setgid=pdns-recursor</div>
<div><br>
</div>
<div>local-address=0.0.0.0 ::</div>
<div>local-port=53</div>
<div>allow-from=172.16.0.0/12,192.168.0.0/16,10.0.0.0/8,176.119.248.0/21,213.244.124.0/22</div>
<div><br>
</div>
<div>threads=2</div>
<div><br>
</div>
<div>pdns-distributes-queries=no</div>
<div>reuseport=no</div>
<div><br>
</div>
<div>#### forwarding zones##</div>
<div>#forward-zones-file=/etc/pdns-recursor/forward-zones</div>
<div>#lua-config-file=/etc/pdns-recursor/lua-config-file</div>
<div><br>
</div>
<div>### DNSSEC ####</div>
<div>dnssec=off</div>
<div><br>
</div>
<div>##### Logs ####</div>
<div>log-common-errors=yes</div>
<div>loglevel=5</div>
<div>logging-facility=0</div>
<div>disable-syslog=no</div>
<div><br>
</div>
<div>## packet cache serv fail</div>
<div>packetcache-ttl=60</div>
<div>packetcache-servfail-ttl=15</div>
<div>max-negative-ttl=15</div>
<div>minimum-ttl-override=30</div>
<div>#max-cache-ttl=3600</div>
<div>##unlimeted recursion depth, increase stack as a result</div>
<div>max-recursion-depth=50</div>
<div>stack-size=400000</div>
<div>network-timeout=3000</div>
<div>client-tcp-timeout=15</div>
<div><br>
</div>
<div>server-down-max-fails=16</div>
<div>trace=fail</div>
<br>
</div>
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# all others are default</div>
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<p style="margin-top:0px; margin-bottom:0px"><span style="color:rgb(31,73,125)"></span><span style="font-size:10pt; color:rgb(31,73,125)"><u></u><u></u></span></p>
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<p style="margin-top:0px; margin-bottom:0px"><b><span style="font-size:10pt; color:rgb(31,73,125)">Mohamad Barham<u></u></span></b></p>
<p style="margin-top:0px; margin-bottom:0px"><span style="font-size:10pt; color:rgb(31,73,125)">System Engineer | Information Technology Department<u></u><u></u></span></p>
<p style="margin-top:0px; margin-bottom:0px"><span style="font-size:10pt; color:rgb(31,73,125)">Birzeit University<u></u><u></u></span></p>
<p style="margin-top:0px; margin-bottom:0px"><span style="color:rgb(31,73,125); font-family:Calibri,sans-serif; font-size:13.3333px">P.O.Box. 14, Birzeit, Palestine</span><br>
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<span style="color:rgb(31,73,125); font-family:Calibri,sans-serif; font-size:13.3333px">Tel: + 970 22982012 | Mob: +970 597 861929 | Ext: 5616</span>
<p style="margin-top:0px; margin-bottom:0px"><span style="font-size:10pt; color:rgb(31,73,125)"><span style="color:blue">mbarham@birzeit.edu</span> | </span><span style="color:rgb(31,73,125)"><a href="http://www.birzeit.edu/" target="_blank" style="color:rgb(17,85,204)"><span style="font-size:10pt; color:blue">www.birzeit.edu</span></a></span></p>
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