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Thread: nslookup error
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10-21-2013, 01:46 AM #1Junior Guru Wannabe
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nslookup error
Trying to troubleshoot an issue with my VPS [XEN - CentOS release 6.4 (Final) - virpus.com] and name lookups there are painfully slow.
Code:$ nslookup > server 8.8.8.8 Default server: 8.8.8.8 Address: 8.8.8.8#53 > aaa.com ;; connection timed out; trying next origin ;; connection timed out; no servers could be reached > bbb.com ;; connection timed out; trying next origin ;; connection timed out; no servers could be reached > ccc.com ;; connection timed out; trying next origin ;; connection timed
Last edited by JdS; 10-21-2013 at 01:51 AM.
J de Silva
GIDBlog.com
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10-21-2013, 02:42 AM #2Newbie
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Can you ping 8.8.8.8 (google DNS)? if not ask your VPS provider to check this and also check the route by traceroute and check where your packets are reaching or not.
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10-21-2013, 02:53 AM #3Web Hosting Master
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I would ask Virpus if they have a local resolver setup already, so you can use those. If not, then try using this inside of /etc/resolv.conf
nameserver 4.2.2.2
nameserver 4.2.2.3
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10-21-2013, 02:56 AM #4Junior Guru Wannabe
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As per your request:
Code:$ sudo service iptables stop iptables: Flushing firewall rules: [ OK ] iptables: Setting chains to policy ACCEPT: filter mangle na[ OK ] iptables: Unloading modules: ... $ ping -c10 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 64 bytes from 8.8.8.8: icmp_seq=2 ttl=50 time=26.7 ms --- 8.8.8.8 ping statistics --- 10 packets transmitted, 1 received, 90% packet loss, time 10000ms rtt min/avg/max/mdev = 26.745/26.745/26.745/0.000 ms ... $ traceroute 8.8.8.8 traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets 1 * * * 2 * * 67.215.227.37.static.dnsslave.com.com (67.215.227.37) 2.216 ms 3 * * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 * * * 11 * * * 12 * * * 13 * * * 14 google-public-dns-a.google.com (8.8.8.8) 26.650 ms * *
J de Silva
GIDBlog.com
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10-21-2013, 03:04 AM #5The Linux Specialist
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Seems like an issue with their router or main node.
Better wait for their reply to check this for you.
Specially 4 U
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10-21-2013, 03:17 AM #6Web Hosting Master
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10-21-2013, 04:24 AM #7Web Hosting Master
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Could it be your provider is filtering UDP, I believe nslookup will fall back to TCP lookup if UDP times out.
MattF - Since the start..
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10-21-2013, 09:33 PM #8Junior Guru Wannabe
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This was an issue with the node the server is on, according to my service provider.
They did not apologise for the lack of technical support over the weekend nor offer any explanation why they ignored my reports until Monday.
Thank you for all your comments and support. If nothing else, the discussion reassured me that it was beyond my control.
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10-21-2013, 09:42 PM #9Web Hosting Master
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Sounds like they may have had a firewall issue on the node blocking ports 53 would be my first though.
But did they even give you an explanation?
Can they give you a reason why they couldn't give technical support over the weekend? If they won't give you the time or effort for weekend technical support highly recommend you to find a new host.
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10-21-2013, 09:43 PM #10Web Hosting Master
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Their lack of support over the weekend should be a warning for you - especially if you need assistance over the weekend!
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