Old 13th October 2011, 18:50
DrJohn DrJohn is offline
Join Date: Aug 2007
Location: Portland, OR, USA
Posts: 66
Thanks: 8
Thanked 2 Times in 2 Posts
Default Dns & uribl

This is Perfect Server Ubuntu 10.04. I recently changed DNS forwarders from my ISP-provided to a pair of the fastest (from here) public DNS sites: SpeakEasy and Google Public DNS. The ISP sites were about 5x slower and were returning advertising material for non-existent domains.

In /etc/bind/named.conf.options:
forwarders {
		// Google Public DNS;
I've always seen a number of DNS errors in the logs, like these from the ISP DNS servers:
DNS format error from resolving dns1.name-services.com/AAAA: invalid response: 1 Time(s)
error (FORMERR) resolving 'dns3.name-services.com/AAAA/IN': 17 Time(s)
error (network unreachable) resolving '': 2001:7b8:3:1f:0:2:53:2#53: 1 Time(s)
error (unexpected RCODE REFUSED) resolving '': 
success resolving '' (in 'bb.barracudacentral.org'?) after disabling EDNS: 1 Time(s)
but the number is small (< 50 per day) and there seems to be no impact.

After changing the DNS servers, I see a couple of hundred errors related to URIBL DNS queries (out of a 10.04 VM running ISPConfig 2.2.40 / SA) like these (many different domains overall):
error (unexpected RCODE REFUSED) resolving 'radisson.com.multi.uribl.com/A/IN': 1 Time(s)
All of these were returned from the Google Public DNS server.
In addition, I see about the same number of these and similar:
 error (network unreachable) resolving 'C.ROOT-SERVERS.NET/AAAA/IN': 2001:500:2f::f#53: 1 Time(s)
error (network unreachable) resolving 'k.gtld-servers.net/AAAA/IN': 2001:7fd::1#53: 1 Time(s)
error (network unreachable) resolving 'ns3.google.com/AAAA/IN': 2001:503:c27::2:30#53: 1 Time(s)
I'd like to clear this up on the server. Is this a symptom of 1) a problem with the local Bind installation; 2) a problem with SA / URIBL; 3) a problem with the public DNS servers; 4) not a problem other than syslog inflation?

Thanks !
Reply With Quote
Sponsored Links
Old 15th October 2011, 19:13
DrJohn DrJohn is offline
Join Date: Aug 2007
Location: Portland, OR, USA
Posts: 66
Thanks: 8
Thanked 2 Times in 2 Posts

Apparently this is a problem with the Google Public DNS. I removed it from the list of forwarders and poof! no more such log entries.

-- John
Reply With Quote
The Following User Says Thank You to DrJohn For This Useful Post:
falko (16th October 2011)


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DNS data from Standalone servers to Primary DNS server SamTzu Tips/Tricks/Mods 7 15th November 2009 14:38
Squid Proxy Caching on Linux obzerver Installation/Configuration 4 13th August 2008 20:51
Google Apps dayjahone General 19 29th March 2008 18:25
DNS Configuration Problems VMartins Installation/Configuration 10 24th July 2007 15:40
Unable send receive emails vassilis3 Installation/Configuration 15 19th May 2007 15:34

All times are GMT +2. The time now is 10:00.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.