Re: [dns-operations] db- files on secondary dns server

2014-01-21 Thread Steven Carr
On 21 January 2014 13:12, Ayca Taskin (Garanti Teknoloji) < ayc...@garanti.com.tr> wrote: > We’re using Bind DNS server with version BIND 9.9.2 as a secondary > (slave) dns server. We saw there is a lot of files starting with “db-“ > under /var/named directory and updating continuously. does an

Re: [dns-operations] most of root NS and com's NS fail from here

2014-04-29 Thread Steven Carr
On 29 April 2014 03:43, Ken Peng wrote: > I am from China, ISP telecom. > Can you tell what happens? More than likely traffic was blocked/filtered by the Chinese firewall. Take a packet capture and see what happens when you do a single query, do you get a response at all, do you get any TCP reset

Re: [dns-operations] Opened Pandora's box of Cache Poisoning

2014-05-03 Thread Steven Carr
On 3 May 2014 07:40, T.Suzuki wrote: > Additional page: > http://www.e-ontap.com/dns/pandora_acjp_e/ What exactly is this supposed to show? I think everyone on this list knows what a DNS poison/injection looks like from the point of the DNS cache/query. I'm still failing to see what this "Pandor

Re: [dns-operations] about rName translation

2014-05-31 Thread Steven Carr
On 31 May 2014 15:11, hua peng wrote: > But have a question that, how can I translate a standard email address > to a rName within SOA, and then translate it back? is there a standary > library for doing this? (I use Ruby, but py/pl are fine). Rname to Email: replace the first unescaped "." with

Re: [dns-operations] dns-operations@lists.dns-oarc.net

2012-05-07 Thread Steven Carr
I think you'll probably find that, averaged out over say a period of 1 hour, an active user will perform at least 1 query every 1-2 seconds. Twitter, Facebook, anything that uses Ajax and not to mention tons of other CDNs, Ad Networks etc. eat DNS queries like candy and then the underlying OS quer

Re: [dns-operations] Wildcard DNS for any IP address

2012-06-08 Thread Steven Carr
Link doesn't work, DNS resolution fails, ns6.gandi.net has no zone info for xip.io, so it can't resolve ns-1.xip.io - think someone needs to check their master/slave config... sjcarr@grover:~ $ dig xip.io +trace ; <<>> DiG 9.7.3-P3 <<>> xip.io +trace ;; global options: +cmd .401755

Re: [dns-operations] "best practices" for restaring internal DNS servers

2012-09-09 Thread Steven Carr
Is it really that much of an issue to have to start from an empty cache? given that >75% of the cached RRs will have a TTL of <8 hours anyway. Steve On 9 September 2012 14:45, Rubens Kuhl wrote: >> >> I'm not sure if I phrased my question correctly. It's not about >> redundancy, but about keepi

Re: [dns-operations] using different DNS providers together

2012-11-06 Thread Steven Carr
On 6 November 2012 08:34, Stephane Bortzmeyer wrote: > Why "by hand"? NOTIFY + IXFR is implemented in every name server > software, and is standard (.fr has several DNS providers, too, and we > certainly do not keep the data consistent by hand). The majority of the providers listed do not support

Re: [dns-operations] using different DNS providers together

2012-11-15 Thread Steven Carr
ue to request what they > like so that the authority service providers cannot do something. > > ________ > Liu Mingxing > > From: Steven Carr > Date: 2012-11-06 17:08 > To: DNS Operations List > CC: zhanglikun > Subject: Re: [dns-operation

Re: [dns-operations] Can you force your IPv4/v6 DNS server to return v4 responses only on recursive lookups

2013-01-15 Thread Steven Carr
The option in BIND is "filter--on-v4" and has been available since 9.7, search for the option in http://ftp.isc.org/isc/bind9/cur/9.8/doc/arm/Bv9ARM.ch06.html for the full syntax of the option. Steve On 15 January 2013 21:55, Stephan Lagerholm wrote: > I believe they have a similar option b

Re: [dns-operations] security with a firewall

2013-05-15 Thread Steven Carr
On 15 May 2013 09:13, fenghe wrote: > Does a hardware firewall help to defend the DNS attack? > If so what's the suggested policy/rules? Chances are your firewall will break long before your DNS server is overwhelmed. DNS traffic should not be firewalled, the number of UDP transactions will very

Re: [dns-operations] what type of attack is this?

2013-08-09 Thread Steven Carr
On 9 August 2013 02:51, Ken Peng wrote: > All of my six nameservers have been attacking, it's against a special > domain. > > I grep from the last 5 lines of log and get the attacking IPs as below. > Can you tell what type of attack it is and how to stop this? Thanks. Is there a reason why yo

Re: [dns-operations] what type of attack is this?

2013-08-09 Thread Steven Carr
On 9 August 2013 09:19, Jim Reid wrote: > On 9 Aug 2013, at 09:14, Ken Peng wrote: > >> My nameservers are auth-only. that means we are the auth-servers for that >> domain. > > => you have to answer those queries. If you think you're getting flooded, > consider blacklisting the source IP addres