Re: consolidating in-addr.arpa data

On Sat, 16 Sep 2023 10:22:26 +0100 (BST) "G.W. Haywood via bind-users" wrote: > Hi there, > ... >I'd be surprised if the OP couldn't manage with 2^20 IPs in a segment - > but then I guess he does work in the .gov domain. ^^^ The OP's contact

Re: Controlling which interface named uses

On Sat, 10 Jun 2023 19:24:03 +0200 Ondřej Surý wrote: > You are over-complicating things. If unconfigured, named binds the outgoing > UDP to 0.0.0.0 (::0), which means the chosen IP address is picked by the > kernel. You need to configure priorities on your interfaces in the kernel - > ip

Re: ,Re: caching does not seem to be working for internal view

On Wed, 3 Aug 2022 15:10:39 -0400 Timothe Litt wrote: > Hmm.  Your resolv.conf says that it's written by NetworkManager. > > What I suggested should have stopped it from updating resolv.conf. > > See >

Re: Stopping ddos

On Wed, 3 Aug 2022 13:47:41 +0200 Victor Johansson via bind-users wrote: > Hey, > > I just want to add that there is a better way to do this in iptables > with hashlimit. The normal rate limit in iptables is too crude. > > Below is an example from the rate-limit-chain, to which you simply

DNSSEC adoption

There has been lots of discussion recently about DNSSEC issues, including whether it's desirable to sign internal zones. Independent of this most recent issue, a couple of weeks ago I did an informal survey, using DNSVIZ, of various TLDs. I found the following rather surprising results:

Re: Windows 9.16.25 fails to start (1067 Terminated unexpectedly)

On Thu, 17 Feb 2022 15:26:35 +0100 Ondřej Surý wrote: ... > This is part of the problem - debugging on Windows is extremely painful and > requires expertise with extremely high learning curve. > > -- > Ondřej Surý — ISC (He/Him) I wonder if difficult debugging is deliberate -- it would

Re: Contents of bind-users digest...

On Tue, 6 Jul 2021 12:44:15 + "MURTARI, JOHN" wrote: > Folks, let me add my desire for a quick download dig supporting DoH. It > could really help with some testing, some ready stuff for Ubuntu 18/20, > Redhat/CentOS, could make a lot of people happy. Maybe the libs included > and we

Re: Limit actions on control channel?

It ought to be possible to write a front-end to listen on the standard control channel and only forward (properly-keyed) 'status' requests to the "real" port that BIND listens to. >From looking at the RNDC exchange via Wireshark however, you'd have to adapt >some of BIND's code that does the

Re: Need Help with BIND9

The site mxtoolbox.com has a suite of tools to check your DNS, email and Web servers from the outside. They're easy to use and might turn up something. On Fri, 11 Jun 2021 09:10:32 -0700 techli...@phpcoderusa.com wrote: > Hi, > > The two domains I am working with on my SOHO home server are 1)

Re: No more support for windows

On Fri, 4 Jun 2021 13:58:40 -0700 Gregory Sloop wrote: > This feels a lot like responding to trolls, but I'll instead assume that > you're asking (or making a point) in good faith. > > So, we'll stipulate that - you're actually interested in truth and knowledge. > > So, it's easily compiled

Re: Syslog with BIND on CentOS

If you can have BIND log directly to a file, couldn't you use a FIFO (prwxrwxrwx) or Unix domain socket (srwxrwxrwx) and avoid the disk I/O by sending the log data directly to the forwarder? (E.g., Pulse Audio listens on a socket for audio data from an application, and sends it in real-time to

Re: where are the testing docs ?

Actually, it's in keeping with the *original* definition of hacking! On Sun, 9 May 2021 23:55:13 -0600 @lbutlr wrote: > On 06 May 2021, at 09:57, Dennis Clarke via bind-users > wrote: > > I do NOT trust a build result where I had to go hacking into all the > > Makefiles just to get it to

Re: Using RNDC to control remote access to my BIND server

A couple of years ago, I tried using nsupdate to modify a dynamic (DHCP) IP address for my very simple domain. It worked, except that it totally messed up the organization of the zone file. Since the file only has 44 active lines (which are organized logically), I maintain it by hand. After

Re: Preventing a particular type of nameserver abuse

Interesting, although we host different domains, in and from different geographic areas, we got the same queries as yours on the same day, with some at about the same time (we're EDT). 13-Apr-2021 02:19:58.468 security: info: client 76.20.145.58#3074 (sl): query (cache) 'sl/ANY/IN' denied

Re: Preventing a particular type of nameserver abuse

Interesting observation. I just did lookups on 4 recent (< 24 hrs ago) 'sl/ANY/IN' queries logged by our BIND and got: 2 Comcast cable IPs (hsd1.tx.comcast.net and hsd1.ma.comcast.net) 1 OVH Hosting IP (Montreal) 1 Afranet IP (Tehran!) The whois info for the OVH IP contains the line:

Re: Preventing a particular type of nameserver abuse

We also get *lots* of suspicious queries of the same kind, from various privileged and unprivileged ports, which I'm pretty sure are DDoS attempts. For example: 12-Apr-2021 23:44:17.767 security: info: client 107.213.131.17#80 (sl): query (cache) 'sl/ANY/IN' denied 12-Apr-2021 23:44:19.477

Re: BIND 9.16.13 and Mac OS X 10.13.6 - problems with ./configure

Well said! On Mon, 29 Mar 2021 16:11:54 +0100 Tony Finch wrote: > alcol alcol wrote: > > > seriously? is like linux/unix FAQ  > > Please, if you can't be helpful, don't reply at all. We all have to learn > somehow, and the best way to show your knowledge is to share it generously. > >

Re: lists.isc.org and DMARC

Our DMARC Policy has been "p=quarantine" since 30 Jun 2019, so I guess it won't affect us. (It was "p=none" before that -- we only started using DKIM in Apr 2017.) On Tue, 16 Feb 2021 20:54:30 + (UTC) Dan Mahoney wrote: > Greetings bind-users netizens. > > Dan Mahoney, ISC SysAdmin

Re: Problems with interfaces going down

Would it be possible to use a virtual interface from within bind/named that gets mapped by some privileged facility to a hardware interface? (This is the sort of thing that VMs have to do all the time.) For example, could a brctl bridge help? Or maybe CAP_NET_BIND_SERVICE would allow the

Re: Bind 9.11 serving up false answers for a single domain.

I don't think tcpdump was installed by default with various versions of Debian that I set up in the last few years for networking. I didn't bother to install it, as it's output is different enough (old fashioned?) from the sharks to be annoying. It *was* installed with OpenSuSE 15.2 though.

Re: Bind 9.11 serving up false answers for a single domain.

I rather prefer tshark to tcpdump: it's essentially the command line version of wireshark, and thus has wireshark's protocol "dissecting" abilities. On Wed, 10 Feb 2021 22:20:08 + "John W. Blue via bind-users" wrote: > Three words: tcpdump and wireshark > > It is like peanut and jelly

Re: Bind 9.11 serving up false answers for a single domain.

Do you know about mxtoolbox.com? It (and other similar sites) does a good job of diagnosing DNS-related problems. I use it now and then to check out my own sites, as it gives a "second opinion". In particular its "DNS Lookup' function reported the following for "internet-dns1.state.ma.us"

Re: Scripting dnssec-verify - processing command output

It sounds to me like dnssec-verify is sending the output in question to STDERR instead of STDOUT. On Sat, 06 Feb 2021 19:02:28 + Matthew Richardson wrote: > I have been using Perl to do a reasonable amount of scripting, running bind > utilities and processing the results into variables.

Re: Two copies of recent posts

> On Tue, 2020-11-24 at 22:22 -0500, Paul Kosinski wrote: > > My reading of the headers (below) does *not* suggest "Reply All". > > > > Rather, they show that mx.pao1.isc.org sent/forwarded the email once, > > and it was received by lists.isc.org once with E

Re: Two copies of recent posts

t 21:56 -0500, Paul Kosinski via bind-users wrote: > > I've been getting two identical copies of recent posts to this list... > > Me too, but it's because of people hitting reply-all thinking that they > are replying to the list and the poster. People really need to verify > who

Two copies of recent posts

I've been getting two identical copies of recent posts to this list (such as this item). This only started happening in the past 24 hours or so. Is anyone else seeing this? Upon examination of the headers of the two copies, it looks like ISC's list-servers are doing the duplication. (The first

Re: How can I launch a private Internet DNS server?

With regard to using chroot, hasn't named/BIND long had the "-u" (user) and "-t" (directory) options to accomplish the same thing more easily? On Fri, 16 Oct 2020 12:47:35 -0500 Chuck Aurora wrote: > /me catching up on earlier parts of this thread, > > On 2020-10-15 11:42, alcol alcol wrote:

Re: Deconstructing the Great Firewall of China

The article is from 2016, probably before DNSSEC become so widespread. But I would guess that their current overall approach is not a radical departure from what was outlined in the article. On Tue, 23 Jun 2020 13:41:18 +0200 Alessandro Vesely wrote: > On 2020-06-05 9:29 p.m., Paul Kosin

Deconstructing the Great Firewall of China

A very interesting article on how China uses DNS (among other things) to "control" Internet usage. https://blog.thousandeyes.com/deconstructing-great-firewall-china/ ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from

Re: DoH plugin for BIND

ernet connection" > > > Even if your ISP allows it, chances are that other mail servers will reject > > it > > that's a completl different story > > > On 5/2/20 3:30 PM, Paul Kosinski via bind-users wrote: > >> How many ISPs allow traffi

Re: DoH plugin for BIND

How many ISPs allow traffic on port 25? My impression is that even many (non-enterprise) business customers can't use port 25. On Sat, 2 May 2020 09:28:54 +0200 Reindl Harald wrote: > Am 02.05.20 um 09:00 schrieb Michael De Roover: > > That's actually my biggest concern with DoH, ISP blocking.

Re: Problem to transfer reverse zone DNS on secondary DNS servers

I was pleased that I was able to get our two (successive) ISPs to set up reverse DNS for our small number of IP addresses, and each twice to change them when they moved us to moved us to new IP ranges (due to the IPv4 crunch). It never even occurred to me that it might be possible to have them

Peculiar DNS queries

134.0.217.53#27016 (WWw.imENT.cOm): query: WWw.imENT.cOm IN A -E (216.55.100.245) Dec 22 12:05:44 iment0 named[10333]: client 134.0.217.69#23417 (WWw.IMeNt.cOM): query: WWw.IMeNt.cOM IN A -E (216.55.100.245) Thanks, Paul Kosinski ___ Please visit https

Re: Zoneformat

"... long ago adapted to using full numbers, including area codes, for pretty much *all* phone dialing ..." Except that that proved to be so onerous that people often use "speed dialing" for commonly dialed numbers. (Not to mention the fact that people usually address their friends and coworkers

Re: search and ndots support in bind utilities

Following https://www.icann.org/en/system/files/files/sac-064-en.pdf, it sounds like modest groups of Internet users (such as informal clubs) that don't have their own official domain (like "iment.com") are out of luck if they would like to have local subdomains -- unless they want to use the

DMARC test

Testing how lists.isc.org handles DMARC "Quarantine" (and "Reject") policy. The enterpr...@mozilla.org mailing list forwards such email in a way that some recipients choke on it (i.e., can't validate it). ___ Please visit

Re: Barclays bank domain unresolvable only on some servers

A *bank* not using DNSSEC?? Glad I don't have any money there. On Sun, 16 Jun 2019 14:00:36 +0100 (BST) "G.W. Haywood via bind-users" wrote: > Hi there, > > On Sun, 16 Jun 2019, Mark Andrews wrote: > > > The servers for this zone are broken, they do not respond to > > queries with DNS

Re: Help: BIND _ Recursive query

? On Mon, 4 Mar 2019 19:30:36 +0100 Matus UHLAR - fantomas wrote: > >On 4 Mar 2019, at 16:20, Paul Kosinski wrote: > >> provides our users with general caching DNS service for > >> all other domains. > > > >[...] > > > >> Its "named.conf"

Re: Help: BIND _ Recursive query

We have a BIND server on our LAN which is authoritative for our ".local" domain and also provides our users with general caching DNS service for all other domains. Its "named.conf" file doesn't list any "forwarders" any more, and "forward-only" is gone, but it still has a leftover "recursion yes"

Re: Forward zone inside a view

I haven't analyzed the details and pitfalls, but could a Web proxy mechanism of some sort be of help? In particular, rather than having your users directly access "teamviewer.org" (or whatever), have them to access "teamviewer.local", which is resolved by your internal DNS to a specialized proxy

Re: Question about visibility

Maybe port scanners will find open ports pretty quickly, but I've found that using non-standard ports is helpful in reducing traffic, at least. For example, SSH on port 22 gets lots of SYNs but moving it elsewhere, and making 22 totally unresponsive discourages most such attempts. This increases

Re: Operational Notification: Some releases of BIND are too strict when handling referrals containing non-empty answer sections

Code refactoring is nothing compared to what Mozilla did to Firefox! It's hard to believe they didn't change the name, given that they totally changed the add-on interface and thereby removed so many of the features that made Firefox our browser of choice. On Thu, 20 Sep 2018 09:48:08 +0100

Re: SRV record not working

t, 18 Aug 2018 20:12:01 +0200 Reindl Harald wrote: > > > Am 18.08.2018 um 20:02 schrieb Paul Kosinski: > > When I started using Linux almost 20 years ago, I think there was > > only nslookup, and no dig. So by habit, I tend to use it unless the > > extra power of dig ou

Re: SRV record not working

When I started using Linux almost 20 years ago, I think there was only nslookup, and no dig. So by habit, I tend to use it unless the extra power of dig outweighs its extra complexity. I don't remember what I used on Windows back when I was regularly using both. On Sat, 18 Aug 2018 11:42:20

DMARC question

We have a couple of small domains whose DNS is served by BIND on our dedicated machines. Almost 3 years ago we had set up DMARC records, and were getting reports from various MXs every day until a couple of days ago (Aug 13). Then they suddenly stopped! Nothing in the BIND config or zone files

Re: Domain name based multihome routing?

We do something somewhat similar with our LAN. We have a new cable connection and an old DSL connection. The cable is 60x faster, but has a dynamic IP and blocks various ports (esp. 25), so we keep the DSL so we can send email directly etc. Obviously, we don't want to stream video or even do much

Re: Stopping name server abuse

Most of your replies seem not to address the (immediately preceding) paragraph they appear to be responding to. On Mon, 25 Jun 2018 22:15:07 +0200 Reindl Harald wrote: > > > Am 25.06.2018 um 22:01 schrieb Paul Kosinski: > > Somebody who has irresponsibly (and apparently want

Re: Stopping name server abuse

assisting in the attack, and should be contacted and asked to help in the remediation. (Note that *their* resources, as well as yours, are being wasted.) On Mon, 25 Jun 2018 17:47:23 +0200 Reindl Harald wrote: > Am 25.06.2018 um 17:37 schrieb Barry Margolin: > > In article , > &

Re: Stopping name server abuse

esn't come until after the connection is established.) On Mon, 25 Jun 2018 15:32:44 +0200 Reindl Harald wrote: > > > Am 25.06.2018 um 05:39 schrieb Paul Kosinski: > > Is it possible to get BIND not to respond at all, thereby causing > > a timeout on the query? That woul

Re: Stopping name server abuse

Is it possible to get BIND not to respond at all, thereby causing a timeout on the query? That would perhaps reduce load more than NXDOMAIN or deleting the sone(s) would. On Mon, 25 Jun 2018 00:03:09 +0200 jo...@hasig.de wrote: > yes, but it minimizes the use of resources because the only

Re: DNSSEC and nsupdate

Setting the permissions of a *private* key to 0644 sounds like a bad idea. Maybe you mean 0640? On Fri, 2 Mar 2018 23:28:28 + "Prof. Dr. Michael Schefczyk" wrote: > Dear Mark, > > I did get the issue resolved while setting up a test environment. > > The issue is

Re: DNS performance Help when query log is off -- which default parameters will impact the DNS performance

Google search for "man named" turns up: https://ftp.isc.org/isc/bind9/cur/9.9/doc/arm/man.named.html which says (among more details): named [-4] [-6] [-c config-file] [-d debug-level] [-E engine-name] [-f] [-g] [-M option] [-m flag] [-n #cpus] [-p port] [-s] [-S #max-socks] [-t

Re: DNS performance Help when query log is off -- which default parameters will impact the DNS performance

Could it be that you're network limited? In any case, the values of the following parameters may be illuminating (they may be obtained via "rndc status"). CPUs found worker threads UDP listeners per interface For example, my very lightly loaded authoritative server reports: version:

Re: SOA settings

Speaking of units, University of Chicago Professor Nicholas Metropolis (who had been one of the original Manhattan Project scientists at Los Alamos) remarked that the standard lecture period of 50 minutes lasted approximately 1 Micro-Century. On Fri, 2 Feb 2018 17:00:10 -0500 Warren Kumari

Re: Zone give from one second to another error...

Michelle (and others who may be interested), I have found mxtoolbox.com to be helpful in diagnosing DNS and related problems. It is able do all kinds of DNS lookups from *outside* your domain so you can see what your normal Internet users see. It will do basic stuff (manually initiated) for free,

Re: search algorithm in DNS

strings of characters, but rather follow certain linguistic statistics.) On Thu, 9 Nov 2017 17:56:03 +0100 Reindl Harald <h.rei...@thelounge.net> wrote: > > > Am 09.11.2017 um 15:55 schrieb Paul Kosinski: > > Exact matching needs a search algorithm too > > no

Re: search algorithm in DNS

Exact matching needs a search algorithm too. If the DNS server in only authoritative for a couple of domains (and subdomains), a simple linear search would be adequate (or even optimal, due to its low overhead). Many DNS servers, however, are authoritative for multiple domains, and so might need

Re: Different forwarder for certain response ip (result ip )

Maybe he has no say in what ISP is used, and they have draconian policies... On Sat, 16 Sep 2017 19:48:51 +0200 Matus UHLAR - fantomas wrote: > . . . > >Note:1.2.3.4 is not what they really return . I've changed it for > >privacy . > > why? it's your ISP, there's no need to

Re: make AAAA type the default for dig

Has IPv4 faded away and I didn't notice? Unlike the well planned switch to Area Codes, IPv6 is not backward compatible. (The telcos would have gotten rather a lot of complaints if they said every had to get a new telephone number, and also -- new telephones.) On Wed, 14 Jun 2017 22:10:25 +1000

Re: Tuning suggestions for high-core-count Linux servers

It's been some years now, but I had worked on developing code for a high throughput network server (not BIND). We found that on multi-socketed NUMA machines we could have similar contention problems, and it was quite important to make sure that threads which needed access to the same memory areas

Re: Slow zone signing with ECDSA

"The tinfoil hat brigade in some distributions has resisted using them, fearing some conspiracy to provide not-so-random numbers." I think the NSA *did*, in fact, compromise the "Dual Elliptic Curve Deterministic Random Bit Generator" and paid RSA to make it the default in one of their products

Re: BIND 9 windows XP builds

inder to > upgrade/replace/refresh their XP boxes? > > > - > Kevin > > > > -Original Message- > From: bind-users [mailto:bind-users-boun...@lists.isc.org] On Behalf > Of Paul Kosinski Sent: Tuesday, April 18, 2

Re: BIND 9 windows XP builds

- Kevin > > -Original Message- > From: bind-users [mailto:bind-users-boun...@lists.isc.org] On Behalf > Of Paul Kosinski Sent: Monday, April 17, 2017 9:08 PM > To: bind-users@lists.isc.org > Subject: Re: BIND 9 windows XP builds > > I can see som

Re: BIND 9 windows XP builds

I can see somebody running XP for some "legacy" software that doesn't run nicely on newer versions of Windows, but I would think it extremely risky to have such a machine connected to the Internet. Maybe whoever runs BIND on XP should consider converting that machine to Linux, and running BIND on

Re: Bind Queries log file format

"I’ve been around long enough to remember when upward compatibility was something that was expected." Having been around since before even Unix, I must say I agree totally. As I understand it, Linus does not take kindly to Linux Kernel changes that break forward/upward compatibility (of the

Re: Forwarding via different external networks

self could fail-over the DNS lookups and solve the immediate problem. On Sat, 27 Aug 2016 23:29:08 -0700 Dave Warren <da...@hireahit.com> wrote: > On Sat, Aug 27, 2016, at 11:32, Paul Kosinski wrote: > > So my question is, is it possible to configure my forwarding BIND to > >

Re: Forwarding via different external networks

2016 at 02:32:42PM -0400, Paul Kosinski wrote: > > Currently, I forward all outbound DNS via the DSL to the ISP's > > DNS servers. (I have more confidence in the DSL provider not > > interfering with DNS than in Comcast.) > > FWIW, it has been many years since I have dea

Forwarding via different external networks

I have a rather unusual network with a gateway machine that connects to two ISPs: a slower DSL with a static IP and a faster cable (Comcast) with a DHCP IP. The gateway machine runs two instances of BIND (plus the usual firewalling): an authoritative one for a couple of domains (and only those

Re: how to log client MAC address?

If the client is at all remote (i.e. the request passes through a router), the MAC address isn't preserved. On Sat, 6 Aug 2016 17:42:59 -0700 Fima Leshinsky wrote: > I'd like to log the client's MAC address. Is this possible? Could > someone point me in the right

Re: outgoing-traffic

I thought port 0 was never valid as either source or destination. On Wed, 27 Jul 2016 11:22:06 +0300 "Ejaz" wrote: > > Thanks you. > > The traffic will go to router which is handled by the Network dept. > The fear that may router can crash if we start enabling the

Re: Shared libraries loaded after chroot

I have avoided the problem chroot causes in a fairly general fashion by using "mount --bind". For example: /bin/mount --bind /lib /chroot/dns/lib will make the entire /lib directory available to the chrooted BIND, assuming the path /chroot/dns is created beforehand to serve as the chroot base

Re: Nsupdate usage scenario

Interesting idea -- it never occurred to me that I could have separate zone files for sub-domains. So, if I had a tiny zone file for "dynamic.example.com" alone, and a bigger zone file for all the other stuff for "example.com", could I be *sure* that nsupdate would *only* modify the tiny file,

Nsupdate usage scenario

I was trying to use nsupdate to automatically update a single A record in our domain to its latest dynamic, but public, IP address. Although it did indeed rewrite the zone file to reflect the new IP address, it also rearranged all the entries in the file into seemingly random order (maybe sorted