i am still working to take all this in, Thank You for this time/wisdom...
On Sat, Nov 14, 2020 at 9:12 PM Tim via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Sat, 2020-11-14 at 11:33 -0800, Jack Craig wrote:
> zone: /var/named/internal
>
>
> internal. 86400 IN SOA ws.linuxlighthouse.com.
> root.linuxlighthouse.com. 2020101601 86400 3600 604800 86400
> internal. 86400 IN NS ws.internal.
> internal. 86400 IN A 108.220.213.121
> internal. 86400 IN A 10.0.0.1
> internal. 86400 IN MX 10 mail.internal.
> mail.internal. 86400 IN A 108.220.213.122
> ws.internal. 86400 IN A 108.220.213.121
> ws.internal. 86400 IN A 10.0.0.101
> ws2.internal. 86400 IN A 10.0.0.102
> www.internal. 86400 IN A 108.220.213.121
> www.internal. 86400 IN A 10.0.0.101
Also, what names do you want resolved for internal searches?
If you put a dot at the end of the name (mail.internal. etc), that's
the whole domain name, it's not going to use it as a hostname suffixed
with your domain name. Without a dot, they'll be prefix subdomains.
e.g. For an example.com zone file, an entry like this:
www A 192.168.1.2
will answer queries for: "www.example.com"
But, an entry like this:
www. A 192.168.1.2
would be an answer for a query about: "www"
At least, that's how BIND9 works on my computers. Though I have read
that it can handle different kinds of record files, I haven't tried
them out.
Here's an entire local network domain record on my system:
$ORIGIN .
$TTL 86400 ; 1 day
example.lan IN SOA ns.example.lan hostmaster.example.lan (
359 ; serial
300 ; refresh (5 minutes)
900 ; retry (15 minutes)
3600 ; expire (1 hour)
1800 ; minimum (30 minutes)
)
NS ns.example.lan.
A 192.168.1.1
MX 1 mail.example.lan.
$ORIGIN example.lan.
mail A 192.168.1.1
ns A 192.168.1.1
web CNAME www
www A 192.168.1.1
Taking that all in line by line.
* This is the top-level record for this domain (dot origin)
* With a 1 day time-to-live for record data.
* It's the start of authority record (master records) for an
example.lan domain name.
* Records held at ns.example.lan
* Admin contact is hostmaster@xxxxxxxxxxx
* The serial number is 359 (be sure to increment it any time you
change any DNS record data).
* Check for updated records every 5 minutes (this is a LAN with
dynamic IPs, so short is okay, here).
* If the master server is unresponsive, wait for 15 minutes before
trying again (keep using your previously cached data). I haven't
optimised this setting.
* Discard any unrefreshed cached data after 1 hour.
* Other DNS servers should cache this data for at least 30 minutes,
even if they've not been able to refresh it. Yes, I know it's
different from the 1 day TTL, I'd been trying to see which figures
were obeyed, but I don't remember my test results from all those
years ago.
* The domain's NS server is ns.example.lan (note the trailing dot,
meaning this is the end of this domain name, it's not a suffix to
add example.lan to the end of it). Theoretically, I could have just
written ns by itself, with no dot at the end, and the domain name
would be appended to it.
* The example.lan domain is at 192.168.1.1
* Its priority 1 mail exchanger is mail.example.lan (again, note the
trailing dot)
* The following records are subdomains of example.lan (the probably
redundant origin line).
* The mail subdomain (mail.example.lan) is at 192.168.1.1
* The ns subdomain (ns.example.lan) is at 192.168.1.1
* A web subdomain (web.example.lan) is an alternative for the www
subdomain
* The www subdomain (www.example.lan) is at 192.168.1.1
--
uname -rsvp
Linux 3.10.0-1160.2.2.el7.x86_64 #1 SMP Tue Oct 20 16:53:08 UTC 2020 x86_64
Boilerplate: All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the mailing list.
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