You've got your own BIND server with a static, public IP address, and your own domain which you host on it. You've also got one or more machines on dynamic public IP addresses - perhaps your or your customers' or friends' home machines, or small offices in areas that don't offer static addresses - and you want to use your own equipment to maintain DNS records to point to the.
Scripts to update a dynamic Bind DNS entry
############################################################History
Many people use free Dynamic DNS services to reach systems behind dynamicIP addresses. Many of the free services limited their service offer overthe time, or the service depends on buying a product (like a DSL router).
With bind9 it is easily possible to setup your own dynamic DNS service.
This set of scripts use the 'nsupdate' tool and authenticated communication,to update the DNS entries.
############################################################Files
bin/dns-update.pl
The script which executes the update.
Parameters:
- key file
- dynamic DNS hostname
- new IP address
conf/transfer.key
Example configuration file (hint: the key in the file is justa demo, change it!) For the purpose of 'dns-update.pl', only thefirst section is required.
conf/ontheroad.example.com.zone
Example zone.
http/my_ip.php
Script which returns the current IP address used by the client.
http/dynamic-update.php
Script which updates the dynamic DNS entry for the client.
############################################################Bind9 configuration
Since the dynamic updates are written to a separate file, itmakes sense to store the entire hostname in a separate file.Make sure that bind9 can create new files in this directory:
mkdir /etc/bind/updateschown bind:bind /etc/bind/updates
Add to /etc/bind/named.conf.local:
include '/etc/bind/transfer.key';zone 'ontheroad.example.com' {type master;file '/etc/bind/updates/ontheroad.example.com.zone';allow-transfer {key 'transfer';};allow-update {key 'transfer';};};
A sample file for the 'ontheroad.example.com' zone, as wellas a 'transfer.key' example are included in the conf/ directory.Make the changes and reload the bind9 configuration. Make surethat there are no errors.
############################################################How to dynamic update the hostname?
./dns-update.pl transfer.key ontheroad.example.com 10.0.0.20
Using another website which returns the current public IP address,this script can be used in a cron job, or whenever an interfaceis coming up. See also the 'webserver' section later in thisdocument:
./dns-update.pl transfer.key ontheroad.example.com lynx -source -dump http://example.com/my_ip.php
############################################################How to generate the bind9 key?
Here's a way to generate the key for bind9:
cd /tmp/dnssec-keygen -a HMAC-MD5 -b 256 -n HOST transferls -ld transfer
The file ending on '.key' contains a new key.
https://luckyson.netlify.app/free-windows-81-pro-product-key-generator.html. ############################################################Using a webserver for clients without 'nsupdate' program
In case a client has no 'nsupdate' program (embedded client,mobile client, ..), a webserver can play the relay for updatingthe dynamic DNS entry.
The 'http/' directory contains two small PHP scripts.
'my_ip.php' just returns the official IP address used by theclient. This can be used to execute 'dns-update.pl', when behinda NAT.
'dynamic-update.php' is called with a 'host' parameter, thenthe script will update the dynamic DNS entry using the client'sIP address.
############################################################To-do
There are several possible improvements:
- only change the dynamic DNS entry when the new IP address isdifferent from the existing one
- differentiate between IPv4 and IPv6 addressesright now the script only allows one address, either IPv4 orIPv6
Bind Dynamic Update Key Generation 10
This document is about setting up a dynamic DNS entry for a system on the internet without a static IP. The process involves two systems:
- Server: static IP, running BIND (int0x80.com)
- Home: dynamic IP, running Debian
I created a sub-domain, dyn.int0x80.com, to which hosts can be added.
The document asserts a working BIND setup already in place. Installing and configuring BIND is out of scope here.
Key Generation
First step is to generate a key on the server.
This creates two files, which will be named differently based on individual runs.
Here are the sanitized contents of each file.
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Khome.dyn.int0x80.com.+157+62567.key:
Bind Dynamic Update Key Generation Download
Khome.dyn.int0x80.com.+157+62567.private:
Notice that the Key: field in the .private file is simply the concatenated key from the .key file.
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Key File
Next I created a key file at /etc/bind/key.home.dyn.int0x80.com.
Then add the following line to /etc/bind/named.conf.local to include the new key.
Dynamic Zone
The key is situated on the server, all that remains is to add a zone for BIND. This is my entry further down in /etc/bind/named.conf.local:
Lastly put the /etc/bind/db.dyn.int0x80 file into place.
Restart BIND with a simple sudo service bind9 restart and it's time for the client side.
First transfer the .key and .private files down to the client system via your transport mechanism of choice. Once situated, chmod each file to 0400.
Update Script
The nsupdate tool in the dnsutils package will perform the update. I wrote a simple wrapper script in bash to run the update for me.
Running the do-nsupdate script manually will show whether everything is working correctly.
Last Steps
After a manual run, a quick test with dig will show if the record updated. Note that 216.54.147.14 is the IP for int0x80.com.
The do-nsupdate script can be scheduled to run automatically on the client with cron. I put mine at every 15 minutes as I had some issues with my ISP flapping on addresses in the past.