Table of Contents
The Synchronet Dynamic DNS module is used in combination with the Synchronet Dynamic Domain Name System (DynDNS) Service hosted on Vertrauen to provide free
.synchro.net hostnames to Synchronet sysops.
If you'd like a
synchro.net hostname, I offer a free, very easy-to-use
dynamic hostname service exclusively for Synchronet sysops. Your
hostname will always point to your current IP address, as long as your BBS
is running. Using this service requires Synchronet v3.10 or later.
1. If you don't already have the
exec/dyndns.js file, download the file into your Synchronet
2. If you haven't already, create a QWK networking account on Vertrauen using your BBS's QWK-ID for the username (see this howto for more details).
Note: You do not have to actually join DOVE-Net to get a
synchro.net hostname, if you do not wish.
3. If you don't already have one, setup a timed event (in SCFG->External Programs->Timed Events) to run the
?dyndns yourpass periodically, where yourpass is the
password you used when you created your QWK networking account on
Vertrauen. “DYNDNS” is the suggested internal code to use for this event.
If you have a frequently changing IP address (and Synchronet v3.11 or later) set “Always Run After Init/Re-init” to “Yes”. With this option set to “Yes”, frequent timed updates should not be necessary.
If you have a static IP address, one run (update) per month should be sufficient.
Make sure that “Enabled” is set to “Yes”.
4. After saving your changes in SCFG, and verifying that the Terminal Server
has recycled, check the event log window or console output to verify that
the “DYNDNS” event has executed. You can force the event to execute with
the (Win32) SBBSCTRL:BBS->Force Timed Event menu option, or by “touching”
(creating or modifying) the file
5. Attempt to ping or connect to services at
your-id is your BBS's QWK-ID. It may take a few minutes for a new hostname
to become active or for an existing hostname to resolve to a newly changed
You're ready to go with your new
If you choose to include any
dyndns.js command-line options, they must follow your password (and a space) on the configured command-line.
DNS MX (mail exchange) resource records are used to designate a specific
hostname as the “mail exchange” (receiving SMTP server) for a specific
hostname. If there is no MX record, then the hostname itself is assumed to
perform the role of “mail exchange”. Some receiving SMTP servers now require
that the *sending* SMTP server correspond to the MX record of the “from”
hostname. If you want to specify an MX record for your hostname, you can do
so by adding
-mx (optionally followed by a hostname) to your
command-line (after the password). If no hostname is specified, then an MX
record pointing back to your hostname will be created. Example:
?dyndns password -mx mail.someother.org
If you want to update a hostname that is different than your BBS's QWK-ID,
ou can specify that hostname (QWK-ID) on the
(after the password) by using the
-hn option followed by the hostname
to use (not including “.synchro.net”). There must be a corresponding QWKnet
account on Vertrauen for the specified hostname and password.
If you have a public IPv6 address, you may create/update a
AAAA record along with your IPv4
A record by including the
-ip6 option followed by a space and your current public IPv6 address.
Vertrauen cannot at this time automatically detect your public IPv6 address, so if your
IPv6 address changes, you will need to change the command-line accordingly.
If for some reason you want to specify a different IPv4 address than the one that your BBS will be using to connect with Vertrauen, you can include that IP address on the “?dyndns” command-line (after the password). This is an advanced feature that you should not need to use under normal conditions, even if your BBS is behind a firewall/router using network address translation (NAT) - the DynDNS server running on Vertrauen uses your correct public IP address by default.
Due to command-line length limits (63 characters), you may want to move one or more of the longer command-line options to the
[dyndns] section of your
The following options/keys are supported:
| ||MX||Mail Exchange record (hostname)|
| ||A||IP version 4 address (e.g. 126.96.36.199)|
| ||AAAA||IP version 6 address (e.g. 2607:f8b0:4007:801::200e)|
| ||TXT||Text (default: BBS name)|
| ||LOC||Location coordinates (see http://dnsloc.net/ for details)|
| ||CNAME|| When set to