[isf-wifidog] Dynamic DNS : The ultimate solution

Mer 8 Mar 13:05:19 EST 2006

Hey François,

That'll work for HTTP for sure - or whatever ports you have Apache answering
- it would definately let webcams be easily accessible remotely (with the
appropriate port-forward on the router). But other services (say PCAnywhere
or something like that) would still rely on DNS to map a domain name to an
ip address.

A further elaboration of Mina's idea to utilize your existing DDNS service
would be to implement a trigger on the table that captures the ip address of
the heartbeat and, on change, call a perl script that implements the
Net::DNS perl module :

http://search.cpan.org/~olaf/Net-DNS-0.57/lib/Net/DNS.pm

The Net::DNS library allows you to craft the appropriate DNS request to
add/update a dynamic host. Please excuse my linux ignorance, but I would
assume you'd want to spawn a new thread/process so your perl ddns-updating
script doesn't hold up the database update that caused the trigger while it
is updating a remote dns server - I know there is some complication with
multithreading and linux but I'm totally novice when it comes to linux.

Of course this is all just theoretical but, I'd be willing and interested in
writing the perl script that updates DDNS if the ISF folks thought it was a
worthy venture. Regardless, it's fun to talk about it.

Rein

On 3/8/06, François Proulx <fproulx at edito.qc.ca> wrote:
>
> Here is a potential solution for managing dynamic DNS entierely from the
> Wifidog back-end.
> Create an Apache name-based VirtualHost with the ServerAlias parameter set
> to something like
> ServerAlias *.hotspots.ilesansfil.org
>
> See Apache doc here :
> http://httpd.apache.org/docs/1.3/mod/core.html#serveralias
>
> So, there would be a proxy PHP script that would be called and look if the
> first part of the URL matches the name of a hotspot in the database, maybe
> even do soundex or metaphone searches then redirect to the right portal page
> .... So that's pretty simple to do and we can specify the alias in the
> Wifidog admin back-end
>
>
> On 8-Mar-2006, at 11:19 , Max Horváth wrote:
>
> Well, the question is - can you provide a tutorial on how to run our own
> DDNS server?
> Cheers, Max!
>
> Am 08.03.2006 um 16:24 schrieb Mina Naguib:
>
>
> On 8-Mar-06, at 8:41 AM, Rein Petersen wrote:
>
> Hi Max, Hi Benjamin,
>
> Benjamin's idea of using a client to update an existing dynamic dns
> service is probably the easiest. You could delegate a subdomain of
> ilesansfil.org (how about "venues.ilesansfil.org") to a remote dnydns
> service so your existing dns is not affected, then have a trigger on the db
> that uses the client to update the remote dyndns server on change of an ip
> address.
>
>
> The DNS server handling ilesansfil.org already supports dynamic DNS entry
> updating ;-) No need for anything fancy to be done.
>
>
> I had imagined something a little more elaborate - delegating a subdomain
> to your auth server and running a perl sockets service that answers only
> host lookups on port 53. Bothering with the entire BIND DNS spec would be
> unecessary (don't need reverse or MX queries). DNS speaks binary on the wire
> so it is still a little elaborate but not impossible (I've worked on a
> resolver for a mail server called Lumisoft Mail).
>
>
> Entirely doable (done it before as well), but a bit overkill :-)
>
>
> I think Benjamin's plan may be easier to implement.
>
> Rein
>
> On 3/8/06, Benjamin Crulli <lostocean at gmail.com> wrote:
> >
> > These are the three dyndns GNU/Linux softwares i know about.
> > <a href="http://sourceforge.net/project/showfiles.php?group_id=65917">updatedd</a>
> >
> > <a href="http://www.funtaff.com/software/addns.pl">Addns.pl</a>
> > <a href="http://ipcheck.sourceforge.net/ ">ipcheck.py</a>
> >
> > On 3/8/06, Max Horváth <max.horvath at maxspot.de> wrote:
> > > This feature would be nice ... but I think we won't be able to do it
> > by just
> > > extending the auth server.
> > >
> > > In fact I still don't know which software exists for linux to provide
> > a
> > > DynDNS service :( ...
> > >
> > > Did you already do some research?
> > >
> > > Cheers, Max!
> > >
> > >
> > > Am 08.03.2006 um 05:11 schrieb Rein Petersen:
> > >
> > > Hi All,
> > >
> > >  Considering that Wifidog clients heartbeat frequently to the auth
> > server, I
> > > was wondering if anyone had considered rolling Dynamic DNS service
> > into
> > > Wifidog auth server.
> > >
> > >  Then you could resolve dynamic ip addresses to names like
> > > boodhabar.ilesansfil.org
> > >
> > >  This might be helpful for venues that want to run their own services
> > or
> > > have a webcam installed.
> > >
> > >  Just a crazy idea but I think it would be cool.
> > >
> > >  Rein
> > >
> > > _______________________________________________
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> > >
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> > >
> > >
> > >
> >
> >
> > --
> > Ben Crulli
> > _______________________________________________
> > WiFiDog mailing list
> > WiFiDog at listes.ilesansfil.org
> > http://listes.ilesansfil.org/cgi-bin/mailman/listinfo/wifidog
> >
>
>
>
> --
> Rein Petersen MCP MCP+I MCSE MCDBA MCAD
> Software Engineer_______________________________________________
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>
>
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>
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>
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>

--
Rein Petersen MCP MCP+I MCSE MCDBA MCAD
Software Engineer
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