Setting up own domain and mailserver

[RL]

On Sun, 13 Feb 2005 13:24:36 +1030, Paul A. Hoadley
<paulh at logicsquad.net> wrote:
> On Sat, Feb 12, 2005 at 07:52:08PM -0500, RL wrote:
> 
> > 1. I have adelphia cable internet.  I would like to get a dyndns or
> > no-ip.com account to have a static IP for my new godaddy domain.
> 
> I assume both of those services are dynamic DNS providers, and I'll
> assume your cable provider gives you a dynamic IP address.  Dynamic
> DNS providers don't provide you with a static IP, but rather
> nameservice for your domain.  The provider will nominate some subset
> of their nameservers for you to register (with the registrar that sold
> you the domain name) as providing DNS for your new domain.  The idea
> is that whenever your IP address changes, you contact the dynamic DNS
> provider (in some provider-specific way---e.g., a web form, a local
> script) to update your A record.
> 
> > Simple enough.  However, I would like to also do my own DNS to learn
> > more about it.  Will I be able to do this if I set my nameserver on
> > godaddy to my box's dyndns address?
> 
> Almost certainly not, for two reasons.  You need a static IP address
> to lodge with your registrar.  (I guess it would be _possible_ to
> manually update the address with your registrar every time it changes,
> but quite impractical.)  Further, you need to provide at least two
> nameservers for your domain.  Again, it is _possible_ that you could
> personally provide one, and use a DNS provider as a secondary.
> 
> > 2.  What about reverse DNS?  Could I possibly do that on my box?
> 
> Not unless you solve all of the problems above, and then discuss the
> issue with your ISP---since they own the IP address, they run the
> corresponding part of the in-addr.arpa zone, and the specific PTR
> record you will require.
> 
> > 3. I would also like to run my own mailserver for that domain (again
> > to learn).  Would I be able to do this and send receive email
> > from/to name at mynewdomain.com?
> 
> This you'll be able to do.  You need to add an MX record to your zone
> file at the dynamic DNS provider.  You would want mail sent to the
> host named in the A record.
> 
> > I know most ISPs block port 25 and no-ip.com has a pay service
> > called mail reflector that can get around this.  Is this necessary?
> 
> If _your_ ISP blocks port 25, then you'll have to do _something_ to
> get around that, but I don't know if that particular service is the
> right solution.
> 
> > Why couldn't I just set up sendmail to use a port other than 25 like
> > 8080?
> 
> There's certainly nothing _intrinsically_ special about port 25.
> However, it's the port that everyone's agreed to send mail to.  If
> your sendmail was listening on port 8080, how would my sendmail know?
> 
> --
> Paul.
> 
> w  http://logicsquad.net/
> h  http://paul.hoadley.name/
> 
> 
> 


Yeah and crappy Adelphia doesn't offer static IPs without charging way
way too much.  At least I should be able to set up my own mail.