[ubuntu-uk] Setting up mailserver

[Martin Meredith]

On Sun, Dec 28, 2008 at 10:38:22AM +0000, Sean Miller wrote:
> On Sun, Dec 28, 2008 at 10:31 AM, Martin Meredith <mez at ubuntu.com> wrote:
> > Dyndns etc provide services that allow you to setup a domain name that will
> > change it's DNS when contacted by you.
> >
> > Put simply, a dynamic DNS service needs to be told every time your IP address
> > changes. When this happens, it updates the record for your domain name to point
> > to the new address. Generally, these use a low TTL (time to live) so that DNS
> > servers at, for example, your ISP, will query their DNS servers (with the
> > up-to-date record for your IP address) on a regular basis, rather than caching
> > it (which is why you generally find when you make DNS changes on a "control
> > panel" style site, it says that you may have to wait up to 48 hours - this is
> > for the TTL to expire, so the DNS server checks against the server holding the
> > record, rather than their internal cache)
> 
> I think we have two completely different things here.
> 
> One is the concept of DNS propogation, but the other is what DynDNS
> does which is forward traffic to a given IP.

DynDNS is a DNS solution, NOT an IP forwarding solution. It does not forward 
traffic to an IP, it merely sets up a domain name which resolves to the IP 
address that is given to it, with a low TTL, so that when it changes, the 
propogation goes through quickly.
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