Did I setup this correctly? (networking & dns questions)

I've just gotten Leopard server for my office and while I'm an advanced computer user, I'm admittedly noob at servers and advanced networking. So, I just wanted some opinions on if I've setup my server correctly.
We'll be using the server for file sharing, iCal service, wikis, and contacts. Our email and website are hosted by an external host (not our ISP, but a hosting company). So during setup, I entered the server DNS as myservername.private as suggested by the help docs.
How does this work when using the VPN service? I want to be able to connect remotely and access shares as if I was on the local network. So I've enabled the VPN server, and it created a connection file for setting up on client machines, but it's using myservername.private as the server address. Our ISP has given us a range of static public IP's, so do I just map one of those IP's to the server and use that IP as the VPN address?
Hope that made sense... thanks for any help.

As you already have a domainname for your mail and web services so you could ask the one hosting those (they probably host your domainname too) to map a "hostname" of your choice to the public IP you are forwarding ports and protocols to your internal server from. Then you can find your office server using that. You could for example use "office.<your domainname>".
"I'm assuming the DNS info showing up on my router is being put there automatically by our ISP."
Correct. Many ISP have all "their" IPs setup for reverse lookup using some kind of "identifying name" usually with the IP number also "in there".
If you want to use something like "server.<internal domainname>.private" (where the full internal domainname would be "<internal domainname>.private") for the server use only the server's internal IP for DNS on all internal machines or it will pickup the public IP reverse IP name. (Using just "private" as the internal domainname is a bit short.)
This is importatnt: Internal DNS should really be setup correctly before setting up the rest of the server's services. Sometimes you can remedy problems by issuing this command in Terminal:
(check first then follow instr.)
sudo changeip -checkhostname
This is for Tiger Server DNS but it might help explain some things regarding DNS:
http://www.peachpit.com/articles/article.aspx?p=423922&seqNum=3
For a working VPN you need to forward the right ports and protocols:
PPTP : TCP port 1723 and GRE protocol (or sometimes "VPN passthrough" is sufficient but not all routers can forward PPTP correctly).
L2TP : UDP ports 500 and 4500 should be enough (if not also forward UDP 1701) as the server is behind NAT. For Windows XP built-in VPN client compatibility use PPTP.
When you are connected you can't browse the company LAN for services because mDNS/Bonjour isn't forwarded through the VPN. You need to know the IP or machine name (if internal DNS is correctly setup and depending on if using static IPs for machines beside the server or not).
This might explain some about VPN:
http://www.maclive.net/sid/132
When connected to the VPN you should have the server internal IP for DNS (you'll get it automatically through the server VPN settings) so you can find internal only services using names as when you're at the office.

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