WAN IP inaccessible from within LAN (MacMini Server)

Hi!
I'm having a bit of a networking problem that's exhausted my (pretty basic) understanding of DNS and basic networking. It's the kind of thing that i imagine has a quick fix, just one that in my fairly limited experience i've not yet come across. Hopefully someone on here will be able to help.
*Office setup:*
Mac Mini server running OS X 10.6.4 (at 192.168.2.250)
~6 client iMacs, all running OS X 10.6.4
DrayTek Vigor 2820 router connect to the web with a static IP (at 192.168.2.1)
Problem:
Our WAN IP address appears inaccessible from within the LAN.
Normally this doesn't cause any problems but increasingly, as we start to make better use of features such as the iCal and Address Book servers, we are encountering stags.
Take iCal for example. The client machines connect to iCal server via the internal server domain (macserver.private) - this works great. To access iCal server from outside the office (eg. on iPhone) we connect via a subdomain of our company domain ('ical.ourcompnay.com') which points to our office WAN IP. (The nameservers for 'ourcompany.com' are on our webserver, not in the office.) This also works great, until you bring the iPhone or laptop into the office, at which point the WAN IP, pointed to by 'ical.ourcompnay.com', is inaccessible.
By inaccessible i mean that when you try to browse to the IP in Safari, a page simply never loads. And when you 'traceroute' it, you simply get no return.
Aim:
The aim is to be able to use the WAN IP inside the LAN exactly as we can from outside the office. Or to discover some workaround that delivers comparable behavior.
*Other info:*
The client machines' network preference are all set with DNS serves of both 192.168.2.250 (server) and 192.168.2.1 (router). For some reason (that i'm not able to explain) clients are unable to access the internet unless the router's IP is specified in addition to the server's, despite the server specifying the router as the 'forwarder address'.
If there's any essential info that i've missed out then please let me know and i'll fill any gaps straight away.
Thanks in advance for any help.

Camelot - thanks for your reply!
Note, there may be some setting in the router that controls/allows this
I thought that there may be something in the router configuration that would solve my problem but have so far had no success. The most useful looking thing I can find is called 'Static route'. Setting up a static route requires just 4 parameters: Destination IP Address, Subnet Mask, Gateway IP Address, Network Interface (ie. WAN or LAN).
My understanding of this feature is that it is intended for facilitating networks with multiple routers so i'm not sure that it's going to help me. Unfortunately, as much as i Google i don't seem to be able to fully get my head around subnet masks so it's hard for me to know if a static route will ever be able to help me. Any thoughts?
The alternative is to configure your own internal DNS server as being authoritative for ourcompany.com
I initially thought that this would solve my problem too but i'm now not so sure. The client iMacs all had to be manually configured to use the server (192.168.2.250) as their DNS server. By default devices connected to the network inherit the router's DNS servers (external to the LAN). So surely even if the the server's DNS server was authoritative for 'ourcompany.com', this wouldn't actually get queried by 'temporary' network members (iPhones, laptops etc.)?
you have set the server to allow localnets to resolve, right?
I think so. In the DNS server settings (in Server Admin) 'localnets' is listed under 'Accept recursive queries from the following networks:'. 'localhost' is also listed.
nslookup www.apple.com 8.8.8.8
This works fine, both from the server and from clients.
I too am a little worried that both server and router must be listed for the clients' DNS servers. I'm no expert (as you can tell!) but when setting up the network i wasn't particularly satisfied by this, it felt like a bit of bodge.
Thanks for your help so far.

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