Using internal services via external IP address

I'm having an issue with my ADSL router and port forwarding. I
currently have an internal server running a few services (let's call
this box SERVER1). I also have an ADSL router, with a static IP
address and port fowarding configured to allow the services on SERVER1
to be accessed externally via SERVER1.MYDOMAIN.COM.

This all works perfectly when I'm outside my local network, however
when I'm on my local network and I try to access SERVER1 via
SERVER1.MYDOMAIN.COM, my router is not forwarding the connection on to
SERVER1 and is instead trying to serve the connection itself.

A traceroute example looks like this

~$ traceroute SERVER1.MYDOMAIN.COM
traceroute to SERVER1.MYDOMAIN.COM (XXX.XXX.XXX.XXX), 64 hops max, 40
byte packets
1 YYY.YYY.YYY.YYY (YYY.YYY.YYY.YYY) 1.748 ms 1.202 ms 1.206 ms
2 YYY.YYY.YYY.YYY (YYY.YYY.YYY.YYY) 1.245 ms 1.374 ms 1.232 ms

where YYY.YYY.YYY.YYY is the IP address of my router.

Is there a way to force my router to apply the port forwarding rules
when the request comes from the internal network? I realise that I
could resolve this by setting up a local DNS server, but would much
prefer to sort it out via the router if possible.

Any help would be much appreciated.

Thanks
Scott

.

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