how a name DNS can have several @ IP in different lan?

[Guillaume]

Hi, 

I have a delegation from my domain name. I want to
create new services in my domain : 
myservice.mydomain.com.

example for one of the 3 services:
In Internet, the good ip @ is: internet:
myservice.mydomaine.com -> 217.167.31.20
In my lan, there is a different @: private lan1:
myservice.mydomaine.com -> 10.241.14.15
In other privale lan, the good adress is: private
lan2: myservice.mydomaine.com -> 10.232.0.250

There is a NAT from lan 1 to lan 2 
@lan2(10.232.0.250) -> @lan1(10.241.14.15)

All sercices in mydomaine.com are used by internet. 
only 3 services in mydomaine.com are used in internet,
lan1 and lan2
For these services, it is necessary to have exacly the
same name, and the same domaine.

If I configure my DNS with 217.167.31.20, it is
necessary to create 2 others DNS
and for each DNS syncronise manually all @ for
services in mydomaine.com.

I don't know a better architecture ? 
do you have some information, for a beginner in DNS.

Regards, 
Guillaume Moulard 



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