My firewall-oriented roles need to use different network info when executed 
on different machines, depending on which interface is the external one and 
which is the internal one. Thus I need to be able to set e.g.:

ext_if: eth0
int_if: eth1

and from here, ip network information to be taken from ansible_eth0 for the 
external interface and from ansible_eth1 for the internal. And if on 
another machine they are different, e.g. eth1 is the external and eth2 is 
the internal, I would only need to change the above to

ext_if: eth1
int_if: eth2

In shell syntax that would be like ansible_${ext_if} / ansible_${int_if} ...

How would you guys do that with ansible?

Any input much appreciated, thanks in advance!

-Yassen

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