Request external certificates for DMZ

Hi,

I have a lync server front-end instaled. inside the organization woks fine. Now, I need to comunicate outside the organization and I have create a DMZ server with 2 NIC's. One Internal and other external.

For helping me on the instalation I use the 'Microsoft Lync Server 2013 Step By Step for Anyone eBook'.

In the certificate request, 'Sip Domain setting on Subjet Alternative Names', apear the 'domain. local' and the 'domain.com'. Should I check bouth of them?

Do I neet to do the 'route' for the network?

Thanks!