if i want to build a site-to-site VPN
as far as i understand, the "tunnel source" for an virtual tunnel interface is my WAN-interface and the "tunnel destination" is the WAN-interface of my other location. Is this right ?
I saw some configurations on the net where the "tunnel sorce" was loopback 0.
Why would anyone use such a config ?
Is the use of "crypto map" deprecated now ?
Would it be better/smarter to use VTIs now, because they are newer/"more modern" ?
I would be glad if someone could enlighten me on that.