Scenario:
My company (Site A) needs to allow a partner company (Site B) access to Site A ERP application for users in Site B. Site A and B are separate companies and not in the same Active Directory forests, they have different ISP's and subnets etc. Both companies have sonicwalls and static IP's. Would a route based VPN with a static route to the destination ERP subnet in Site A be the way to go or would a site-site VPN?