Headquarter and several Branch office.
Each site has some VLANs (overall the same: Legacy, Printers, VoIP, Management, etc.)
The connection between sites are over leased lines (Layer-3 Routing), but I can not access to this Routers.
Some suggestion on the best way to connect the VLANs of each site, limiting the connection only inner the same-service VLAN (VoIP only with VoIP, Legacy only with Legacy, etc.) - intra-VLAN connection is performed and controlled by a FireWall.
Someone suggest me to use L2tp, some other speaks about VPN, or QinQ, or ???
And what about a "simple" routing with ACL?