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 ???
L2TPv3, QinQ etc. are used to extend the SAME vlan to both sites ie. a machine in one site is in the same vlan as the other site. So a broacast from one machine would be sent to all other machines whether they are in the same site or across the leased lines.
This doesn't sound as though this is what you need. If you just wanted communication between your vlans and you want to limit that communication then by far the easiest way as you say in your last sentence is to use acl's on the interfaces that connect the sites to each other.
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