Hi,

I've several Vigor 2860 routers dotted around different sites in my business and I'd like to enable segregated guest WiFi access.

Is it possible with this router to enable a second SSID (WLAN) on a segregated VLAN with DHCP providing access to the internet and no access to our internal business LAN?

Any advice is much appreciated.

Yes, use the VLANs and set up a new network just for Wi-Fi - If you want them segregated then don't tick the inter-Vlan routing option.