I have been tasked with providing Internet to a number of clients on our internal LAN, without affecting our own Internet bandwidth.
I would propose using a Cisco 1800 with the IOS Firewall Feature set to provide network edge security and my immediate thought is to order multiple ADSL lines (as needed) and connect them to a free interface on the Firewall (via a switch). This interface will use sub-interfaces to connect to the different ADSL connections, and by using PBR and customer source addressing, route traffic over the ADSL lines.
I have attached a diagram to represent this. Arguably I could mix and match which networks go over which ADSL lines, i.e. policy route a few customers over 1 ADSL and observe bottlenecks, I could then order in additional ADSL lines and policy route new customers over them.
Does this sound like a viable solution ?
Yes, that is what I recommend. You can configure PBR as you mentioned.
It is not even said that ADSL connections are always PPP. Some ISP do use "bridged IP".
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