MAC addresses are hop specific when Ethernet packets are forwarded from router to router. All your incoming IP traffic to the WAN interface on your Astaro box will have the sender MAC address of the previous router's interface in the Ethernet packets, which will typically be the router of your ISP.
Cable and ADSL broadband modems are transparent devices that do not insert a MAC address of their own into the Ethernet packets.
MAC addresses are hop specific when Ethernet packets are forwarded from router to router. All your incoming IP traffic to the WAN interface on your Astaro box will have the sender MAC address of the previous router's interface in the Ethernet packets, which will typically be the router of your ISP.
Cable and ADSL broadband modems are transparent devices that do not insert a MAC address of their own into the Ethernet packets.