Supports all the features of the SpeedTouch? Home/Pro but has the addition of DHCP spoofing and a default internal IP address to send all requests for external ports to.
DO NOT USE THE DHCP SPOOFING WITH LINUX, it is very broken!, causes default gateway to go to a random number about once a month and messes with resolv.conf putting in incorrect name servers.
2 pages link to SpeedTouch510: