A feature invaluable to any ISP would be DHCP Snooping with option 82 as found in Cisco and AliedTelesyn products : http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_guide_chapter09186a0080435791.html http://www.alliedtelesis.com/datasheets/dhcp-snooping-opt82_sd_a.pdf#sea...