[EMAIL PROTECTED] disait : > Search the archives, Comcast and other cable/DSL providers use the > 10/8 for their infrastructure. The Internet itself doesn't need to be > Internet routable. Only the edges need to be routable. It is common > practice to use RFC1918 address space inside the network. Companies > like Sprint and Verio use 'real' IPs but don't announce them to their > peers on customer edge routes.
Are you sure about Sprint ? I was told that Sprint DOES announce edge blocks to peers/custom (For URPF i guess) but blackholes this block at the edge. Thus you can still traceroute the IP up to Sprint edge, but cannot get into Sprint network. This is a hot issue for Opentransit since we are considering not announcing some infrastructure blocks. I think that Sprint way is rather smart : . It prevent/mitigate infrastructure DDOS . It keeps working with URPF enable peers. Vincent, Opentransit - France Telecom