I think that the PI /24 block should be assigned only to UDP related services as RFC suggests, however, I have yet to see the successful implementation of TCP data, state... replication in case one router withdraws BGP announcement of the /24 prefix. IPv4 anycast is a perfect way to distribute load and hopefully with lowest latency (not always true) for the following UDP related services: -syslog -dns -ddos mitigation The PI /24 anycast block should be assigned only when the applicant can demonstrate: at least 5 physically disperse locations (verification done by traceroute and checking the hop before the last hop in the traceroute). Traceroute's can be performed from open traceroute gateways (over the web etc - there are hundreds) or public ISP BGP route servers. to manage the server you will need a non anycast address(es), however, customers may keep this info secret if they do not want it to be public.... all anycast nodes must speak BGP to the upstream and in case the server goes down, the BGP router withdraws the BGP anycast /24 route Ps. If Ripe will allow anycast /24 PI allocation for syslog and ddos, and other UDP based services, then expect all free /24 blocks taken in a year or less for sure ;) My $0.02 cents... Greg http://www.LinuxAdmin.org