Hi, The RFC 4443 (Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification) states : (http://tools.ietf.org/html/rfc4443#section-4.2) [. . .] "An Echo Reply SHOULD be sent in response to an Echo Request message sent to an IPv6 multicast or anycast address. In this case, the source address of the reply MUST be a unicast address belonging to the interface on which the Echo Request message was received."
The RFC 4942 (IPv6 Transition/Coexistence Security Considerations) states : (http://tools.ietf.org/html/rfc4942#section-2.1.6) 2.1.6. Anycast Traffic Identification and Security [. . .] "To avoid exposing knowledge about the internal structure of the network, it is recommended that anycast servers now take advantage of the ability to return responses with the anycast address as the source address if possible." Even if it is "must" versus "recommended", It seems contradictory for an anycast address. Please let me know your feedback. Thanks, Francois-Xavier Le Bail -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
