Hi Ray,
prefixes on the same link. Choosing to make use of a 120-bit prefix (for example) will do nothing to protect against a rogue RA announcing its own 64-bit prefix with the A flag set.
I could not find any "A flag" in the RA. Am i missing something?
Registry: RA Option Bit Description Reference ------------- --------------------------------------- --------- 0 M - Managed Address Configuration Flag [RFC2461] 1 O - Other Configuration Flag [RFC2461] 2 H - Mobile IPv6 Home Agent Flag [RFC3775] 3 Prf - Router Selection Preferences [RFC4191] 4 Prf - Router Selection Preferences [RFC4191] 5 P - Neighbor Discovery Proxy Flag [RFC4389] 6-53 R - Reserved; Available for assignment [RFC5175] 54-55 Private Experimentation [RFC5175] Glen