nanog mailing list archives
Re: subnet prefix length > 64 breaks IPv6?
From: Glen Kent <glen.kent () gmail com>
Date: Sun, 25 Dec 2011 15:48:00 +0530
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?
From http://www.iana.org/assignments/icmpv6-parameters:
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
Current thread:
- Re: subnet prefix length > 64 breaks IPv6?, (continued)
- Re: subnet prefix length > 64 breaks IPv6? Glen Kent (Dec 24)
- Re: subnet prefix length > 64 breaks IPv6? Jonathan Lassoff (Dec 24)
- Re: subnet prefix length > 64 breaks IPv6? Sven Olaf Kamphuis (Dec 24)
- Re: subnet prefix length > 64 breaks IPv6? Sven Olaf Kamphuis (Dec 24)
- Re: subnet prefix length > 64 breaks IPv6? Glen Kent (Dec 26)
- Re: subnet prefix length > 64 breaks IPv6? Glen Kent (Dec 27)
- Re: subnet prefix length > 64 breaks IPv6? Valdis . Kletnieks (Dec 27)
- Re: subnet prefix length > 64 breaks IPv6? Joel Maslak (Dec 27)
- Re: subnet prefix length > 64 breaks IPv6? Chuck Anderson (Dec 27)
- Re: subnet prefix length > 64 breaks IPv6? Sven Olaf Kamphuis (Dec 24)
- Re: subnet prefix length > 64 breaks IPv6? Glen Kent (Dec 25)
- Re: subnet prefix length > 64 breaks IPv6? sthaug (Dec 25)
- Re: subnet prefix length > 64 breaks IPv6? Ray Soucy (Dec 28)
- Re: subnet prefix length > 64 breaks IPv6? Alexandru Petrescu (Dec 29)
- Re: subnet prefix length > 64 breaks IPv6? sthaug (Dec 28)
- Re: subnet prefix length > 64 breaks IPv6? Glen Kent (Dec 28)
- Re: subnet prefix length > 64 breaks IPv6? sthaug (Dec 28)
- Re: subnet prefix length > 64 breaks IPv6? Ryan Malayter (Dec 28)
- Re: subnet prefix length > 64 breaks IPv6? sthaug (Dec 28)
- Re: subnet prefix length > 64 breaks IPv6? Ray Soucy (Dec 28)