Hi Ole, On 10-01-12 12:50 PM, Ole Troan wrote:
hi,a question arose from work I'm doing with the BBF and their CPE requirements document (TR-124/WT-192). an issue has been raised with regards to a requirement about CPE routers automatically offering ULA addresses on the LAN. in the case of multiple CPE routers on a link, the suggestion is the following two requirements: LAN.ADDRESSv6. 3 The device MUST send a Router Solicitation to the LAN, to determine if there are other routers present. MUST LAN.ADDRESSv6. 4 If the device determines other routers are present in the LAN, and that another router is advertising a ULA prefix, the device MUST be configurable to automatically use this information to decide not to advertise its own ULA prefix. MUST
The IPv6 router implementations that I have worked on do not send RSs on their advertising interfaces but I did not find this behavior prohibited by RFC4861. So I think you can get away with doing it and still be compliant.
On the idea itself, I think this is probably overkill. I can see the intent of these requirements (avoid multiple ULA prefixes in the "LAN") but I do not know why this restriction is needed. I cannot see any issues if both the routers advertise different ULAs and hosts configure multiple ULA addresses (one out of each prefix).
Thanks Suresh -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
