[j-nsp] RA Discovery and link-local addressing

[Ben Dale]

Thanks Phil and Michael - excellent feedback as always!

On 27/01/2010, at 11:11 PM, Phil Mayers wrote:

> On 27/01/10 12:06, Ben Dale wrote:
>> Hi All,
>> 
>> I don't seem to be able to find a definitive answer to this one
>> either in Juniper's docs, or the very dry RFCs I've been ploughing
>> through but:
>> 
>> I have an SRX (9.6) running a small IPv6 network (a tunnel and a /48
>> provided by HE).  I have statically allocated a /64 from the /48 to a
>> vlan interface and enabled RA.  Host machines (OSX 10.6.2) on that
>> VLAN are discovering addresses from that range correctly, and traffic
>> is being forwarded as expected, but the address they learn for their
>> router is actually the link-local address on the SRX vlan interface,
>> rather than the static address that I would expect.
> 
> That's normal. Since communication with a router is via the local link, the "next hop" of an RA is the link-local address.
> 
> It's perfectly possible (if confusing) for a router to not have an address within the prefix, but still advertise it.
> 
> This puzzles people in Cisco-land with HSRPv6, where the address which is floated is also link-local.
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