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

[Ben Dale]

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.

This seems counter-intuitive, but it may also be my current lack of RA clue!

Here you can see the configured and the link-local addresses on the interface:

root at srx100-border# run show interfaces terse vlan.10 
Interface               Admin Link Proto    Local                 Remote
vlan.10                 up    up   inet     172.16.10.252/24
                                   inet6    2001:470:f083:aaaa::1/64
                                            fe80::224:dcff:fe6b:788/64

root at srx100-border# show protocols | display set 
set protocols router-advertisement interface vlan.10 prefix 2001:470:f083:aaaa::/64

Meanwhile, on the client:

lojack:~ bendale$ ifconfig en1
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	inet6 fe80::219:e3ff:fed5:eac6%en1 prefixlen 64 scopeid 0x5 
	inet 172.16.10.23 netmask 0xffffff00 broadcast 172.16.10.255
	inet6 2001:470:f083:aaaa:219:e3ff:fed5:eac6 prefixlen 64 autoconf 
	ether 00:19:e3:d5:ea:c6 
	media: autoselect status: active
	supported media: autoselect

lojack:~ bendale$ netstat -rnf inet6
Routing tables

Internet6:
Destination                             Gateway                         Flags         Netif Expire
default                                 fe80::224:dcff:fe6b:788%en1     UGSc            en1

Can anyone enlighten me?