I thought someone had to respond to router solicitations for stateless autoconfig of global scope addresses to happen. On Linux you just don't run the radvd. On Cisco I think it's something like "ipv6 nd suppress-ra" in the interface config. Does that fail to prevent stateless autoconfig? Or is there a problem with the operation of DHCPv6 if router advertisements aren't happening from the router?
The "ipv6 nd suppress-ra" config will only suppress unsolicited RA, it will still respond to RA solicitations. Load it up in Wireshark and you'll see. A lot of host implementations of IPv6 seem to enable SLAAC as soon as they see any 64-bit prefix regardless of what flags are set. Making assumptions about IPv6 has proven to be unwise in my experience. So far, the only thing that I've seen that is close to working is to configure the router to not advertise the 64-bit prefix using "ipv6 nd prefix <prefix> no-advertise", but at that point it seems easier to just go with a 80-bit prefix and remove any doubt. -- Ray Soucy Communications Specialist +1 (207) 561-3526 Communications and Network Services University of Maine System http://www.maine.edu/