> Can a single global address (say 2222::1111) be configured on multiple > interfaces of a single ip6 node.
Yes, it can. There are a few ways to accomplish this. If all the interfaces are on the same lan, then you could have a "primary" and a "backup" interface. If the interfaces are on different lans, you can run a dynamic routing protocol and advertise the address as being reachable through each physical interface on a node. In this case, the address isn't really configured on the multiple interfaces per-se (you instead have a "virtual" interface which is assigned the IP address), but the result is any interface on the node may be used. There are other methods which may be used as well. > If so is there any specific purpose for doing that ?? Redundancy. If one interface goes down, traffic will automatically switch to the another interface without disrupting existing connections. > What about link-local address, how would it be used, if single link local > address is configured on multiple interface of a same node. I'm not sure it is particularly useful. Link-local addresses are really intended to be used for bootstraping, configuration discovery, route table maintenance, and the like. Most, if not all, of these protocols work on a per-interface basis. I suppose it could allow an interface to act as a "hot standby" for another interface, automatically switching over if the primary interface fails. But this would only work if the interfaces are on the same physical lan. If they are on different lans, then the two interfaces are in different link-local scope zones and are treated as unique addresses. Roy -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
