Use of IPv6 link-local and routable IP addresses

(Originally issue PR003: http://lists.oasis-open.org/archives/ws-dd/200902/msg00038.html)

From: Stephan Poehlsen poehlsen@itm.uni-luebeck.de
Sent: Tuesday, February 10, 2009 11:37 PM
To: ws-dd-comment@lists.oasis-open.org
Subject: [ws-dd-comment] WS-Discovery and IPv6 link-local

Hello,

all nodes in an IPv6 network create an link-local IP address for their interface. Then they are able to multicast the router for further information to get/create a routable IP address. So all nodes have a link-local IP address and maybe an additional routable IP address.

So if a Target Service is running on that IPv6 node with these two ip addresses:

• Which IP addresses are used to sent out the UDP datagram? Two Hello messages, each with a different source IP address or only one?
• Which IP addresses are used for xAddrs in the messages? Both?

Maybe a recommendation in the specification is helpful.

Only if a routable IP address is sent out it is possible to use the Target Service from other sub networks. Of course in this case the information from the Hello message must be transfered out of the subnet (maybe with help of Discovery Proxies).

I am trying to use an architecture where I want to forward the Hello messages to a centralized Discovery Proxy, so it is important for me to know how all specification compliant Target Services behave in the above mentioned IPv6 case with a link-local and a routable IP address. For me it is important to get a routable IP address of course.

Stephan
–
Stephan Pöhlsen
University of Lübeck Phone: +49 451 500-5386
Institut of Telematics Fax: +49 451 500-5382
Ratzeburger Allee 160 poehlsen@itm.uni-luebeck.de
D-23538 Lübeck, Germany http://www.itm.uni-luebeck.de