One more apparent headache: a mobile node running mobile IP for IPv6 (MIPv6) will often be in 2 different domains simultaneously. It's home domain (where it continues to have a Home Address and the domain that it is currently visiting). How does one handle site-locals in this case?
Consider the comparatively easy configuration where MIP is using global addresses for everything, but both sites happen to use SLs for some of their own internal stuff. When the MN needs to send an IP packet to a particular address, and it is a SL address, where does it send it? should it: - tunnel it back through the Home Agent? (I.e., assume the address is for a node at its home site) - send the packet locally (i.e, assume the packet is for a node on the local site) Problem is, neither answer is right in all cases, and it seems like there are no easy rules for making the right thing happen in all cases. This leads me to conclude that using both SLs and MIP together will lead to scenarios where communication will fail, when the typical user will expect them to succeed. This does not seem good like a good situation. Note that a fundamental assumption (at least in my mind) is that when one uses MIPv6, everything should "just work". SLs seem to introduce some problems here. Note that the situation is a whole lot messier still, if the MN's Home Address is SL, or if the HAs it is using are SL. But one can at least say "don't do that". But it still leaves the above issue unresolved. Thomas -------------------------------------------------------------------- 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] --------------------------------------------------------------------
