NSIS Mobility Reality Check

1
NSIS Mobility Reality Check

• Drafts talk about moving extensive state in the
  network between old and new routing path.
• Excuse me but what state are we talking about
  here?
• Most today routers dont maintain per node state
  or per flow state on intermediate routers.
• Primarily just on the access (first hop) router
  and firewalls/NAT boxes at border routers.
• Even future designs for stateful QoS dont
  maintain per flow or per node state on most
  network nodes.
• RMD (draft-bader-rmd-qos-model-00.txt) specifies
  per Diffsrv queue state in interior nodes.

2
Some Possible Mobility-Related Problems

• Mobile signals a firewall on access router for
  service access.
• Mobile signals a new border firewall/NAT box upon
  routing change.
• But this isnt any different than for a fixed
  host.
• Multi-interface mobile without Mobile IP hands
  over to new wireless medium, needs to signal
  middleboxes.

but these arent problems now and probably wont
be for quite a while
3
Keep in mind

• The IETF works best on well defined problems
  which vendors and operators are motivated to
  solve.
• Without deployment or product pressure, research
  problems are difficult to impossible to come to
  consensus on.