On Fri, 24 Apr 1998, Karl Denninger wrote:
Well, there is a simple knob for this:
If the Knob is turned "ON", then any packet from a source address which is not routed to the interface it came in on is dropped.
This works for static, dynamic, and all other kinds of routing. It will solve the problem and is trivial to implement - if any of the vendors care.
It doesn't work for asymmetric routing as you describe it above. If you modify your criteria to be that there are no valid routes out that interface, you would only break transient routing conditions, but depending on how the router stores routes it may not be possible (or desirable due to memory requirements) to implement. John Tamplin Traveller Information Services jat@Traveller.COM 2104 West Ferry Way 205/883-4233x7007 Huntsville, AL 35801