OK, so then lets go back to the question posed in the thread. The current spec says that one should never use an anycast address as a source address under any circumstances. That clearly flies in the face of present practice, isn't responsiv to the set of concerns you raised about anycast in general, and can be mitigated if anycast is use for rendesvous. The suggestion was made that under a defined set of circumstances (single message each way exchange, rendezvous, perhaps some others) and with a defined set of procedures it would be OK to use it as a source address. Those procedures need to spell out the whys and wherefores.

Would you be willing to see the 100% ban removed from the draft standard and substitute text to the effect of that above included, with follow-up work in grow-or-wherever to spell out those procedures?



On Apr 6, 2005, at 8:19 PM, Mark Andrews wrote:



On Apr 6, 2005, at 6:36 PM, Mark Andrews wrote:

        Getting back to unicast initiated sessions I would still
        like to see some mechanism (as low in the stack as possible)
        which would allow long running session to survive routing
        changes.

You're speaking in this thread. Did you take a look at the proposal
that Eric Nordmark, I, and the grow folks have discussed about a
care-of-address that would give a long term fixed address to the server
in question? Answering that question is where we started out.

care-of-address would be overkill for somethings and quite a reasonable solution for others. If it could be made selectable on a per/socket basis (I havn't looked at how implemetation do this at present) I suspect this will meet most of what would be required.

        In other words we would not want to do this for DNS/UDP but
        for DNS/TCP it would be acceptable even though it would only
        be really required for long running AXFR's (multi-megabyte).

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