[OpenAFS] NAT issues.

[Jim Rees]

Sigh.  Groan.  Didn't we just discuss this last week for the hundredth time?

The consensus was that it's a bad idea to allow ordinary users to pound on
the servers that way.  I did put code in cvs head that will check up and
down servers every 30 seconds, but right now there is no convenient way to
turn it on.

Doing this with ttl=1 is an intriguing idea, but I think it belongs in an
external application, like natkeep, not in OpenAFS.  And it would be hard to
implement, requiring systype dependent code.  And the ultimate fix is tcp
but that's a big job and a long way off.