connection startup issues with recent DragonFly.

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

    A little while back someone, I forgot who, mentioned that after
    rebooting the first ssh connection to a machine took several
    seconds longer to get going, but all later ssh connections were
    made quickly.

    At the time I thought it might be sshd generating a host key or
    something like that.  It happens to me too every time I reboot a
    test box.

    But today, after upgrading my workstation to HEAD, I noticed that
    the delay seems to occur to machines that are already up and running.
    When I come in in the morning and click on my 'leaf' button, it takes
    a few seconds before the connection is made.  But if I click it again,
    another connection is made immediately.

    Ahhh... sounds like an ARP issue!

    And indeed, if I arp -d the ARP entry to leaf on my workstation, then
    ssh again, the 3 seconds delay occurs again.  And after that, no delay.

    Jeff, I think the arp code is dropping the packet(s) triggering the
    ARP event or otherwise doing something with it so it does not reach the
    target machine.  Could you take a look?

					-Matt
					Matthew Dillon 
					<dillon@xxxxxxxxxxxxx>