tuntap apparently misbehaving on osx

[Richard Mortier <Richard.Mortier@xxxxxxxxxxxxxxxx>]

i'm porting the dns perf suite over to the new regress/ setup.  with the 
unix-socket build, i don't seem to be able to contact it at all - and netstat 
doesn't show anything listening on 53/UDP as i'd expect.  with unix-direct then 
i see the usual startup but then start seeing many failed writes:

: mort@greyjay:net$; sudo _build/unix-direct/deens.bin 
Password:
Main: startup
[00000] 2011/08/17T22:06:39Z  info                Deens: starting server, port 
53 
Manager: create
opendev: /dev/tap0
Netif: plug tap0
Manager: plug tap0
Manager: plug done, to listener
Manager: init done
Devices: starting provider Unix.Blkif
Main: entering runloop
ARP: who-has 10.0.0.1?
IPv4: dropping proto 2
IPv4: dropping proto 2
IPv4: dropping proto 2
ARP: transmitting probe -> 10.0.0.1
EXN: Failure("tap: partial write")
ARP: updating 10.0.0.1 -> 1e:81:8c:9d:18:0c
EXN: Failure("tap: partial write")
EXN: Failure("tap: partial write")

via "tcpdump -i tap0", pinging 10.0.0.1 from a terminal gets me nothing; 
pinging 10.0.0.255 shows echo requests from 10.0.0.1 -> 10.0.0.255, and 
responses from 0.0.0.0 -> 10.0.0.1 which seems odd.

similar behaviour if i build the tutorial slideset with unix-direct, although 
with unix-socket it works just fine.

so- is this a broken setup on my part, or something that's become broken due to 
eg., new device model?  (or am i just missing something really obvious?!)

-- 
Cheers,

R.

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