On Friday 31 July 2009 10:15:56 markham roan wrote:

> A packet capture revealed a number of anomalies.  Once the server starts
> trying to join the domain, we get all sorts of TCP transmission errors,
> retries, duplicate ACKs etc.  In some cases, the public side of the
> firewall will send an ICMP host-unreachable message for a host which is
> clearly being BINAT.
> I've tinkered with net.inet.ip.intr_queue_maxlen, but it doesn't seem to
> help.  net.inet.ip.intr_queue_drops isn't increasing at a noticeable rate,
> anyway.
> Does anyone have any thoughts and/or advice on where I can go from here?

No experience with the case at hand, but I do see that Vista started to use 
IGMP protocol even when there's no obvious need to do so. Given that "allow 
all" does in fact only allow a handful of IP protocols, excluding IGMP, you 
may want to investigate if you're not silently blocking (or not translating) 
one of the more obscure IP protocols.
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