>>>>> In <87d56u22id.fsf@roddy.4407.kankyo-u.ac.jp> 
>>>>>	NAKAJI Hiroyuki <nakaji@jp.freebsd.org> wrote:

>    -----------+----------- main stream (connected to the Internet)
>               |tlp0        OCN registered /29 network
>             +-+-+  \
>             |RaQ|  NAT
>             +-+-+  /
>               |tlp1
>      ---+-----+----------- private subnet (testing network, 192.168.1.0/24)
>       +-+-+
>       |P C|
>       +-+-+

The NIC on the PC is RTL8139-based. And network hangup of the PC
occurs even if I leave it with no operation.

## I had to doubt about Windows itself at first ...

> > > My assumption is following. What is the possibility?
> > >
> > > 1. RaQ 2 is too slow to handle large traffic.
> > > 2. The HUB I'm using on private subnet is too weak.
> > > 3. tlp(4) has some problem.
> > > 4. other
> > >
> > > If 3 is the true reason, what shoud I do to debug or improve it? Do I have
> > > to show more information about my RaQ2?

The most probability seems #4. I changed the NIC's driver to that
included in Windows itself and I also changed the settings to default,
and the performance seems stable.

Good news. NetBSD/cobalt is not bad. Thanks.
-- 
NAKAJI Hiroyuki