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Date: Sat, 5 Jul 2003 13:43:39 -0400 (EDT)
From: Robert Watson <rwatson@freebsd.org>
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To: Lukas Ertl <l.ertl@univie.ac.at>
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cc: sam@freebsd.org
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Subject: Re: Experiences with ath(4)
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On Sat, 5 Jul 2003, Lukas Ertl wrote:

> > The ADSL router (a Speedtouch 510) does NAT. Everything seems to work
> > fine, but after some time, all connections from the WLAN client to the
> > outside world have died. I can connect to the other hosts in the LAN just
> > fine, though, and there are no further messages in the log files.
> > The quickest way to make it work again, is pulling the card out and plug
> > it back it. Any ideas?
> 
> Ok, I've investigated this further. The strange thing is: whenever the
> connections to the outside drop, I can ping and connect to any host in
> my LAN (10.0.0.0/24), but I _cannot_ ping 10.0.0.138 from the WLAN
> client, which is the inside interface of the ADSL router and thus the
> default route. I can't explain why. "ifconfig ath0 down && ifconfig ath0
> up"  solves this lock-up. Could this be a driver bug? 

Just to check: you're not using multiple NATs in this configuration,
right?  I've noticed terrible TCP and general networking interactions when
I layer a Linksys wireless router NAT behind a SpeedStream DSL modem that
was also doing NAT -- TCP connections frequently stall, disconnect, etc. 
Using the Linksys router to bridge the wired and wireless networks, and
avoiding network address translation, really made a difference. 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Network Associates Laboratories