Significant network latency when using ipfw and in-kernel NAT

[Soren Dreijer]

Can anybody confirm that disabling these other options (rxcsum,
txcsum, vlanmtu, vlanhwtag, vlanhwfilter, vlanhwtso) won't cause my
adapter to lose its connectivity? This is a server in production and
I'd rather not cause an outage if I can prevent it. :)

On Fri, Sep 14, 2012 at 12:00 AM, Ian Smith <smithi at nimnet.asn.au> wrote:
> On Thu, 13 Sep 2012 12:37:23 -0500, Soren Dreijer wrote:
>      [Luigi Rizzo wrote:]
>  > > i'd start by disabling all accelerations (and jumobgrams)
>  > > and then move on from the results to figure out where is the problem.
>  >
>  > So, I went ahead and disabled TSO on ix0. That seemed to fix the
>  > intermittent connection issues I had been experiencing with keeping an
>  > XMPP connection alive to one of our internal boxes. It hasn't done
>  > anything for the ICMPs or TCP traffic originating from the FreeBSD
>  > box, of course.
>
> Please show ifconfig for ix0 and ix1 again after disabling tso,
> rxcsum, txcsum, vlanmtu, vlanhwtag, vlanhwfilter, vlanhwtso
> and any other configured accelerations, as Luigi recommended?
>
> Then we'd know if your problem was related to any of that, or not.
>
> cheers, Ian