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Date: Mon, 23 Jul 2012 06:55:19 +0200
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From: "Herbert J. Skuhra" <h.skuhra@gmail.com>
To: freebsd-questions@freebsd.org
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On Sat, 21 Jul 2012 16:10:56 +0200
"Herbert J. Skuhra" <h.skuhra@gmail.com> wrote:

> On Sat, Jul 21, 2012 at 11:24 AM, Herbert J. Skuhra <h.skuhra@gmail.com> wrote:
> > Hi,
> >
> > ok, this is obviously a pf problem and the reason why the network in
> > the jail doesn't work.
> >
> > ifconfig lo1 create
> > ifconfig lo1 10.0.0.10 netmask 0xffffff00
> > nc -s 10.0.0.10 xx.xx.xx.xx 25
> >
> > With pf: connections fails; server receives SYN-ACK, but nc continues
> > sending SYNs until nc gives up
> >
> > With ipfw: connection OK
> >
> > On my Soekris box at home (9.1-PRERELEASE i386) both ipfw and pf works.
> 
> Could this be a bug in the fxp driver?
> I have a 2nd machine with a fxp nic. Same problem.

Thanks to yongari@ the issue could be resolved on both machines by
disabling receive checksum offloading (ifconfig fxp0 -rxsum).

-- 
Herbert