Date: Thu, 9 Jun 2016 16:06:01 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Kristof Provost <kp@FreeBSD.org> Cc: stable@freebsd.org, freebsd-net@freebsd.org Subject: Re: ipfw fwd to closed port Message-ID: <20160609130601.GS75630@zxy.spb.ru> In-Reply-To: <20160609130017.GA4071@vega.codepro.be> References: <20160608230240.GA51364@zxy.spb.ru> <20160609130017.GA4071@vega.codepro.be>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Jun 09, 2016 at 03:00:17PM +0200, Kristof Provost wrote:
> On 2016-06-09 02:02:40 (+0300), Slawa Olhovchenkov <slw@zxy.spb.ru> wrote:
> > Forwarding by ipfw to closed local port generating RST packet with
> > incorrect checksun. Is this know ussuse? Need open PR?
>
> Where did you capture the packet? If you've captured the packet on the
> machine that generated it tcpdump may indeed claim that the checksum is
> wrong, because it's computed by the hardware (so after tcpdump captured
> it).
On the tun0 (destination of RST packet routed to tun0).
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
inet 192.168.4.1 --> 192.168.4.1 netmask 0xffffff00
inet6 fe80::240:63ff:fedc:ac9e%tun0 prefixlen 64 scopeid 0x9
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
Opened by PID 1345
tun0 don't computed checksum.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20160609130601.GS75630>