Date: Sat, 07 Apr 2018 18:01:13 +0300 From: wishmaster <artemrts@ukr.net> To: ml@netfence.it Cc: freebsd-net@freebsd.org Subject: Re[2]: Questions about ipfw's dynamic rules' dyn_keepalive Message-ID: <1523113095.663460514.l5y2tucy@frv52.fwdcdn.com> In-Reply-To: <07ab14c5-466d-2d7e-9447-6b7d1e9bd823@netfence.it> References: <04ad23ad-4020-7c07-8d75-eef6e84f4de8@netfence.it> <756b78e2-4e65-ab03-1e91-943a77fdf45d@yandex.ru> <25e56a77-8374-d273-0b5e-2f11c1b03ff8@yandex.ru> <07ab14c5-466d-2d7e-9447-6b7d1e9bd823@netfence.it>
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--- Original Message --- From: "Andrea Venturoli" Date: 7 April 2018, 17:19:00 > On 04/03/18 12:54, Andrey V. Elsukov wrote: > > On 03.04.2018 13:45, Andrey V. Elsukov wrote: > >>> Can anybody give any hint about the above behaviours or point me to good > >>> documentation? The man pages is very brief on this, unfortunately. > >> > >> Hi, > > Thanks for your answer. > > > > >> ipfw uses M_SKIP_FIREWALL flag for self-generated packets. Thus > >> keep-alive packets are sent bypass the rules. When you use NAT, I guess > >> keep-alive packets have private source address, because they are not go > >> through the NAT rule. And because of this remote host drops them without > >> reply. > > If this is the reason, since I run tcpdump on the client (internal > network) I should have seen them arriving, shouldn't I? > > > > > You can try this patch: > > > > https://people.freebsd.org/~ae/ipfw_bypass_own_packets11.diff > > > > It adds sysctl variable net.inet.ip.fw.bypass_own_packets, that can > > control the behavior of M_SKIP_FIREWALL flag. > > It seems this is a patch against HEAD and it doesn't apply cleanly to > 11.1R. Unfortunately the file it modifies seems to have changed a lot > and I don't know how to adapt this. > > Is there a plan to get this patch in the source in the future? > If not, why? Are there any disadvantages? I have tested this patch (with some modifications) and with this patch ipfw works as expected for users behind NAT without any side effects. --- Vitaly
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