Thanks for good point - nf_conntrack_helper was disabled by default and it
is difference between jessie and stretch
When I enable it - pptp from local network is working:

echo 1 > /proc/sys/net/netfilter/nf_conntrack_helper

On Thu, Aug 10, 2017 at 2:59 PM, Thierry JAOUEN <thie...@tjaouen.fr> wrote:

> Hi,
>
> Maybe you need the "helper" module ?
>
> <https://home.regit.org/netfilter-en/secure-use-of-helpers/>
> <http://www.spinics.net/lists/netfilter/msg11791.html>
>
> ... -m helper --helper pptp ...
>
>
> Bye
>
>
>
> Le 10/08/2017 à 12:04, Alexey Kurinnij a écrit :
>
>> Hi. I have debian box with nat as gateway.
>> With debbian jessie pptp from local network worked, with loaded kernel
>> module ip_nat_pptp.
>> After upgrade to debian stretch - pptp not working any more, module
>> ip_nat_pptp loaded.
>> Anyone have similar working configuration?
>>
>> # Generated by iptables-save v1.6.0 on Thu Aug 10 13:04:00 2017
>> *filter
>> :INPUT ACCEPT [0:0]
>> :FORWARD ACCEPT [0:0]
>> :OUTPUT ACCEPT [0:0]
>> -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
>> -A INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
>> -A INPUT -i lo -j ACCEPT
>> -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
>> -A INPUT -i eth0 -p udp -m state --state NEW -m udp --dport 67 -j ACCEPT
>> -A INPUT -j DROP
>> -A FORWARD -s 192.168.1.0/24 ! -d 192.168.1.0/24 -i eth0 -j ACCEPT
>> -A FORWARD -d 192.168.1.0/24 -i eth1 -j ACCEPT
>> -A FORWARD -j DROP
>> -A OUTPUT -j ACCEPT
>> COMMIT
>> # Completed on Thu Aug 10 13:04:00 2017
>> # Generated by iptables-save v1.6.0 on Thu Aug 10 13:04:00 2017
>> *nat
>> :PREROUTING ACCEPT [8403:561775]
>> :INPUT ACCEPT [4:194]
>> :OUTPUT ACCEPT [295:18031]
>> :POSTROUTING ACCEPT [295:18031]
>> -A PREROUTING -i eth1 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 22
>> -A POSTROUTING -s 192.168.1.0/24 -o eth1 -j MASQUERADE
>> COMMIT
>> # Completed on Thu Aug 10 13:04:00 2017
>>
>>
>

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