[anti-censorship-team] configure router NAT for snowflake proxy

[meskio]

Hello,

I thought I could host a snowflake standalone proxy in my home fiber. Following 
the instructions[0] it says that is "especially recommended":

> A full-cone NAT (you can use this NAT behaviour tool to test what type of NAT 
> you have. The properties you are looking for are address-independent mapping 
> and either address-independent or address-dependent filtering)

Using the "NAT behaviour tool" I get:
* NAT mapping behavior: endpoint independent (good)
* NAT filtering behavior: address and port dependent (bad)

My home router is an openwrt on which I have total control, it gets the public 
IP from my ISP and provides NAT to my home network. I tried playing a bit with 
the NAT Rules and the firewall settings, but all that is magic for me. Any tips 
how to fix the NAT filtering in openwrt or what do I need to look into iptables 
for it?

Thanks.

[0] https://community.torproject.org/relay/setup/snowflake/standalone/

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