@Uk Sentinel Could you please have look on this guide and see if HG612 configured as per instruction from link will work on one cable with asus router configured “your” way.
The iptables etc. look good but I would not approve this usage (my moto is) ‘KIS’ keep-it-simple -this could leave the modem open to exploitation, 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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