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Generally you can port forward through two levels of NAT. &nbsp;But perhaps not IPSEC connections depending on how they are implemented.<br />
<br />
So, I would likely just leave the ISP router alone and connect the ASUS router behind it.<br />
<a href="https://filedb.experts-exchange.com/incoming/2012/03_w13/564585/Multiple-Subnets.pdf" target="_blank" class="file-inline" title="Multiple subnet layers... (11 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Multiple-Subnets.pdf</a>
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Generally you can port forward through two levels of NAT.  But perhaps not IPSEC connections depending on how they are implemented.

So, I would likely just leave the ISP router alone and connect the ASUS router behind it.
Multiple-Subnets.pdf [https://filedb.experts-exchange.com/incoming/2012/03_w13/564585/Multiple-Subnets.pdf]

Multiple-Subnets.pdf

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the isp configured the rubbish router as a bridge and works great now!!!
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the isp configured the rubbish router as a bridge and works great now!!!

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<div class="content wysiwyg-content">
I have just had fibre installed <br />
<br />
My clever asus router running aftermarket firmware doesn't have a fibre optic input so I want to use the crappy cheap one provided by the ISP for Internet, and turn off everything else (wifi etc)<br />
<br />
I then want to plug an Ethernet cable into the wan port on the asus router and use this to share my Internet with house mates/ setup port forwarding<br />
<br />
However I need some advice on how to do this<br />
Ideally what sort of ip addresses to configure on each device and if any port forwarding issues will be present, or can I just configure the asus like a normal router?<br />
<br />
Any advice appreciated<br />
Thanks
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I have just had fibre installed 

My clever asus router running aftermarket firmware doesn't have a fibre optic input so I want to use the crappy cheap one provided by the ISP for Internet, and turn off everything else (wifi etc)

I then want to plug an Ethernet cable into the wan port on the asus router and use this to share my Internet with house mates/ setup port forwarding

However I need some advice on how to do this
Ideally what sort of ip addresses to configure on each device and if any port forwarding issues will be present, or can I just configure the asus like a normal router?

Any advice appreciated
Thanks

2 routers - use 2nd for config and 1st for plain Internet?

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Wireless networking is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Wireless telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure. The key hardware components of a wireless computer network include adapters, routers and access points, antennas and repeaters.

Wireless Hardware

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.