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

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
websssCEOAsked:
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PerarduaadastraCommented:
Can you configure the ISP's device as a bridge and connect its output to the WAN port on your Asus router? I presume that the Asus can handle any authentication requirements that your ISP may have...

If so, and you've already been using it to share the internet, there shouldn't be much else to do, as only the presentation of the internet to the router will have changed.

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Fred MarshallPrincipalCommented:
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
websssCEOAuthor Commented:
the isp configured the rubbish router as a bridge and works great now!!!
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