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Working around lack of router settings
(lemm.ee)
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this post was submitted on 04 Mar 2024
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I use my own router with DD-WRT in-between the ISPs router/modem and my LAN, and use a different subnet. I haven't had any issues with this myself, and my router just sees the ISP router/modem as the WAN.
Normally this is bad advice, but if you already have CGNAT you'd be going from double NAT to triple NAT and it probably won't make anything worse. At least it shouldn't make things worse for IPv4. If you have 5G internet with CGNAT there's no excuse for your ISP not giving you proper IPv6. Putting a second router between will complicate your IPv6 setup.
There are some tricks you can do for IPv4 in the precense of hostile DHCP servers. Serious OSes should allow you to configure a second IP address on the same physical interface, so you could have a dynamic 192.168.0.x assigned by the ISP's DHCP server and a static 192.168.1.y assigned statically by you, and then you should be able to set up an additional route table entry to access 192.168.1.0/24 using the source address 192.168.1.y. As long as the ethernet/wifi switching between devices doesn't filter ARP packets based on IP subnet, you should be able to communicate between your machines using fixed IPs on the second subnet.
Triple NAT? Would that cause any problems?
Unlikely. The main issue comes with port forwarding, but you are locked out from doing that already. I say go for the triple NAT, put your own router after the ISP's modem and then you have full control of your LAN.
Yes, but probably no additional problems if you’re already behind CGNAT.
Not really for most applications