Help route internet from usb tether to lan - nat, routes & nftables

Im using armbian server edition. Im trying to setup my box to route internet from end0 (192.168.1.6) to internet on usb0 (dhcp). Im running dns & dhcp via docker adguard - but assume thats not working for now because once the nftable rules are applied I cannot access their web interfaces. But for now ping with ip is okay.

With my current setup I can ping the internet from the 'router' via the interface usb0. But I cannot ping from the interface end0.

ping 8.8.8.8 -I usb0 <- works

ping 8.8.8.8 -I end0 <- Destination Host Unreachable

Do I need to setup any static routes? Or should nftables handle all the routing?

Ive tried several guides with various nftable rules, but none of them work:

https://peppe8o.com/raspberry-pi-portable-hotspot-with-android-usb-tethering/

https://oxcrag.net/projects/linux-router-part-1-routing-nat-and-nftables/

https://wiki.nftables.org/wiki-nftables/index.php/Simple_ruleset_for_a_home_router

my network config:

usb0:
[Match]
Name=usb0

[Network]
DHCP=yes


end0:
[Match]
Name=end0

[Network]
Address=192.168.1.6/24

my nftables:

table inet filter {
        chain input {
                type filter hook input priority filter; policy accept;
        }

        chain forward {
                type filter hook forward priority filter; policy accept;
                iif "end0" oif "usb0" accept
                iif "usb0" oif "end0" accept
        }

        chain output {
                type filter hook output priority filter; policy accept;
        }
}
table ip nat {
        chain prerouting {
                type nat hook prerouting priority filter; policy accept;
        }

        chain postrouting {
                type nat hook postrouting priority srcnat; policy accept;
                oif "usb0" masquerade
        }
}

my routes:

default via 192.168.102.208 dev usb0 
default via 192.168.102.208 dev usb0 proto dhcp src 192.168.102.114 metric 1024 
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown <- docker?
172.18.0.0/16 dev br-cc00a7d88795 proto kernel scope link src 172.18.0.1 <- docker?
192.168.1.0/24 dev end0 proto kernel scope link src 192.168.1.6 
192.168.102.0/24 dev usb0 proto kernel scope link src 192.168.102.114 metric 1024 
192.168.102.208 dev usb0 proto dhcp scope link src 192.168.102.114 metric 1024 

Edited November 20, 20241 yr by Gibbz