Sharing internet to USB gadget via RDNIS

taspen · 05-24-2024, 03:38 PM

As much as I love linux, I hate linux networking. I have a MilkV-Duo which is a little RISCV dev board that connects to my computer via RDNIS as a USB gadet. Then you can ssh into it. I need to be able to get this board online with full access to the internet by sharing my laptops wifi. What I'm looking for is a simple way to do get it done. I've used nftables once on my server but that was a year ago and I havn't touched it since. My laptop is using iptables-nft or UFW and it says not to edit the nftables anyway. After getting lost in iptables I installed UFW hoping it would be straight forward. Is UFW a good approch to avoid getting elbows deep into iptables/nftable? With the routes I added below I can ping my laptop at the wifi card IP (192.168.0.122) but I can't ping my wifi router (192.168.0.1) or anywhere beond that from the Duo.

I set these UFW rules on my laptop . (debian)
```
Status: active

To Action From
-- ------ ----
[ 1] Anywhere on wlp2s0 ALLOW FWD Anywhere on enx3eebd35d9958
[ 2] Anywhere on enx3eebd35d9958 ALLOW FWD Anywhere on wlp2s0
[ 3] Anywhere (v6) on wlp2s0 ALLOW FWD Anywhere (v6) on enx3eebd35d9958
[ 4] Anywhere (v6) on enx3eebd35d9958 ALLOW FWD Anywhere (v6) on wlp2s0
```

On the Duo

```
[root@milkv-duo]~# ip route
default dev eth0 scope link src 169.254.93.130 metric 1001002
169.254.0.0/16 dev eth0 scope link src 169.254.93.130 metric 1002
192.168.0.1 via 192.168.0.122 dev eth0
192.168.0.122 via 192.168.42.1 dev usb0
192.168.42.0/24 dev usb0 scope link src 192.168.42.1
192.168.42.1 via 192.168.0.122 dev eth0
```

smallpond · 06-06-2024, 03:04 PM

Doesn't debian use NetworkManager? I set this up for home office equipment during the pandemic using nmcli.

I created a connection called office and share the wi-fi to it. For me the commands were:

Code:

nmcli connection add type ethernet ifname eno2 ipv4.method shared con-name office
nmcli connection up office
nmcli connection modify office ipv4.addresses 192.168.42.1/24
nmcli connection up office

I had to modify the IP because the one NM chose conflicted with my remote work. Maybe they used NM also. I used dnsmasq to provide DHCP and DNS to my office subnet 192.168.42.x but you can use a static IP and 8.8.8.8 or whatever if you prefer.

NM takes care of adjusting firewall rules correctly.