default gateway not working on usb0

[b-trav]

Hi Robert,

Thanks for your work.

I am playing around with the PocketBeagle. I am ssh'ing over usb0, and at the moment I have to type:

sudo ip route add default via 192.168.7.1
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf

in order to get internet access on the PocketBeagle. This is despite my /etc/network/interfaces file containing:

iface usb0 inet static
    address 192.168.7.2
    netmask 255.255.255.0
    gateway 192.168.7.1
    dns-nameservers 8.8.8.8

I can get around the resolv.conf issue by disabling connman:

sudo systemctl disable connman.service

but cannot figure out how to set the default gateway. I am guessing the problem is with autoconfigure_usb0.sh?

Any suggestions would be greatly appreciated.

Thanks,

Ben

[timburgess]

The /etc/network/interfaces file is parsed by the autoconfigure_usb0.sh script in /opt/scripts/boot

Looking at that script, although it looks for the gateway value, it doesn't seem to do actually do much with it. Using the current Debian stretch image, doing a ip route show after boot reports:

192.168.6.0/30 dev usb1 proto kernel scope link src 192.168.6.2 
192.168.7.0/30 dev usb0 proto kernel scope link src 192.168.7.2

If I add a route add default gw 192.168.7.1 as the last command in the final if statement in autoconfigure_usb0.sh, then after boot, I get:

default via 192.168.7.1 dev usb0
192.168.6.0/30 dev usb1 proto kernel scope link src 192.168.6.2 
192.168.7.0/30 dev usb0 proto kernel scope link src 192.168.7.2

and a working network route via my laptop.

For the record, on my linux laptop I'm forwarding from usb to wifi with:

sudo sysctl net.ipv4.ip_forward=1
sudo iptables --table nat --append POSTROUTING --out-interface wlp4s0 -j MASQUERADE
sudo iptables --append FORWARD --in-interface enx985dad314e0d -j ACCEPT

[RobertCNelson]

Sadly it's not well documented, but there are some helper scripts here:

https://github.com/RobertCNelson/boot-scripts/tree/master/network

(/opt/scripts/network/)

Regards,